Module 1 DS324EE – DataStage Enterprise Edition Concept Review.
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Transcript of Module 1 DS324EE – DataStage Enterprise Edition Concept Review.
![Page 1: Module 1 DS324EE – DataStage Enterprise Edition Concept Review.](https://reader035.fdocuments.us/reader035/viewer/2022062306/56649e0f5503460f94afa922/html5/thumbnails/1.jpg)
Module 1
DS324EE – DataStage Enterprise Edition
Concept Review
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Ascential’s Enterprise Data Integration Platform
CRMERPSCM
RDBMSLegacy
Real-time Client-server Web services
Data WarehouseOther apps.
ANY SOURCE
ANY TARGET
CRMERPSCMBI/AnalyticsRDBMSReal-time Client-server Web servicesData WarehouseOther apps.
Command & Control
DISCOVERDISCOVER
Gather relevant information for target enterprise applications
Data Profiling
PREPAREPREPARE
Data Quality
Cleanse, correct and match input data
TRANSFORMTRANSFORM
Extract, Transform,
Load
Standardize and enrich data and load to targets
Meta Data Management
Parallel Execution
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Course Objectives
You will learn to:– Build DataStage EE jobs using complex logic– Utilize parallel processing techniques to increase job
performance– Build custom stages based on application needs
Course emphasis is:– Advanced usage of DataStage EE– Application job development– Best practices techniques
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Course Agenda
Day 1– Review of EE Concepts– Sequential Access– Standards– DBMS Access
Day 2– EE Architecture– Transforming Data– Sorting Data
Day 3– Combining Data– Configuration Files
Day 4– Extending EE– Meta Data Usage– Job Control– Testing
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Module Objectives
Provide a background for completing work in the DSEE advanced course
Ensure all students will have a successful advanced class
Tasks– Review parallel processing concepts
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Review Topics
DataStage architecture
DataStage client review– Administrator– Manager– Designer– Director
Parallel processing paradigm
DataStage Enterprise Edition
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Microsoft® Windows NT or UNIX
Designer DirectorRepository
ManagerAdministrator
Extract Cleanse Transform IntegrateDiscover Prepare Transform Extend
Parallel Execution
Meta Data Management
Command & Control
Microsoft® Windows NT/2000/XP
ANY SOURCE
ANY TARGET
CRMERPSCMBI/AnalyticsRDBMSReal-Time Client-server Web servicesData WarehouseOther apps.
Server Repository
Client-Server Architecture
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Process Flow
Administrator – add/delete projects, set defaults
Manager – import meta data, backup projects
Designer – assemble jobs, compile, and execute
Director – execute jobs, examine job run logs
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Administrator – Licensing and Timeout
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Administrator – Project Creation/Removal
Functions specific to a
project.
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Administrator – Project Properties
RCP for parallel jobs should be
enabled
Variables for parallel
processing
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Administrator – Environment Variables
Variables are category specific
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OSH is what is run by the EE Framework
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DataStage Manager
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Export Objects to MetaStage
Push meta data to
MetaStage
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Designer Workspace
Can execute the job from
Designer
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DataStage Generated OSH
The EE Framework runs OSH
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Director – Executing Jobs
Messages from previous run in different color
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Stages
Can now customize the Designer’s palette
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Popular Stages
Row generator
Peek
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Row Generator
Can build test data
Repeatable property
Edit row in column tab
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Peek
Displays field values– Will be displayed in job log or sent to a file– Skip records option– Can control number of records to be displayed
Can be used as stub stage for iterative development (more later)
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Why EE is so Effective
Parallel processing paradigm– More hardware, faster processing– Level of parallelization is determined by a configuration
file read at runtime
Emphasis on memory– Data read into memory and lookups performed like
hash table
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Parallel processing = executing your application on multiple CPUs– Scalable processing = add more resources
(CPUs, RAM, and disks) to increase system performance
• Example system containing6 CPUs (or processing nodes)and disks
1 2
3 4
5 6
Scalable Systems
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Three main types of scalable systems
Symmetric Multiprocessors (SMP), shared memory
Clusters: UNIX systems connected via networks
MPP
note
Scaleable Systems: Examples
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• Multiple CPUs with a single operating system• Programs communicate using shared memory• All CPUs share system resources
(OS, memory with single linear address space, disks, I/O)
When used with enterprise edition:• Data transport uses shared memory• Simplified startup
cpu cpu
cpu cpu
enterprise edition treats NUMA (NonUniform Memory Access) as SMP
SMP: Shared Everything
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Source
Transform
Target
Data Warehouse
Operational Data
Archived Data
Clean Load
Disk Disk Disk
Traditional approach to batch processing:• Write to disk and read from disk before each processing operation• Sub-optimal utilization of resources
• a 10 GB stream leads to 70 GB of I/O• processing resources can sit idle during I/O
• Very complex to manage (lots and lots of small jobs)• Becomes impractical with big data volumes
• disk I/O consumes the processing• terabytes of disk required for temporary staging
Traditional Batch Processing
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Data Pipelining• Transform, clean and load processes are executing simultaneously on the same processor• rows are moving forward through the flow
Source
Transform
Target
Data Warehouse
Operational Data
Archived Data Clean Load
• Start a downstream process while an upstream process is still running.• This eliminates intermediate storing to disk, which is critical for big data.• This also keeps the processors busy.• Still has limits on scalability
Think of a conveyor belt moving the rows from process to process!
Pipeline Multiprocessing
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Data Partitioning
Transform
SourceData
Transform
Transform
Transform
Node 1
Node 2
Node 3
Node 4
A-F
G- M
N-T
U-Z
• Break up big data into partitions
• Run one partition on each processor
• 4X times faster on 4 processors - With data big enough: 100X faster on 100 processors
• This is exactly how the parallel databases work!
• Data Partitioning requires the same transform to all partitions: Aaron Abbott and Zygmund Zorn undergo the same transform
Partition Parallelism
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Putting It All Together: Parallel Dataflow
Source Target
Transform Clean Load
Pipelining
Par
titio
ning
SourceData
Data Warehouse
Combining Parallelism Types
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• Dataset: uniform set of rows in the Framework's internal representation - Three flavors: 1. file sets *.fs : stored on multiple Unix files as flat files 2. persistent: *.ds : stored on multiple Unix files in Framework
format read and written using the DataSet Stage
3. virtual: *.v : links, in Framework format, NOT stored on disk - The Framework processes only datasets—hence possible need for
Import - Different datasets typically have different schemas- Convention: "dataset" = Framework data set.
• Partition: subset of rows in a dataset earmarked for processing by the same node (virtual CPU, declared in a configuration file).
- All the partitions of a dataset follow the same schema: that of the dataset
EE Program Elements
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Putting It All Together: Parallel Dataflow with Repartioning on-the-fly
Without Landing To Disk!
