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https://issues.apache.org/jira/browse/SOLR-5473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14132126#comment-14132126
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Jessica Cheng Mallet commented on SOLR-5473:
--------------------------------------------

Hey guys, under heavy load-testing yesterday with this 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.



> Split clusterstate.json per collection and watch states selectively 
> --------------------------------------------------------------------
>
>                 Key: SOLR-5473
>                 URL: https://issues.apache.org/jira/browse/SOLR-5473
>             Project: Solr
>          Issue Type: Sub-task
>          Components: SolrCloud
>            Reporter: Noble Paul
>            Assignee: Noble Paul
>              Labels: SolrCloud
>             Fix For: 4.10, 5.0
>
>         Attachments: SOLR-5473-74 .patch, SOLR-5473-74.patch, 
> SOLR-5473-74.patch, SOLR-5473-74.patch, SOLR-5473-74.patch, 
> SOLR-5473-74.patch, SOLR-5473-74.patch, SOLR-5473-74.patch, 
> SOLR-5473-74.patch, SOLR-5473-74.patch, SOLR-5473-74.patch, 
> SOLR-5473-74.patch, SOLR-5473-74.patch, SOLR-5473-74.patch, 
> SOLR-5473-74.patch, SOLR-5473-74.patch, SOLR-5473-74.patch, 
> SOLR-5473-74.patch, SOLR-5473-74.patch, SOLR-5473-74.patch, 
> SOLR-5473-74.patch, SOLR-5473-74.patch, SOLR-5473-74.patch, 
> SOLR-5473-74.patch, SOLR-5473-74.patch, SOLR-5473-74.patch, 
> SOLR-5473-74.patch, SOLR-5473-74.patch, SOLR-5473-74.patch, 
> SOLR-5473-74.patch, SOLR-5473-74.patch, SOLR-5473-74.patch, 
> SOLR-5473-74.patch, SOLR-5473-74.patch, SOLR-5473-74_POC.patch, 
> SOLR-5473-configname-fix.patch, SOLR-5473.patch, SOLR-5473.patch, 
> SOLR-5473.patch, SOLR-5473.patch, SOLR-5473.patch, SOLR-5473.patch, 
> SOLR-5473.patch, SOLR-5473.patch, SOLR-5473.patch, SOLR-5473.patch, 
> SOLR-5473.patch, SOLR-5473.patch, SOLR-5473.patch, SOLR-5473.patch, 
> SOLR-5473.patch, SOLR-5473.patch, SOLR-5473.patch, SOLR-5473.patch, 
> SOLR-5473.patch, SOLR-5473.patch, SOLR-5473_no_ui.patch, 
> SOLR-5473_undo.patch, ec2-23-20-119-52_solr.log, ec2-50-16-38-73_solr.log
>
>
> As defined in the parent issue, store the states of each collection under 
> /collections/collectionname/state.json node and watches state changes 
> selectively.
> https://reviews.apache.org/r/24220/



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