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Administering and Monitoring SolrCloud Clusters


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Presented by Rafal Kuć, Consultant and Software engineer, , Sematext Group, Inc.

Even though Solr can run without causing any troubles for long periods of time it is very important to monitor and understand what is happening in your cluster. In this session you will learn how to use various tools to monitor how Solr is behaving at a high level, but also on Lucene, JVM, and operating system level. You'll see how to react to what you see and how to make changes to configuration, index structure and shards layout using Solr API. We will also discuss different performance metrics to which you ought to pay extra attention. Finally, you'll learn what to do when things go awry - we will share a few examples of troubleshooting and then dissect what was wrong and what had to be done to make things work again.

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Administering and Monitoring SolrCloud Clusters

  1. 1. Administering and Monitoring SolrCloud Rafał  Kuć  – Sematext Group, Inc. @kucrafal @sematext
  2. 2. Ta  me… Sematext consultant & engineer co-founder Father and husband 
  3. 3. SolrCloud Concepts Shard1 Replica Shard2 Replica Solr Server Solr Server Shard2 Shard1 Solr Server Solr Server Application
  4. 4. Local SolrCloud Cluster java -Dbootstrap_confdir=./solr/revolution/conf -Dcollection.configName=revolution -DzkRun -DnumShards=1 -jar start.jar Runs embedded ZooKeeper Bootstraps collection with 1 shards Starts Solr
  5. 5. Starting Solr Cluster No Collection No Collection -DzkHost=,, Solr Server -DzkHost=,, Solr Server No Collection No Collection -DzkHost=,, -DzkHost=,, Solr Server ZooKeeper ZooKeeper ZooKeeper Solr Server
  6. 6. Uploading Collection Configuration ./ -cmd upconfig -zkhost -confdir ./conf/ -confname revolution ZooKeeper Collection configuration ZooKeeper ZooKeeper Solr
  7. 7. Collections API Create Delete Reload Split Create Alias Delete Alias Shard Creation/Deletion
  8. 8. Collection Creation curl 'http://solrhost:8983/solr/admin/collections?action=CREATE &name=revolution&numShards=3&replicationFactor=4' name numShards replicationFactor maxShardsPerNode createNodeSet collection.configName
  9. 9. Collection Split Example $ curl 'http://solr1:8983/solr/admin/collections?action=CREATE& name=collection1&numShards=2&replicationFactor=1'
  10. 10. Collection Split Example $ curl 'http://localhost:8983/solr/admin/collections? action=SPLITSHARD&collection=collection1&shard=shard1'
  11. 11. Getting Deeper – CoreAdmin API curl 'http://solrhost:8983/solr/admin/cores?action=CREATE &name=newcore&collection=revolution&shard=shard2' collection shard numShards collection.configName
  12. 12. Schema – the API Reading (Solr 4.2) Fields Dynamic fields Types Copy fields Name (4.3) Version (4.3) Unique Key (4.3) Similarity (4.3) Writing (Solr 4.4) Adding new fields Adding copy fields
  13. 13. Reading Your Schema curl -XGET 'http://solrhost:8983/solr/rev/schema/fields/name' { "responseHeader" : { "status" : 0, "QTime" : 5 }, "field" : { "name" : "name", "type" : "text_general", "indexed" : true, "stored" : true } } Full reference:
  14. 14. Dynamic Schema Modifications <schemaFactory class="ManagedIndexSchemaFactory"> <bool name="mutable">true</bool> <str name="managedSchemaResourceName">managed-schema</str> </schemaFactory> curl -XPUT 'http://solrhost:8983/solr/rev/schema/fields/content' –d '{ "type" : "text", "stored" : "false", "copyFields" : ["catchAll"] }' curl -XPOST 'http://solrhost:8983/solr/rev/schema/copyFields' -d '[ { "source" : "name", "dest" : [ "text", "personal" ] } ]'
  15. 15. The Right Directory StandardDirectory SimpleFSDirectory NIOFSDirectory MMapDirectory _0.fdt _0.fdx _0.fnm _0.nvd _1.fdt _1.fdx _1.fnm _1.nvd NRTCachingDirectory RAMDirectory <directoryFactory name="DirectoryFactory" class="solr.NRTCachingDirectoryFactory" />
  16. 16. Segment Merging Level 0 a b f Level 1 c c d e g
  17. 17. Segment Merge Under Control Merge policy Merge scheduler Merge factor Merge policy configuration
  18. 18. Autocommit or Not? Automatic data flush (hard commit) Automatic index view refresh <autoCommit> <maxTime>15000</maxTime> <maxDocs>1000</maxDocs> <openSearcher>false</openSearcher> </autoCommit> <autoSoftCommit> <maxTime>1000</maxTime> </autoSoftCommit>
  19. 19. Caches Refreshed with IndexSearcher Configurable Different purposes Different implementations Solr Cache
  20. 20. Monitoring Importance
  21. 21. What to Pay Attention to?
  22. 22. Cluster State Health Shards and replica status Shard placement Failing nodes
  23. 23. Indexing Related Metrics Index throughput Document distribution I/O subsystem metrics Merging
  24. 24. Search - related Metrics Count Latency Distribution among nodes Anomalies and spikes
  25. 25. Monitoring Memory and GC Heap details Pool size Pool utilization Garbage collection count Garbage collection time
  26. 26. Monitoring OS Related Metrics CPU details Load I/O activity Network usage
  27. 27. Solr Administration Panel
  28. 28. Solr & JMX <jmx /> java –jar start.jar
  29. 29. Solr & JMX
  30. 30. SPM Index statistics Request # and latency Caches and warmup CPU JVM Memory and OS Memory Garbage collector OS related statistics
  31. 31. SPM Dashboard
  32. 32. Other Monitoring Tools Ganglia New Relic Opsview
  33. 33. Too much is too much
  34. 34. Too hot
  35. 35. Caches
  36. 36. We Are Hiring ! Dig Search ? Dig Analytics ? Dig Big Data ? Dig Performance ? Dig working with and in open – source ? We’re hiring world – wide !
  37. 37. Thank You ! Rafał  Kuć   @kucrafal Sematext @sematext SPM discount code: LR2013SPM20 @ Sematext booth ;)