Source Target
Transform Clean Load
Pipelining
SourceData Data
Warehouse
Par
titio
ning
Rep
artit
ioni
ng
A-FG- M
N-TU-Z
Customer last name Customer zip code Credit card number
Rep
artit
ioni
ng
Repartitioning
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Orchestrate Program(sequential data flow)
Orchestrate Application Frameworkand Runtime System
Import
Clean 1
Clean 2
Merge Analyze
Configuration File
Centralized Error Handlingand Event Logging
Parallel access to data in files
Parallel access to data in RDBMS
Inter-node communications
Parallel pipelining
Parallelization of operations
Import
Clean 1
Merge Analyze
Clean 2
Relational Data
PerformanceVisualization
Flat Files
Orchestrate Framework:Provides parallel processing
DataStage Enterprise Edition:Best-of-breed scalable data integration platformNo limitations on data volumes or throughput
DataStage EE Architecture
DataStage Engine:Provides data integration platform
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DSEE:– Automatically scales to fit the machine– Handles data flow among multiple CPU’s and disks
With DSEE you can:– Create applications for SMP’s, clusters and MPP’s…
enterprise edition is architecture-neutral– Access relational databases in parallel– Execute external applications in parallel– Store data across multiple disks and nodes
Introduction to DataStage EE
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User assembles the flow using the DataStage Designer:
…and gets: parallel access, propagation, transformation, and load. The design is good for 1 node, 4 nodes,
or N nodes. To change # nodes, just swap configuration file. No need to modify or recompile your design!
Job Design VS. Execution
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Partitioners distribute rows into partitions– implement data-partition parallelism
Collectors = inverse partitioners
Live on input links of stages running – in parallel (partitioners)– sequentially (collectors)
Use a choice of methods
Partitioners and Collectors
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Example Partitioning Icons
partitioner
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Exercise
Complete exercises 1-1 and 1-2, and 1-3
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Module 2
DSEE Sequential Access
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Module Objectives
You will learn to:– Import sequential files into the EE Framework– Utilize parallel processing techniques to increase
sequential file access– Understand usage of the Sequential, DataSet, FileSet,
and LookupFileSet stages– Manage partitioned data stored by the Framework
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Types of Sequential Data Stages
Sequential– Fixed or variable length
File Set
Lookup File Set
Data Set
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The EE Framework processes only datasets
For files other than datasets, such as flat files, enterprise edition must perform import and export operations – this is performed by import and export OSH operators (generated by Sequential or FileSet stages)
During import or export DataStage performs format translations – into, or out of, the EE internal format
Data is described to the Framework in a schema
Sequential Stage Introduction
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How the Sequential Stage Works
Generates Import/Export operators
Types of transport– Performs direct C++ file I/O streams– Source programs which feed stdout (gunzip) send
stdout into EE via sequential pipe
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Using the Sequential File Stage
Importing/Exporting Data
Both import and export of general files (text, binary) are performed by the SequentialFile Stage.
– Data import:
– Data export
EE internal format
EE internal format
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Working With Flat Files
Sequential File Stage– Normally will execute in sequential mode– Can execute in parallel if reading multiple files (file
pattern option)– Can use multiple readers within a node on fixed width
file– DSEE needs to know
How file is divided into rowsHow row is divided into columns
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Processes Needed to Import Data
Recordization– Divides input stream into records– Set on the format tab
Columnization– Divides the record into columns– Default set on the format tab but can be overridden on
the columns tab– Can be “incomplete” if using a schema or not even
specified in the stage if using RCP
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File Format Example
Fie ld 1
F ie ld 1
F ie ld 1
F ie ld 1
F ie ld 1
F ie ld 1
,
,
,
,
,
,
Last fie ld
Last fie ld
n l
n l,
F ie ld D e lim ite r
F in a l D e lim ite r = c o m m a
F in a l D e lim ite r = e n d
R e co rd d e lim ite r
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Sequential File Stage
To set the properties, use stage editor– Page (general, input/output)– Tabs (format, columns)
Sequential stage link rules– One input link– One output links (except for reject link definition)– One reject link
Will reject any records not matching meta data in the column definitions
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Job Design Using Sequential Stages
Stage categories
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General Tab – Sequential Source
Multiple output links Show records
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Properties – Multiple Files
Click to add more files having the same meta data.
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Properties - Multiple Readers
Multiple readers option allows you to set number of readers
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Format Tab
File into records Record into columns
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Read Methods
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Reject Link
Reject mode = output
Source– All records not matching the meta data (the column
definitions)
Target– All records that are rejected for any reason
Meta data – one column, datatype = raw
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File Set Stage
Can read or write file sets
Files suffixed by .fs
File set consists of:1. Descriptor file – contains location of raw data files +
meta data
2. Individual raw data files
Can be processed in parallel
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File Set Stage Example
Descriptor file
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File Set Usage
Why use a file set?– 2G limit on some file systems– Need to distribute data among nodes to prevent
overruns– If used in parallel, runs faster that sequential file
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Lookup File Set Stage
Can create file sets
Usually used in conjunction with Lookup stages
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Lookup File Set > Properties
Key column specified
Key column dropped in
descriptor file
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Data Set
Operating system (Framework) file
Suffixed by .ds
Referred to by a control file
Managed by Data Set Management utility from GUI (Manager, Designer, Director)
Represents persistent data
Key to good performance in set of linked jobs
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Persistent Datasets
Accessed from/to disk with DataSet Stage.
Two parts: – Descriptor file:
contains metadata, data location, but NOT the data itself
– Data file(s) contain the data multiple Unix files (one per node), accessible in parallel
input.ds
node1:/local/disk1/…node2:/local/disk2/…
record ( partno: int32; description: string; )
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Quiz!
• True or False?Everything that has been data-partitioned must be
collected in same job
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Data Set Stage
Is the data partitioned?
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Engine Data Translation
Occurs on import– From sequential files or file sets– From RDBMS
Occurs on export– From datasets to file sets or sequential files– From datasets to RDBMS
Engine most efficient when processing internally formatted records (I.e. data contained in datasets)
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Managing DataSets
GUI (Manager, Designer, Director) – tools > data set management
Alternative methods – Orchadmin
Unix command line utilityList recordsRemove data sets (will remove all components)
– DsrecordsLists number of records in a dataset
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Data Set Management
Display data
Schema
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Data Set Management From Unix
Alternative method of managing file sets and data sets– Dsrecords
Gives record count– Unix command-line utility
– $ dsrecords ds_name
I.e.. $ dsrecords myDS.ds156999 records
– Orchadmin Manages EE persistent data sets
– Unix command-line utility
I.e. $ orchadmin rm myDataSet.ds
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Exercise
Complete exercises 2-1, 2-2, 2-3, and 2-4.
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Blank
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Module 3
Standards and Techniques
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Objectives
Establish standard techniques for DSEE development
Will cover:– Job documentation– Naming conventions for jobs, links, and stages– Iterative job design– Useful stages for job development – Using configuration files for development– Using environmental variables– Job parameters
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Job Presentation
Document using the annotation stage
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Job Properties Documentation
Description shows in DS Manager and MetaStage
Organize jobs into categories
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Naming conventions
Stages named after the – Data they access– Function they perform– DO NOT leave defaulted stage names like
Sequential_File_0
Links named for the data they carry– DO NOT leave defaulted link names like DSLink3
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Stage and Link Names
Stages and links renamed to data they
handle
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Create Reusable Job Components
Use enterprise edition shared containers when feasible
Container
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Use Iterative Job Design
Use copy or peek stage as stub
Test job in phases – small first, then increasing in complexity
Use Peek stage to examine records
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Copy or Peek Stage Stub
Copy stage
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Transformer StageTechniques
Suggestions -– Always include reject link.– Always test for null value before using a column in a
function. – Try to use RCP and only map columns that have a
derivation other than a copy. More on RCP later.– Be aware of Column and Stage variable Data Types.
Often user does not pay attention to Stage Variable type.
– Avoid type conversions.Try to maintain the data type as imported.
