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https://issues.apache.org/jira/browse/SOLR-8327?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ishan Chattopadhyaya updated SOLR-8327:
---------------------------------------
    Attachment: SOLR-8327.patch

> SolrDispatchFilter is not caching new state format, which results in live 
> fetch from ZK per request if node does not contain core from collection
> -------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: SOLR-8327
>                 URL: https://issues.apache.org/jira/browse/SOLR-8327
>             Project: Solr
>          Issue Type: Bug
>          Components: SolrCloud
>    Affects Versions: 5.3
>            Reporter: Jessica Cheng Mallet
>            Assignee: Ishan Chattopadhyaya
>            Priority: Major
>              Labels: solrcloud
>         Attachments: SOLR-8327.patch, SOLR-8327.patch
>
>
> While perf testing with non-solrj client (request can be sent to any solr 
> node), we noticed a huge amount of data from Zookeeper in our tcpdump (~1G 
> for 20 second dump). From the thread dump, we noticed this:
> java.lang.Object.wait (Native Method)
> java.lang.Object.wait (Object.java:503)
> org.apache.zookeeper.ClientCnxn.submitRequest (ClientCnxn.java:1309)
> org.apache.zookeeper.ZooKeeper.getData (ZooKeeper.java:1152)
> org.apache.solr.common.cloud.SolrZkClient$7.execute (SolrZkClient.java:345)
> org.apache.solr.common.cloud.SolrZkClient$7.execute (SolrZkClient.java:342)
> org.apache.solr.common.cloud.ZkCmdExecutor.retryOperation 
> (ZkCmdExecutor.java:61)
> org.apache.solr.common.cloud.SolrZkClient.getData (SolrZkClient.java:342)
> org.apache.solr.common.cloud.ZkStateReader.getCollectionLive 
> (ZkStateReader.java:841)
> org.apache.solr.common.cloud.ZkStateReader$7.get (ZkStateReader.java:515)
> org.apache.solr.common.cloud.ClusterState.getCollectionOrNull 
> (ClusterState.java:175)
> org.apache.solr.common.cloud.ClusterState.getLeader (ClusterState.java:98)
> org.apache.solr.servlet.HttpSolrCall.getCoreByCollection 
> (HttpSolrCall.java:784)
> org.apache.solr.servlet.HttpSolrCall.init (HttpSolrCall.java:272)
> org.apache.solr.servlet.HttpSolrCall.call (HttpSolrCall.java:417)
> org.apache.solr.servlet.SolrDispatchFilter.doFilter 
> (SolrDispatchFilter.java:210)
> org.apache.solr.servlet.SolrDispatchFilter.doFilter 
> (SolrDispatchFilter.java:179)
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter 
> (ServletHandler.java:1652)
> org.eclipse.jetty.servlet.ServletHandler.doHandle (ServletHandler.java:585)
> org.eclipse.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:143)
> org.eclipse.jetty.security.SecurityHandler.handle (SecurityHandler.java:577)
> org.eclipse.jetty.server.session.SessionHandler.doHandle 
> (SessionHandler.java:223)
> org.eclipse.jetty.server.handler.ContextHandler.doHandle 
> (ContextHandler.java:1127)
> org.eclipse.jetty.servlet.ServletHandler.doScope (ServletHandler.java:515)
> org.eclipse.jetty.server.session.SessionHandler.doScope 
> (SessionHandler.java:185)
> org.eclipse.jetty.server.handler.ContextHandler.doScope 
> (ContextHandler.java:1061)
> org.eclipse.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:141)
> org.eclipse.jetty.server.handler.ContextHandlerCollection.handle 
> (ContextHandlerCollection.java:215)
> org.eclipse.jetty.server.handler.HandlerCollection.handle 
> (HandlerCollection.java:110)
> org.eclipse.jetty.server.handler.HandlerWrapper.handle 
> (HandlerWrapper.java:97)
> org.eclipse.jetty.server.Server.handle (Server.java:499)
> org.eclipse.jetty.server.HttpChannel.handle (HttpChannel.java:310)
> org.eclipse.jetty.server.HttpConnection.onFillable (HttpConnection.java:257)
> org.eclipse.jetty.io.AbstractConnection$2.run (AbstractConnection.java:540)
> org.eclipse.jetty.util.thread.QueuedThreadPool.runJob 
> (QueuedThreadPool.java:635)
> org.eclipse.jetty.util.thread.QueuedThreadPool$3.run 
> (QueuedThreadPool.java:555)
> java.lang.Thread.run (Thread.java:745)
> Looks like SolrDispatchFilter doesn't have caching similar to the 
> collectionStateCache in CloudSolrClient, so if the node doesn't know about a 
> collection in the new state format, it just live-fetch it from Zookeeper on 
> every request.



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