Jvm mbeans jmxtran

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Copyright 2011 eXo Platform

Introduced by: Nghi Nguyen Van~ March, 22nd 2012 ~

JVM Inside & monitoring with MBean, jmxtrans, graphite

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●●●●Agenda

1. Introduction2. JVM & Memory Structure in JVM3. JMX and MBean4. Jmxtrans as a JVM query tool5. Demo graphite as a JVM historical data manager tool6. Tips and tricks7. Q & A



●●●●

Purpose of this presentation:Purposes of monitoring a JVM

Introduce about a way to monitor a JVM

Introduce about how to build an eXo product JVM monitoring system

This presentation serves to:● Leaders to understand about performance test reports and to give

advices & suggestions with performance test reports base on the JVM detail information

● Who is new in using JVM monitoring tools

● Testers who have to work directly and often with JVM monitoring tools

Introduction

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Purposes of monitoring JVM



●●●●Value of a software product

• Meet the business requirement• Users satisfaction• Save time and money, give more business value• Rich features• Stable, high performance• Easy to backup/maintain/improve• …

Value of code (Value of a product)



●●●●• The code generates value when it is used/run/inherit not when we

write it• We need to know how our code performed when it run• We cannot do this unless we measure it

We want to make our code more value



●●●●

• map ≠ territory• map of Ha noi ≠ city of Ha noi• the way we talk ≠ the way it is• the way we think of ≠ the way itself• perception ≠ reality

Why measure



●●●●• We have mental model of the code• mental model, it's not the code• Sometime, it's wrong• Sometime, it’s a big mistake

Why measure – mental model, it's not the code



●●●●• We cant know until we measure it

Why measure – cont.



●●●●• This affect how we make decisions

1. A better mental model make us better at deciding what to do

2. A better mental model make us better at generating value

3. Measuring make our decisions better

Why measure – cont.

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JVM & Memory Structure in JVM



●●●●Java – how java code executed



●●●●Java Virtual Machine architecture



●●●●Java - JVM Memory Structure – Heap detail

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JMX and MBean



●●●●• Java Management Extension

• It consists of:

• An architecture• Design patterns• Java APIs• Services for application and network management

What is the JMX



●●●●What is the JMX (cont.)

• Enables Java applications to be managed without heavy investment– Little impact on Java application design

• Provides scaleable management architecture– Component architecture, pick and choose components

• Integrates existing management solutions– Can be managed via multiple protocols, e.g. SNMP, WBEM, HTTP

– Information model independent

• Leverages existing standard Java



●●●●The JMX architecture



●●●●The JMX architecture (cont.)

• The JMX architecture defines three levels:– Instrumentation Level

• How to instrument managed resources– Server Level

• How managed resources are managed via the management server– Distributed Services Level

• How distributed clients and management applications access and interact with servers and the managed resources in the servers



●●●●The JMX architecture (cont.)

• Basic goal– In a running Java application, we would like to be able to:

• Manage existing Java objects:– get an attribute value

– change an attribute value

– invoke an operation

• Add new Java objects:– using existing Java classes

– using new classes from an arbitrary location

• And do all this from a remote location



●●●●MBean

• MBean: Managed bean. Java class implementing a management interface and representing a resource to be managed or monitored

• MBean– Defines how resources are instrumented using MBean– MBean instrumentation allows the resource to be manageable

through JMX-compliant agents• Notification Model

– MBean and other JMX components

may emit notifications• MBean Metadata Classes

– Describes the MBean's management

interface for management agents

and management



●●●●MBean (cont.)

• An MBean exposes the management interface of the managed resource/object– The management interface is the set of information and controls that

a management application uses to operate on the resource




• An MBean exposes the management interface as:– Attributes which may be accessed

– Operations which may be invoked

– Notifications which may be emitted (optional)

– Constructors for the MBean's Java class

• An MBean follows design patterns– The way an attribute or operation to be exposed has to be declared

• An MBean must be registered in the MBean server to be visible remotely

• An MBean does not know about its MBean




• The MBean server is a registry of objects which are exposed to management operations in a server– Only registered MBean can be managed from outside the server's

JVM

• The MBean server only exposes an MBean's management interface (not the MBean's direct reference)

• Also provides standardized interface for accessing MBean within the same JVM



●●●●Tools that allow to connect to JVM remotely via JMX

• Jconsole• visualvm• Memory Analyzer Tool• …



●●●●Tools that allow to deal with MBean through web interface

• JBoss jmx console– Enable user name and password here: server/default/conf/props/jmx-

console-users.properties

• javamelody• …



●●●●JMX notice – enable JMX RMI connection first

-Dcom.sun.management.jmxremote=true -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.port=8004 -Dcom.sun.management.jmxremote.authenticate=false

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Jmxtrans as a JVM query tool



●●●●Jmxtrans introduction

• jmxtrans is a tool which allows you to connect to any number of Java Virtual Machines (JVM's) and query them for their attributes without writing a single line of Java code

• The attributes are exported from the JVM via Java Management Extensions (JMX)

• eXo Platform and others implement MBean interface

• The query language: JSON format.• OutputWriters:

– write output automatically base on class name

– can output to: graphite, gangila, keyout, RRD...



●●●●Jmxtrans introduction (cont.)



●●●●eXo Platform MBean items

• eXo JCR session– exo:portal="portal",repository="repository",service=SessionRegistry

• Size• TimeOut

• eXo Cache: collaboration– exo:portal="portal",repository="repository",workspace="collaboratio

n",cache-type=JCR_CACHE,jmx-resource=CacheMgmtInterceptor

• Size• MissCount• HitCount• Capacity• TimeToLive



●●●●eXo Platform MBean items (cont.)



●●●●Jmxtrans query – single query

• TARGET_JMX_PORT = eXo product JMX port• TARGET_JMX_HOST = eXo product host address• TARGET_GRAPHITE_HOST = graphite server address• TARGET_GRAPHITE_PORT = graphite server port• outputWriters class:

com.googlecode.jmxtrans.model.output.GraphiteWriter



●●●●Jmxtrans query – single query – MBean query part



●●●●Jmxtrans query – single query – Output part



●●●●Jmxtrans query – single query – list of query



●●●●Jmxtrans query – wildcard syntax

• Jmxtrans support wildcard syntax• typeNames should be defined wildcard applied

– Purpose is: filtering and classifying

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Demo graphite as a JVM historical data manager tool

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Install & using graphite Install graphite Build graphite dashboards Data calculation while building graphs get single image by URL Export graph data to csv data format



●●●●eXo Platform JVM historical data



●●●●eXo Platform JVM historical data (cont.)

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Tips & tricks

1. Perform jmxtrans.sh start many time until the messgae that there is a jmxtrans process exist

2. jmxtrans must start after the application start3. use curl, wget… to collect specific data/graph from

graphite automatically4. use the graphs’ csv datasheet to compare data between

graphs’ content5. A graph with multiple data lines can hide some

information from some line. Try to expand into multiple graphs

6. try to export all the data in a needed term to use later7. Default graphite data history is 24hours, it should be

changed to longer to avoid missing of needed data

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Links

1. http://code.google.com/p/jmxtrans2. http://graphite.wikidot.com/3. https://wiki-int.exoplatform.org/display/QAF/Graphite4. http://www.oracle.com/technetwork/java/javase/tech/

docs-jsp-135989.html5. http://

docs.oracle.com/javase/tutorial/jmx/MBean/index.html

6. http://docs.oracle.com/javase/specs/jls/se5.0/html/j3TOC.html

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Q & A

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Thank you!

Jvm mbeans jmxtran

Technology

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