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The Copy Stage
With 1 link in, 1 link out:
the Copy Stage is the ultimate "no-op" (place-holder): – Partitioners– Sort / Remove Duplicates– Rename, Drop column
… can be inserted on: – input link (Partitioning): Partitioners, Sort, Remove Duplicates)– output link (Mapping page): Rename, Drop.
Sometimes replace the transformer:– Rename,– Drop, – Implicit type Conversions– Link Constraint – break up schema
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Developing Jobs
1. Keep it simple• Jobs with many stages are hard to debug and maintain.
2. Start small and Build to final Solution• Use view data, copy, and peek. • Start from source and work out.• Develop with a 1 node configuration file.
3. Solve the business problem before the performance problem.• Don’t worry too much about partitioning until the sequential flow
works as expected.
4. If you have to write to Disk use a Persistent Data set.
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Final Result
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Good Things to Have in each Job
Use job parameters
Some helpful environmental variables to add to job parameters– $APT_DUMP_SCORE
Report OSH to message log
– $APT_CONFIG_FILEEstablishes runtime parameters to EE engine; I.e. Degree of
parallelization
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Setting Job Parameters
Click to add environment
variables
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DUMP SCORE Output
Double-click
Mapping Node--> partition
Setting APT_DUMP_SCORE yields:
PartitonerAnd
Collector
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Use Multiple Configuration Files
Make a set for 1X, 2X,….
Use different ones for test versus production
Include as a parameter in each job
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Exercise
Complete exercise 3-1
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Module 4
DBMS Access
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Objectives
Understand how DSEE reads and writes records to an RDBMS
Understand how to handle nulls on DBMS lookup
Utilize this knowledge to:– Read and write database tables– Use database tables to lookup data– Use null handling options to clean data
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Parallel Database Connectivity
TraditionalTraditionalClient-ServerClient-Server enterprise editionenterprise edition
SortSort
ClientClient
Parallel RDBMSParallel RDBMS
ClientClient
ClientClient
ClientClient
ClientClient
Parallel RDBMSParallel RDBMS
Only RDBMS is running in parallel Each application has only one connection Suitable only for small data volumes
Parallel server runs APPLICATIONS Application has parallel connections to RDBMS Suitable for large data volumes Higher levels of integration possible
ClientClient
LoadLoad
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RDBMS AccessSupported Databases
enterprise edition provides high performance / scalable interfaces for:
DB2
Informix
Oracle
Teradata
Users must be granted specific privileges, depending on RDBMS.
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Automatically convert RDBMS table layouts to/from enterprise edition Table Definitions
RDBMS nulls converted to/from nullable field values
Support for standard SQL syntax for specifying:– field list for SELECT statement– filter for WHERE clause– open command, close command
Can write an explicit SQL query to access RDBMS EE supplies additional information in the SQL query
RDBMS AccessSupported Databases
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RDBMS Stages
DB2/UDB Enterprise
Informix Enterprise
Oracle Enterprise
Teradata Enterprise
ODBC
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RDBMS Usage
As a source– Extract data from table (stream link)
– Extract as table, generated SQL, or user-defined SQL
– User-defined can perform joins, access views
– Lookup (reference link)– Normal lookup is memory-based (all table data read into memory)
– Can perform one lookup at a time in DBMS (sparse option)
– Continue/drop/fail options
As a target– Inserts– Upserts (Inserts and updates)– Loader
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RDBMS Source – Stream Link
Stream link
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DBMS Source - User-defined SQL
Columns in SQL statement must match the meta data
in columns tab
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Exercise
User-defined SQL– Exercise 4-1
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DBMS Source – Reference Link
Reject link
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Lookup Reject Link
“Output” option automatically creates the reject link
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Null Handling
Must handle null condition if lookup record is not found and “continue” option is chosen
Can be done in a transformer stage
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Lookup Stage Mapping
Link name
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Lookup Stage Properties
Reference link
Must have same column name in input and reference links. You will get the results of the lookup
in the output column.
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DBMS as a Target
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DBMS As Target
Write Methods– Delete– Load– Upsert– Write (DB2)
Write mode for load method– Truncate– Create– Replace– Append
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Target Properties
Upsert mode determines options
Generated code can be copied
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Checking for Nulls
Use Transformer stage to test for fields with null values (Use IsNull functions)
In Transformer, can reject or load default value
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Exercise
Complete exercise 4-2
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Module 5
Platform Architecture
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Objectives
Understand how enterprise edition Framework processes data
You will be able to:– Read and understand OSH– Perform troubleshooting
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Concepts
The EE Platform
OSH (generated by DataStage Parallel Canvas, and run by DataStage Director)
Conductor,Section leaders,players.
Configuration files (only one active at a time, describes H/W)
Schemas/tables
Schema propagation/RCP
Buildop,Wrapper
Datasets (data in Framework's internal representation)
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Output Data Set schema:prov_num:int16;member_num:int8;custid:int32;
Input Data Set schema:prov_num:int16;member_num:int8;custid:int32;
EE Stages Involve A Series Of Processing Steps
InputInterface
Partitioner
Business Logic
Output
Interface
EE Stage
• Piece of Application Logic Running Against Individual Records
• Parallel or Sequential
• Three Sources– Ascential Supplied– Commercial tools/applications– Custom/Existing programs
DS-EE Program Elements
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• EE Delivers Parallelism in Two Ways– Pipeline
– Partition
• Block Buffering Between Components – Eliminates Need for Program
Load Balancing
– Maintains Orderly Data FlowPipeline
Partition
Dual Parallelism Eliminates Bottlenecks!
Producer
Consumer
DS-EE Program ElementsStage Execution
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Stages Control Partition Parallelism
Execution Mode (sequential/parallel) is controlled by Stage
– default = parallel for most Ascential-supplied Stages– User can override default mode– Parallel Stage inserts the default partitioner (Auto) on its input links – Sequential Stage inserts the default collector (Auto) on its input links – user can override default
execution mode (parallel/sequential) of Stage (Advanced tab)choice of partitioner/collector (Input – Partitioning Tab)
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How Parallel Is It?
Degree of Parallelism is determined by the configuration file– Total number of logical nodes in default pool, or a
subset if using "constraints". Constraints are assigned to specific pools as defined in
configuration file and can be referenced in the stage
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OSH
DataStage EE GUI generates OSH scripts– Ability to view OSH turned on in Administrator– OSH can be viewed in Designer using job properties
The Framework executes OSH
What is OSH?– Orchestrate shell– Has a UNIX command-line interface
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OSH Script
An osh script is a quoted string which specifies:– The operators and connections of a single Orchestrate
step – In its simplest form, it is:
osh “op < in.ds > out.ds”
Where:– op is an Orchestrate operator– in.ds is the input data set– out.ds is the output data set
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OSH Operators
Operator is an instance of a C++ class inheriting from APT_Operator
Developers can create new operators
Examples of existing operators:– Import– Export– RemoveDups
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Enable Visible OSH in Administrator
Will be enabled for all projects
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View OSH in Designer
Schema
Operator
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OSH Practice
Exercise 5-1
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Orchestrate May Add Operators to Your Command
$ osh " echo 'Hello world!' [par] > outfile "
Let’s revisit the following OSH command:
3)collector
4)export(from datasetto Unix flat file)
2)partitioner
1)“wrapper”(turning aUnix command intoan DS/EE Operator)
The Framework silently inserts operators (steps 1,2,3,4)
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• Step: unit of OSH program– one OSH command = one step
– at end of step: synchronization, storage to disk
• Datasets: set of rows processed by Framework
– Orchestrate data sets:
– persistent (terminal) *.ds, and
– virtual (internal) *.v.
