Gain a MongoDB Advantage with the Percona Memory Engine...• Data from the MongoDB query profiler...

©2017Percona1

VadimTkachenko

GainaMongoDBAdvantagewiththePerconaMemoryEngineWebinarDecember6th,2017

CTO,Percona

©2017Percona2

Me• CTOatPercona

• LeadingSoftwareEngineeringatPercona

• Technology&(database,hardware,filesystems)PerformanceEnthusiast

• Currentareasofinterest:MySQL,MongoDBandClickHouse

• @VadimTk

©2017Percona3

MemoryEngine• https://www.percona.com/software/mongo-database/percona-

memory-engine-for-mongodb

• StorageEngineinPerconaServerForMongoDB• BasedonwiredTiger• butwithoutwritestothestorage• HighWriteThroughput• HighReadThroughput• Predictable,lowlatencies

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MemoryEngineusecases

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ApplicationcacheReplaceservicessuchasmemcached andcustomapplication-leveldatastructureswiththefullpowerofMongoDBfeatures.

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Typicalarchitecture

Databaselayer(MongoDB,MySQL,etc)

Cachinglayer(memcached or

Redis)

Key-valuestoreLimitedcapabilities

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Betterway

Databaselayer(MongoDB,MySQL,etc)

CachinglayerPerconaMemory

Engine

• Documentstore• Flexiblequerylanguage• Replication/sharding• FamiliarMongoDBdeployment

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SessionmanagementDecreaseapplicationresponsetimesbykeepingactiveusersessionsinmemory.

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TransientruntimestateStoreapplicationstateful runtimedatathatdoesn'trequireon-diskstorage.

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Multi-tierobjectsharingFacilitatesharingofdatainmulti-tier/multi-languageapplications.

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ApplicationtestingReduceturnaroundtimeforautomatedapplicationtests.

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SophisticateddatamanipulationIncreaseperformancefordatamanipulationoperationssuchasaggregationandmapreduction.

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Real-timeAnalyticsUsesin-memorycomputinginsituationswhereresponsetimeismorecriticalthanpersistence.

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MemoryEnginedeployments

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• Fortestinganddevelopment• Usefulforsizingandquickresets• NoRedundancy• NoPersistence• Limitedtoserversize

Standalone

PSMDB Memory

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./mongod --storageEngine inMemory -–dbpath /data/db -–inMemorySizeGB 150

Standaloneconfig

PSMDB Memory

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• Forproduction• Failovercapability• Dataredundancy• NoPersistence• Readscaling

ReplicaSet- Memory

PSMDB Memory

primary secondary

secondary

PSMDB Memory

PSMDB Memory

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ReplicaSet- config

PSMDB Memory

primary secondary

secondary

PSMDB Memory

PSMDB Memory

./mongod --storageEngine inMemory -–dbpath /data/db -–inMemorySizeGB 150 --replSet repSet1

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• Forproduction• Failovercapability• Dataredundancy• DataPersistence• Readscaling• Configurepermanentmemberasahiddenmember(i.e.hidden:trueandpriority:0)

ReplicaSet– withPersistentOption

PSMDB Memory

primary secondary

secondary

PSMDB Memory

PSMDB wiredTiger or MongoRocks

Permanentstorage

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Replicatesetwithpermanentoption• Onlythemongod instancesrunningwiththeMemorystorage

enginecanbecometheprimary.• ClientsconnectonlytotheMemorystorageenginemongod

instances.• Evenifbothmongod instancesrunningMemorystorageengine

crashandrestart,theycansyncfromthememberrunningpermanentstorageengine.

• Thehiddenmongod instancerunningwithpermanentstoragepersiststhedatatodisk,includingtheuserdata,indexes,andreplicationconfigurationinformation.

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Sharding – scalingformorememory

PSMDB Memory PSMDB Memory

mongos

Shard by id

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Sharding – scalingmongos

Shard by id

PSMDB Memory

primary secondary

secondary PSMDB Memory


PSMDB Memory

primary secondary

secondary PSMDB Memory


• Forproduction• Failovercapability• Dataredundancy• DataPersistence• Write scaling

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PSMDBextras

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• Dataretrievalbydocumentfields

PSMDB– secondaryindexes{"_id“ : “Vadim”,“visits“ : 45,”created“ : ISODate("2016-01-07T15:46:32.085Z”)

}

> db.coll.ensureIndex({visits:1});> db.coll.find({visits : {$gte :40}});

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• Toremovedataautomatically

PSMDB– TTLindexes{"_id“ : “Vadim”,“visits“ : 45,”created“ : ISODate("2016-01-07T15:46:32.085Z”)

}

> db.coll.createIndex({"created": 1},{expireAtferSeconds: 7200 });

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Morefeatures• Authentication• IncludingExternalSASLAuthentication• Role-BasedAccessControl• Auditlogging• GeospatialIndexes• TextSearch

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PSMDBMemoryEngine- summary

StoreType DocumentStore

Failover/HA ReplicaSet

Scaling Sharding

Persistence ExtraReplicawithwiredTiger orMongoRocks

CRUD Insert,find,update,remove

Expiredata TTL

Concurrency Multi-threading

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Scalability– MultiThreading• Intel(R)Xeon(R)[email protected]/56

threads• 256GBRAM• Sysbench 1.0witholtp_mongo.lua• Availableathttps://github.com/Percona-Lab/sysbench-mongodb-lua• 100GBdataset• Userthreadsfrom1to128• Operation:OLTPevent

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Stability– MultiThreading• Intel(R)Xeon(R)[email protected]/56

threads• 256GBRAM• Sysbench 1.0witholtp_mongo.lua• Availableatgithub.com/percona-labs• 100GBdataset• Userthreads256• Operation:OLTPevent

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PMM• NewsoftwarefromPercona• Freeandopen-sourceplatformformanagingandmonitoring

MySQL® andMongoDB® performance.• YoucanrunPMMinyourownenvironment• Providesthoroughtime-basedanalysisforMySQL,MariaDB® and

MongoDBserverstoensurethatyourdataworksasefficientlyaspossible.

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PMMbenefits• Providesqueryandmetricinformationthatenables

administratorstooptimizedatabaseperformance• Displayscurrentqueriesandhighlightspotentialqueryissuesto

enablefasterissueresolution• Mapsqueriesagainstmetricstohelpmakeinformeddecisions

aboutcrucialdatabaseresources:platformneeds,systemgrowth,teamfocusandthemostimportantdatabaseactivities

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PMMfeatures• Point-in-timevisibilityandhistoricaltrendingofdatabase

performance• DatafromtheMongoDBqueryprofiler• SpecializedMongoDBdashboardsforgraphingMMAPv1,InMemory,

MongoRocks• Ahistoricalviewofmetricsthatarecriticaltoadatabaseserver• Querymetrics,includingbytessent,locktime,rowssent,andmore• Best-of-breedtools,includingGrafana,Prometheus,andConsul,as

wellasPercona-developedqueryanalytics,administration,API,agentandexportercomponents

• Asingle,easytomanagevirtualappliance

Gain a MongoDB Advantage with the Percona Memory Engine...• Data from the MongoDB query profiler...

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