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https://issues.apache.org/jira/browse/SOLR-6521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14287240#comment-14287240
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ASF subversion and git services commented on SOLR-6521:
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Commit 1653805 from [~noble.paul] in branch 'dev/branches/branch_5x'
[ https://svn.apache.org/r1653805 ]
SOLR-6521 CloudSolrServer should synchronize cache cluster state loading
> CloudSolrClient should synchronize cache cluster state loading
> --------------------------------------------------------------
>
> Key: SOLR-6521
> URL: https://issues.apache.org/jira/browse/SOLR-6521
> Project: Solr
> Issue Type: Improvement
> Components: SolrCloud
> Reporter: Jessica Cheng Mallet
> Assignee: Noble Paul
> Priority: Critical
> Labels: SolrCloud
> Fix For: 5.0, Trunk
>
> Attachments: SOLR-6521.patch, SOLR-6521.patch
>
>
> Under heavy load-testing with the new solrj client that caches the cluster
> state instead of setting a watcher, I started seeing lots of zk connection
> loss on the client-side when refreshing the CloudSolrServer
> collectionStateCache, and this was causing crazy client-side 99.9% latency
> (~15 sec). I swapped the cache out with guava's LoadingCache (which does
> locking to ensure only one thread loads the content under one key while the
> other threads that want the same key wait) and the connection loss went away
> and the 99.9% latency also went down to just about 1 sec.
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