– Also: flat “file sets” *.fs
• Schema: data description (metadata) for datasets and links.
Steps, with internal and terminal datasets and links, described by schemas
Elements of a Framework Program
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• Consist of Partitioned Data and Schema
• Can be Persistent (*.ds) or Virtual (*.v, Link)
• Overcome 2 GB File Limit
=
What you program: What gets processed:
. . .
Multiple files per partitionEach file up to 2GBytes (or larger)
Operator A
Operator A
Operator A
Operator A
Node 1 Node 2 Node 3 Node 4
data filesof x.ds
$ osh “operator_A > x.ds“
GUI
OSH
Orchestrate Datasets
What gets generated:
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Computing Architectures: Definition
Clusters and MPP Systems
Shared Disk Shared Nothing
Uniprocessor
Dedicated Disk
• IBM, Sun, HP, Compaq• 2 to 64 processors• Majority of installations
Shared Memory
SMP System(Symmetric Multiprocessor)
DiskDisk
CPU
Memory
CPU CPU CPU
• PC• Workstation• Single processor server
CPU
• 2 to hundreds of processors• MPP: IBM and NCR Teradata• each node is a uniprocessor or SMP
CPU
Disk
Memory
CPU
Disk
Memory
CPU
Disk
Memory
CPU
Disk
Memory
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Job Execution:Orchestrate
Conductor Node
C
Processing Node
SL
PP P
SL
PP P
Processing Node
• Conductor - initial DS/EE process– Step Composer– Creates Section Leader processes (one/node)– Consolidates massages, outputs them– Manages orderly shutdown.
• Section Leader – Forks Players processes (one/Stage)– Manages up/down communication.
• Players– The actual processes associated with Stages– Combined players: one process only– Send stderr to SL– Establish connections to other players for data flow– Clean up upon completion.
• Communication:- SMP: Shared Memory- MPP: TCP
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Working with Configuration Files
You can easily switch between config files: '1-node' file - for sequential execution, lighter reports—handy for testing 'MedN-nodes' file - aims at a mix of pipeline and data-partitioned parallelism 'BigN-nodes' file - aims at full data-partitioned parallelism
Only one file is active while a step is runningThe Framework queries (first) the environment variable:
$APT_CONFIG_FILE
# nodes declared in the config file needs not match # CPUsSame configuration file can be used in development and target
machines
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SchedulingNodes, Processes, and CPUs
DS/EE does not: – know how many CPUs are available– schedule
Who knows what?
Who does what?– DS/EE creates (Nodes*Ops) Unix processes – The O/S schedules these processes on the CPUs
Nodes = # logical nodes declared in config. fileOps = # ops. (approx. # blue boxes in V.O.)Processes = # Unix processesCPUs = # available CPUs
Nodes Ops Processes CPUs
User Y N
Orchestrate Y Y Nodes * Ops N
O/S " Y
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{ node "n1" { fastname "s1" pool "" "n1" "s1" "app2" "sort" resource disk "/orch/n1/d1" {} resource disk "/orch/n1/d2" {} resource scratchdisk "/temp" {"sort"} } node "n2" { fastname "s2" pool "" "n2" "s2" "app1" resource disk "/orch/n2/d1" {} resource disk "/orch/n2/d2" {} resource scratchdisk "/temp" {} } node "n3" { fastname "s3" pool "" "n3" "s3" "app1" resource disk "/orch/n3/d1" {} resource scratchdisk "/temp" {} } node "n4" { fastname "s4" pool "" "n4" "s4" "app1" resource disk "/orch/n4/d1" {} resource scratchdisk "/temp" {} }
1
43
2
Configuring DSEE – Node Pools
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{ node "n1" { fastname "s1" pool "" "n1" "s1" "app2" "sort" resource disk "/orch/n1/d1" {} resource disk "/orch/n1/d2" {"bigdata"} resource scratchdisk "/temp" {"sort"} } node "n2" { fastname "s2" pool "" "n2" "s2" "app1" resource disk "/orch/n2/d1" {} resource disk "/orch/n2/d2" {"bigdata"} resource scratchdisk "/temp" {} } node "n3" { fastname "s3" pool "" "n3" "s3" "app1" resource disk "/orch/n3/d1" {} resource scratchdisk "/temp" {} } node "n4" { fastname "s4" pool "" "n4" "s4" "app1" resource disk "/orch/n4/d1" {} resource scratchdisk "/temp" {} }
1
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2
Configuring DSEE – Disk Pools
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node 1 node 2
Parallel to parallel flow may incur reshuffling:Records may jump between nodes
partitioner
Re-Partitioning
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N
Partitioner with parallel import
When a partitioner receives:
• sequential input (1 partition), it creates N partitions
• parallel input (N partitions), it outputs N partitions*, may result in re-partitioning
* Assuming no “constraints”
Nnode 1 node 2
Re-Partitioning X-ray
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Stage 2
Stage 1
partitioner
If Stage 2runs in parallel,DS/EE silently inserts a partitionerupstream of it.
If Stage 1 alsoruns in parallel,re-partitioning occurs.
partition 1 partition 2
In most cases, automatic re-partitioning is benign (no reshuffling), preserving the same partitioning as upstream.
Re-partitioning can be forcedto be benign, using either:
same preserve partitioning
Automatic Re-Partitioning
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Partitioning Methods
Auto
Hash
Entire
Range
Range Map
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• Collectors combine partitions of a dataset into a single input stream to a sequential Stage
data partitions
collector
sequential Stage
...
–Collectors do NOT synchronize data
Collectors
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Partitioning and Repartitioning Are Visible On Job Design
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Partitioning and Collecting Icons
Partitioner Collector
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Setting a Node Constraint in the GUI
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Reading Messages in Director
Set APT_DUMP_SCORE to true
Can be specified as job parameter
Messages sent to Director log
If set, parallel job will produce a report showing the operators, processes, and datasets in the running job
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Messages With APT_DUMP_SCORE = True
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Exercise
Complete exercise 5-2
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Blank
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Module 6
Transforming Data
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Module Objectives
Understand ways DataStage allows you to transform data
Use this understanding to:– Create column derivations using user-defined code or
system functions– Filter records based on business criteria– Control data flow based on data conditions
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Transformed Data
Transformed data is:– Outgoing column is a derivation that may, or may not,
include incoming fields or parts of incoming fields– May be comprised of system variables
Frequently uses functions performed on something (ie. incoming columns)– Divided into categories – I.e.
Date and timeMathematicalLogicalNull handlingMore
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Stages Review
Stages that can transform data– Transformer
ParallelBasic (from Parallel palette)
– Aggregator (discussed in later module)
Sample stages that do not transform data– Sequential– FileSet– DataSet– DBMS
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Transformer Stage Functions
Control data flow
Create derivations
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Flow Control
Separate record flow down links based on data condition – specified in Transformer stage constraints
Transformer stage can filter records
Other stages can filter records but do not exhibit advanced flow control– Sequential– Lookup– Filter
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Rejecting Data
Reject option on sequential stage– Data does not agree with meta data– Output consists of one column with binary data type
Reject links (from Lookup stage) result from the drop option of the property “If Not Found”– Lookup “failed”– All columns on reject link (no column mapping option)
Reject constraints are controlled from the constraint editor of the transformer– Can control column mapping– Use the “Other/Log” checkbox
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Rejecting Data Example
“If Not Found” property
Contstraint – Other/log option
Property Reject Mode = Output
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Transformer Stage Properties
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Transformer Stage Variables
First of transformer stage entities to execute
Execute in order from top to bottom– Can write a program by using one stage variable to
point to the results of a previous stage variable
Multi-purpose– Counters– Hold values for previous rows to make comparison– Hold derivations to be used in multiple field dervations– Can be used to control execution of constraints
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Stage Variables
Show/Hide button
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Transforming Data
Derivations– Using expressions– Using functions
Date/time
Transformer Stage Issues– Sometimes require sorting before the transformer stage
– I.e. using stage variable as accumulator and need to break on change of column value
Checking for nulls
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Checking for Nulls
Nulls can get introduced into the dataflow because of failed lookups and the way in which you chose to handle this condition
Can be handled in constraints, derivations, stage variables, or a combination of these
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Nullability
Can set the value of null; i.e.. If value of column is null put “NULL” in the outgoing column
Source Field Destination Field Result
not_nullable not_nullable Source value propagates to destination.
not_nullable nullable Source value propagates; destination value is never null.
nullable not_nullable WARNING messages in log. If source value is null,a fatal error occurs. Must handle in transformer.
nullable nullable Source value or null propagates.
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Transformer Stage- Handling Rejects
1. Constraint Rejects– All expressions are false
and reject row is checked
2. Expression Error Rejects– Improperly Handled Null
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Transformer: Execution Order
• Derivations in stage variables are executed first
• Constraints are executed before derivations
• Column derivations in earlier links are executed before later links
• Derivations in higher columns are executed before lower columns
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Two Transformers for the Parallel Palette
All > Processing >
Transformer
Is the non-Universe transformer
Has a specific set of functions
No DS routines available
Parallel > Processing
Basic Transformer
Makes server style transforms available on the parallel palette
Can use DS routines
No need for shared container to get Universe functionality on the parallel palette•Program in Basic for both transformers
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Transformer Functions From Derivation Editor
Data & Time
Logical
Mathematical
Null Handling
Number
Raw
String
Type Conversion
Utility
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Timestamps and Dates
Data & Time
Also some in Type Conversion
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Exercise
Complete exercises 6-1, 6-2, and 6-3
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Module 7
Sorting Data
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Objectives
Understand DataStage EE sorting options
Use this understanding to create sorted list of data to enable functionality within a transformer stage
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Sorting Data
Important because– Transformer may be using stage variables for
accumulators or control breaks and order is important– Other stages may run faster – I.e Aggregator– Facilitates the RemoveDups stage, order is important– Job has partitioning requirements
Can be performed – Option within stages (use input > partitioning tab and
set partitioning to anything other than auto)– As a separate stage (more complex sorts)
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Sorting Alternatives
• Alternative representation of same flow:
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Sort Option on Stage Link
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Sort Stage
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Sort Utility
DataStage – the default
SyncSort
UNIX
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Sort Stage - Outputs
Specifies how the output is derived
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Sort Specification Options
Input Link Property
– Limited functionality– Max memory/partition is 20 MB, then
spills to scratch Sort Stage
– Tunable to use more memory before spilling to scratch.
Note: Spread I/O by adding more scratch file systems to each node of the APT_CONFIG_FILE
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Removing Duplicates
Can be done by Sort – Use unique option
OR
Remove Duplicates stage– Has more sophisticated ways to remove duplicates
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Exercise
Complete exercise 7-1
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Blank
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Module 8
Combining Data
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Objectives
Understand how DataStage can combine data using the Join, Lookup, Merge, and Aggregator stages
Use this understanding to create jobs that will– Combine data from separate input streams– Aggregate data to form summary totals
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Combining Data
There are two ways to combine data:
– Horizontally: Several input links; one output link (+ optional rejects) made of columns from different input links. E.g.,
JoinsLookupMerge
– Vertically: One input link, output with column combining values from all input rows. E.g.,
Aggregator
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Recall the Join, Lookup & Merge
Stages
These "three Stages" combine two or more input links according to values of user-designated "key" column(s).
They differ mainly in:– Memory usage– Treatment of rows with unmatched key values– Input requirements (sorted, de-duplicated)
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Joins - Lookup - Merge:Not all Links are Created Equal!
Joins Lookup Merge
Primary Input: port 0 Left Source MasterSecondary Input(s): ports 1,… Right LU Table(s) Update(s)
• enterprise edition distinguishes between:- The Primary Input (Framework port 0)- Secondary - in some cases "Reference" (other ports)
• Naming convention:
Tip: Check "Input Ordering" tab to make sure intended
Primary is listed first
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Join Stage Editor
One of four variants:– Inner– Left Outer– Right Outer– Full Outer
Several key columns allowed
Link Order immaterial for Inner and Full Outer Joins (but VERY important for Left/Right Outer and Lookup and Merge)
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1. The Join Stage
Four types:
2 sorted input links, 1 output link – "left" on primary input, "right" on secondary input– Pre-sort make joins "lightweight": few rows need to be in RAM
• Inner• Left Outer• Right Outer• Full Outer
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2. The Lookup Stage
Combines: – one source link with– one or more duplicate-free table links
no pre-sort necessaryallows multiple keys LUTsflexible exception handling forsource input rows with no match
Lookup
Sourceinput
One or more tables (LUTs)
Output Reject
0
1
2
0
1
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The Lookup Stage
Lookup Tables should be small enough to fit into physical memory (otherwise, performance hit due to paging)
– Space time trade-off: presort vs. in RAM table
On an MPP you should partition the lookup tables using entire partitioning method, or partition them the same way you partition the source link
On an SMP, no physical duplication of a Lookup Table occurs
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The Lookup Stage
Lookup File Set – Like a persistent data set only it contains
metadata about the key.– Useful for staging lookup tables
RDBMS LOOKUP– SPARSE
Select for each row. Might become a performance bottleneck.
– NORMAL Loads to an in memory hash table first.
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3. The Merge Stage
Combines – one sorted, duplicate-free master (primary) link with – one or more sorted update (secondary) links.– Pre-sort makes merge "lightweight": few rows need to be in RAM (as with
joins, but opposite to lookup). Follows the Master-Update model:
– Master row and one or more updates row are merged if they have the same value in user-specified key column(s).
– A non-key column occurs in several inputs? The lowest input port number prevails (e.g., master over update; update values are ignored)
– Unmatched ("Bad") master rows can be either kept dropped
– Unmatched ("Bad") update rows in input link can be captured in a "reject" link– Matched update rows are consumed.
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The Merge Stage
Allows composite keysMultiple update linksMatched update rows are consumed Unmatched updates can be captured LightweightSpace/time tradeoff: presorts vs. in-RAM table
Master One or more updates
Output Rejects
Merge
0
0
21
21
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In this table:
• , <comma> = separator between primary and secondary input links
(out and reject links)
Synopsis:Joins, Lookup, & Merge
Joins Lookup Merge
Model RDBMS-style relational Source - in RAM LU Table Master -Update(s)Memory usage light heavy light
# and names of Inputs exactly 2: 1 left, 1 right 1 Source, N LU Tables 1 Master, N Update(s)
Mandatory Input Sort both inputs no all inputsDuplicates in primary input OK (x-product) OK Warning!Duplicates in secondary input(s) OK (x-product) Warning! OK only when N = 1Options on unmatched primary NONE [fail] | continue | drop | reject [keep] | dropOptions on unmatched secondary NONE NONE capture in reject set(s)
On match, secondary entries are reusable reusable consumed
# Outputs 1 1 out, (1 reject) 1 out, (N rejects)Captured in reject set(s) Nothing (N/A) unmatched primary entries unmatched secondary entries
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The Aggregator Stage
Purpose: Perform data aggregations
Specify:
Zero or more key columns that define the aggregation units (or groups)
Columns to be aggregated
Aggregation functions:count (nulls/non-nulls) sum
max/min/rangestandard error %coeff. of variationsum of weights un/corrected sum of squaresvariance mean standard
deviation
The grouping method (hash table or pre-sort) is a performance issue
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Grouping Methods
Hash: results for each aggregation group are stored in a hash table, and the table is written out after all input has been processed– doesn’t require sorted data– good when number of unique groups is small. Running tally
for each group’s aggregate calculations need to fit easily into memory. Require about 1KB/group of RAM.
– Example: average family income by state, requires .05MB of RAM
Sort: results for only a single aggregation group are kept in memory; when new group is seen (key value changes), current group written out.– requires input sorted by grouping keys– can handle unlimited numbers of groups– Example: average daily balance by credit card
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Aggregator Functions
Sum
Min, max
Mean
Missing value count
Non-missing value count
Percent coefficient of variation
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Aggregator Properties
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Aggregation Types
Aggregation types
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Containers
Two varieties– Local– Shared
Local– Simplifies a large, complex diagram
Shared– Creates reusable object that many jobs can include
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Creating a Container
Create a job
Select (loop) portions to containerize
Edit > Construct container > local or shared
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Using a Container
Select as though it were a stage
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Exercise
Complete exercise 8-1
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Module 9
Configuration Files
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Objectives
Understand how DataStage EE uses configuration files to determine parallel behavior
Use this understanding to– Build a EE configuration file for a computer system– Change node configurations to support adding
resources to processes that need them– Create a job that will change resource allocations at the
stage level
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Configuration File Concepts
Determine the processing nodes and disk space connected to each node
When system changes, need only change the configuration file – no need to recompile jobs
When DataStage job runs, platform reads configuration file– Platform automatically scales the application to fit the
system
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Processing Nodes Are
Locations on which the framework runs applications
Logical rather than physical construct
Do not necessarily correspond to the number of CPUs in your system– Typically one node for two CPUs
Can define one processing node for multiple physical nodes or multiple processing nodes for one physical node
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Optimizing Parallelism
Degree of parallelism determined by number of nodes defined
Parallelism should be optimized, not maximized– Increasing parallelism distributes work load but also
increases Framework overhead
Hardware influences degree of parallelism possible
System hardware partially determines configuration
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More Factors to Consider
Communication amongst operators– Should be optimized by your configuration– Operators exchanging large amounts of data should be
assigned to nodes communicating by shared memory or high-speed link
SMP – leave some processors for operating system
Desirable to equalize partitioning of data
Use an experimental approach– Start with small data sets– Try different parallelism while scaling up data set sizes
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Factors Affecting Optimal Degree of Parallelism
CPU intensive applications– Benefit from the greatest possible parallelism
Applications that are disk intensive– Number of logical nodes equals the number of disk
spindles being accessed
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EE Configuration File
Text file containing string data that is passed to the Framework– Sits on server side– Can be displayed and edited
Name and location found in environmental variable APT_CONFIG_FILE
Components– Node– Fast name– Pools– Resource
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Sample Configuration File
{
node “Node1"
{
fastname "BlackHole"
pools "" "node1"
resource disk "/usr/dsadm/Ascential/DataStage/Datasets" {pools "" }
resource scratchdisk "/usr/dsadm/Ascential/DataStage/Scratch" {pools "" }
}
}
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Node Options
• Node name - name of a processing node used by EE– Typically the network name– Use command uname -n to obtain network name
Fastname – – Name of node as referred to by fastest network in the system– Operators use physical node name to open connections– NOTE: for SMP, all CPUs share single connection to network
Pools– Names of pools to which this node is assigned– Used to logically group nodes– Can also be used to group resources
Resource– Disk– Scratchdisk
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Node Pools
Node “node1" {
fastname “server_name” pool "pool_name”
}
"pool_name" is the name of the node pool. I.e. “extra”
Node pools group processing nodes based on usage.
– Example: memory capacity and high-speed I/O.
One node can be assigned to multiple pools.
Default node pool (” ") is made up of each node defined in the config file, unless it’s qualified as belonging to a different pool and it is not designated as belonging to the default pool (see following example).
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Resource Disk and Scratchdisk
node “node_0" {
fastname “server_name” pool "pool_name”
resource disk “path” {pool “pool_1”}
resource scratchdisk “path” {pool “pool_1”}
...
}
Resource type can be disk(s) or scratchdisk(s)
"pool_1" is the disk or scratchdisk pool, allowing you to group disks and/or scratchdisks.
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Disk Pools
Disk pools allocate storage
Pooling applies to both disk types
By default, EE uses the default pool, specified by “”
pool "bigdata"
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Sorting Requirements
Resource pools can also be specified for sorting:
The Sort stage looks first for scratch disk resources in a “sort” pool, and then in the default disk pool
Sort uses as many scratch disks as defined in the first pool it finds
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{ node "n1" { fastname “s1" pool "" "n1" "s1" "sort" resource disk "/data/n1/d1" {} resource disk "/data/n1/d2" {} resource scratchdisk "/scratch" {"sort"} } node "n2" { fastname "s2" pool "" "n2" "s2" "app1" resource disk "/data/n2/d1" {} resource scratchdisk "/scratch" {} } node "n3" { fastname "s3" pool "" "n3" "s3" "app1" resource disk "/data/n3/d1" {} resource scratchdisk "/scratch" {} } node "n4" { fastname "s4" pool "" "n4" "s4" "app1" resource disk "/data/n4/d1" {} resource scratchdisk "/scratch" {} } ...}
{ node "n1" { fastname “s1" pool "" "n1" "s1" "sort" resource disk "/data/n1/d1" {} resource disk "/data/n1/d2" {} resource scratchdisk "/scratch" {"sort"} } node "n2" { fastname "s2" pool "" "n2" "s2" "app1" resource disk "/data/n2/d1" {} resource scratchdisk "/scratch" {} } node "n3" { fastname "s3" pool "" "n3" "s3" "app1" resource disk "/data/n3/d1" {} resource scratchdisk "/scratch" {} } node "n4" { fastname "s4" pool "" "n4" "s4" "app1" resource disk "/data/n4/d1" {} resource scratchdisk "/scratch" {} } ...}
4 5
1
6
2 3
Configuration File: Example
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Resource Types
Disk
Scratchdisk
DB2
Oracle
Saswork
Sortwork
Can exist in a pool– Groups resources together
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Using Different Configurations
Lookup stage where DBMS is using a sparse lookup type
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Building a Configuration File
Scoping the hardware:– Is the hardware configuration SMP, Cluster, or MPP?– Define each node structure (an SMP would be single node):
Number of CPUs CPU speed Available memory Available page/swap space Connectivity (network/back-panel speed)
– Is the machine dedicated to EE? If not, what other applications are running on it?
– Get a breakdown of the resource usage (vmstat, mpstat, iostat)
– Are there other configuration restrictions? E.g. DB only runs on certain nodes and ETL cannot run on them?
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To Create Hardware Specifications
Hardware Type ___________
Node Name _____________
# CPUs _____________
CPU Speed _____________
Memory _____________
Page Space _____________
Swap Space _____________
TCP Addr Switch Addr
_____________ _____________
Complete one per nodeComplete one per disk subsystem
Hardware Type ________________
Shared between nodes Y or N
Storage Type ________________
Storage Size ________________
Read Cache size _______________
Write Cache size _______________
Read hit ratio _______________
Write hit ratio _______________
I/O rate (R/W) _______________
# channels/ controllers____
Throughput ____
In addition, record all coexistence usage (other applications or subsystems sharing this disk subsystem).
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“Ballpark” Tuning
1. Calculate the theoretic I/O bandwidth available (don’t forget to reduce this by the amount other applications on this machine or others are impacting the I/O subsystem). See DS Performance and tuning for calculation methods.
2. Determine the I/O bandwidth being achieved by the DS application (rows/sec * bytes/row).
3. If the I/O rate isn’t approximately equal to the theoretical, there is probably a bottleneck elsewhere (CPU, Memory, etc).
4. Attempt to tune to the I/O bandwidth. 5. Pay particular attention to I/O intensive competing
workloads such as database logging, paging/swapping, etc.
As a rule of thumb, generally expect the application to be I/O constrained. First try to parallelize (spread out) the I/O as much as possible. To validate that you’ve achieved this:
Some useful commands:iostat (I/O activity)vmstat (system activity)mpstat (processor utilizationsar (resource usage)
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Exercise
Complete exercise 9-1 and 9-2
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Blank
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Module 10
Extending DataStage EE
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Objectives
Understand the methods by which you can add functionality to EE
Use this understanding to:– Build a DataStage EE stage that handles special
processing needs not supplied with the vanilla stages– Build a DataStage EE job that uses the new stage
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EE Extensibility Overview
Sometimes it will be to your advantage to leverage EE’s extensibility. This extensibility includes:
Wrappers
Buildops
Custom Stages
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When To Leverage EE Extensibility
Types of situations:Complex business logic, not easily accomplished using standard EE stagesReuse of existing C, C++, Java, COBOL, etc…
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Wrappers vs. Buildop vs. Custom
Wrappers are good if you cannot or do not want to modify the application and performance is not critical.
Buildops: good if you need custom coding but do not need dynamic (runtime-based) input and output interfaces.
Custom (C++ coding using framework API): good if you need custom coding and need dynamic input and output interfaces.
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Building “Wrapped” Stages
You can “wrapper” a legacy executable: Binary Unix command Shell script
… and turn it into a enterprise edition stage capable, among other things, of parallel execution…
As long as the legacy executable is: amenable to data-partition parallelism
no dependencies between rows
pipe-safe can read rows sequentially no random access to data
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Wrappers (Cont’d)
Wrappers are treated as a black box EE has no knowledge of contents
EE has no means of managing anything that occurs inside the wrapper
EE only knows how to export data to and import data from the wrapper
User must know at design time the intended behavior of the wrapper and its schema interface
If the wrappered application needs to see all records prior to processing, it cannot run in parallel.
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LS Example
Can this command be wrappered?
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Creating a Wrapper
Used in this job ---
To create the “ls” stage
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Creating Wrapped Stages
From Manager:Right-Click on Stage Type
> New Parallel Stage > Wrapped
We will "Wrapper” an existing Unix executables – the ls command
Wrapper Starting Point
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Wrapper - General Page
Unix command to be wrapped
Name of stage
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Conscientiously maintaining the Creator page for all your wrapped stages will eventually earn you the thanks of others.
The "Creator" Page
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Wrapper – Properties Page
If your stage will have properties appear, complete the Properties page
This will be the name of the property as it
appears in your stage
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Wrapper - Wrapped Page
Interfaces – input and output columns - these should first be entered into the table definitions meta data (DS Manager); let’s
do that now.
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• Layout interfaces describe what columns the stage:– Needs for its inputs (if any)– Creates for its outputs (if any)– Should be created as tables with columns in Manager
Interface schemas
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Column Definition for Wrapper Interface
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How Does the Wrapping Work?
– Define the schema for export and importSchemas become interface
schemas of the operator and allow for by-name column access
– Define multiple inputs/outputs required by UNIX executable
import
export
stdout ornamed pipe
stdin ornamed pipe
UNIX executable
output schema
input schema
QUIZ: Why does export precede import?
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Update the Wrapper Interfaces
This wrapper will have no input interface – i.e. no input link. The location will come as a job parameter that will be passed to the appropriate stage property.
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Resulting Job
Wrapped stage
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Job Run
Show file from Designer palette
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Wrapper Story: Cobol Application
Hardware Environment: – IBM SP2, 2 nodes with 4 CPU’s per node.
Software:– DB2/EEE, COBOL, EE
Original COBOL Application:– Extracted source table, performed lookup against table in DB2, and
Loaded results to target table.– 4 hours 20 minutes sequential execution
enterprise edition Solution:– Used EE to perform Parallel DB2 Extracts and Loads– Used EE to execute COBOL application in Parallel– EE Framework handled data transfer between
DB2/EEE and COBOL application– 30 minutes 8-way parallel execution
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Buildops
Buildop provides a simple means of extending beyond the functionality provided by EE, but does not use an existing executable (like the wrapper)
Reasons to use Buildop include: Speed / Performance
Complex business logic that cannot be easily represented using existing stages
– Lookups across a range of values– Surrogate key generation– Rolling aggregates
Build once and reusable everywhere within project, no shared container necessary
Can combine functionality from different stages into one
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BuildOps
– The user performs the fun tasks: encapsulate the business logic in a custom operator
– The enterprise edition interface called “buildop” automatically performs the tedious, error-prone tasks: invoke needed header files, build the necessary “plumbing” for a correct and efficient parallel execution.
– Exploits extensibility of EE Framework
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From Manager (or Designer):Repository pane:
Right-Click on Stage Type > New Parallel Stage > {Custom | Build | Wrapped}
• "Build" stages from within enterprise edition
• "Wrapping” existing “Unix” executables
BuildOp Process Overview
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General Page
Identicalto Wrappers,except: Under the Build
Tab, your program!
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Logic Tab forBusiness Logic
Enter Business C/C++ logic and arithmetic in four pages under the Logic tab
Main code section goes in Per-Record page- it will be applied to all rows
NOTE: Code will need to be Ansi C/C++ compliant. If code does not compile outside of EE, it won’t compile within EE either!
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Code Sections under Logic Tab
Temporary variables declared [and initialized] here
Logic here is executed once BEFORE processing the FIRST row
Logic here is executed once AFTER processing the LAST row
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I/O and Transfer
Under Interface tab: Input, Output & Transfer pages
Optional renaming of output port from default "out0"
Write row
Input page: 'Auto Read'Read next row
In-RepositoryTable Definition
'False' setting,not to interfere with Transfer page
First line: output 0
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I/O and Transfer
• Transfer from input in0 to output out0.• If page left blank or Auto Transfer = "False" (and RCP = "False") Only columns in output Table Definition are written
First line:Transfer of index 0
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Building StagesSimple Example
Example - sumNoTransfer– Add input columns "a" and "b"; ignores other columns
that might be present in input– Produces a new "sum" column– Do not transfer input columns
sumNoTransfera:int32; b:int32
sum:int32
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NO TRANSFER
• Causes:
- RCP set to "False" in stage definition and
- Transfer page left blank, or Auto Transfer = "False"
• Effects:
- input columns "a" and "b" are not transferred
- only new column "sum" is transferred
Compare with transfer ON…
From Peek:
No Transfer
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Transfer
TRANSFER
• Causes:
- RCP set to "True" in stage definition or
- Auto Transfer set to "True"
• Effects:- new column "sum" is transferred, as well as- input columns "a" and "b" and- input column "ignored" (present in input, but
not mentioned in stage)
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Out Table;
Output
Adding a Column With Row ID
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Columns
DS-EE type
Defined in Table Definitions
Value refreshed from row to row
Temp C++ variables
C/C++ type
Need declaration (in Definitions or Pre-Loop page)
Value persistent throughout "loop" over rows, unless modified in code
Columns vs. Temporary C++ Variables
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Exercise
Complete exercise 10-1 and 10-2
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Exercise
Complete exercises 10-3 and 10-4
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Custom Stage
Reasons for a custom stage:– Add EE operator not already in DataStage EE– Build your own Operator and add to DataStage EE
Use EE API
Use Custom Stage to add new operator to EE canvas
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Custom Stage
DataStage Manager > select Stage Types branch > right click
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Custom Stage
Name of Orchestrate operator to be used
Number of input and output links allowed
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Custom Stage – Properties Tab
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The Result
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Blank
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Module 11
Meta Data in DataStage EE
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Objectives
Understand how EE uses meta data, particularly schemas and runtime column propagation
Use this understanding to:– Build schema definition files to be invoked in DataStage
jobs– Use RCP to manage meta data usage in EE jobs
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Establishing Meta Data
Data definitions– Recordization and columnization– Fields have properties that can be set at individual field
levelData types in GUI are translated to types used by EE
– Described as properties on the format/columns tab (outputs or inputs pages) OR
– Using a schema file (can be full or partial)
Schemas– Can be imported into Manager– Can be pointed to by some job stages (i.e. Sequential)
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Data Formatting – Record Level
Format tab
Meta data described on a record basis
Record level properties
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Data Formatting – Column Level
Defaults for all columns
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Column Overrides
Edit row from within the columns tab
Set individual column properties
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Extended Column Properties
Field and string
settings
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Extended Properties – String Type
Note the ability to convert ASCII to EBCDIC
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Editing Columns
Properties depend on the data type
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Schema
Alternative way to specify column definitions for data used in EE jobs
Written in a plain text file
Can be written as a partial record definition
Can be imported into the DataStage repositoryrecord {final_delim=end, delim=",", quote=double}
( first_name: string;
last_name: string;
gender: string;
birth_date: date;
income: decimal[9,2];
state: string;
)
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Creating a Schema
Using a text editor– Follow correct syntax for definitions– OR
Import from an existing data set or file set– On DataStage Manager import > Table Definitions >
Orchestrate Schema Definitions– Select checkbox for a file with .fs or .ds
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Importing a Schema
Schema location can be on the server or local
work station
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Data Types
Date
Decimal
Floating point
Integer
String
Time
Timestamp
Vector
Subrecord
Raw
Tagged
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Partial Schemas
Only need to define column definitions that you are actually going to operate on
Allowed by stages with format tab– Sequential file stage– File set stage– External source stage– External target stage– Column import stage
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Runtime Column Propagation
DataStage EE is flexible about meta data. It can cope with the situation where meta data isn’t fully defined. You can define part of your schema and specify that, if your job encounters extra columns that are not defined in the meta data when it actually runs, it will adopt these extra columns and propagate them through the rest of the job. This is known as runtime column propagation (RCP).
RCP is always on at runtime.
Design and compile time column mapping enforcement.
– RCP is off by default.– Enable first at project level. (Administrator project
properties)– Enable at job level. (job properties General tab)– Enable at Stage. (Link Output Column tab)
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Enabling RCP at Project Level
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Enabling RCP at Job Level
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Enabling RCP at Stage Level
Go to output link’s columns tab
For transformer you can find the output links columns tab by first going to stage properties
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Using RCP with Sequential Stages
To utilize runtime column propagation in the sequential stage you must use the “use schema” option
Stages with this restriction:– Sequential– File Set– External Source– External Target
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Runtime Column Propagation
When RCP is Disabled– DataStage Designer will enforce Stage Input
Column to Output Column mappings.– At job compile time modify operators are
inserted on output links in the generated osh.
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Runtime Column Propagation
When RCP is Enabled– DataStage Designer will not enforce mapping
rules.– No Modify operator inserted at compile time.– Danger of runtime error if column names
incoming do not match column names outgoing link – case sensitivity.
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Exercise
Complete exercises 11-1 and 11-2
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Module 12
Job Control Using the Job Sequencer
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Objectives
Understand how the DataStage job sequencer works
Use this understanding to build a control job to run a sequence of DataStage jobs
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Job Control Options
Manually write job control– Code generated in Basic– Use the job control tab on the job properties page– Generates basic code which you can modify
Job Sequencer– Build a controlling job much the same way you build
other jobs– Comprised of stages and links– No basic coding
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Job Sequencer
Build like a regular job
Type “Job Sequence”
Has stages and links
Job Activity stage represents a DataStage job
Links represent passing control
Stages
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Example
Job Activity stage – contains
conditional triggers
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Job Activity Properties
Job parameters to be passed
Job to be executed – select from dropdown
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Job Activity Trigger
Trigger appears as a link in the diagram
Custom options let you define the code
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Options
Use custom option for conditionals– Execute if job run successful or warnings only
Can add “wait for file” to execute
Add “execute command” stage to drop real tables and rename new tables to current tables
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Job Activity With Multiple Links
Different links having different
triggers
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Sequencer Stage
Can be set to all or any
Build job sequencer to control job for the collections application
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Notification
Notification Stage
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Notification Activity
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Sample DataStage log from Mail Notification
Sample DataStage log from Mail Notification
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E-Mail Message
Notification Activity Message
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Exercise
Complete exercise 12-1
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Module 13
Testing and Debugging
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Objectives
Understand spectrum of tools to perform testing and debugging
Use this understanding to troubleshoot a DataStage job
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Environment Variables
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Parallel Environment Variables
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Environment VariablesStage Specific
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Environment Variables
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Environment VariablesCompiler
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Typical Job Log Messages:
Environment variables
Configuration File information
Framework Info/Warning/Error messages
Output from the Peek Stage
Additional info with "Reporting" environments
Tracing/Debug output
– Must compile job in trace mode– Adds overhead
The Director
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• Job Properties, from Menu Bar of Designer• Director will
prompt you before eachrun
Job Level Environmental Variables
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Troubleshooting
If you get an error during compile, check the following:
Compilation problems– If Transformer used, check C++ compiler, LD_LIRBARY_PATH– If Buildop errors try buildop from command line– Some stages may not support RCP – can cause column mismatch .– Use the Show Error and More buttons– Examine Generated OSH– Check environment variables settings
Very little integrity checking during compile, should run validate from Director.
Highlights source of error
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Generating Test Data
Row Generator stage can be used– Column definitions– Data type dependent
Row Generator plus lookup stages provides good way to create robust test data from pattern files
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