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https://issues.apache.org/jira/browse/SOLR-7129?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Noble Paul reassigned SOLR-7129:
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Assignee: Noble Paul
> CloudSolrClient can put excessive load on ZooKeeper for collections with
> stateFormat=2
> --------------------------------------------------------------------------------------
>
> Key: SOLR-7129
> URL: https://issues.apache.org/jira/browse/SOLR-7129
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud, SolrJ
> Affects Versions: 5.0
> Reporter: Shalin Shekhar Mangar
> Assignee: Noble Paul
> Labels: difficulty-medium, impact-high
> Fix For: Trunk, 5.1
>
>
> Each stale state response from the server causes CloudSolrClient to evict the
> requested collection from the local cache. At this point, the request is
> retried and the latest collection state is fetched live from ZooKeeper. There
> is nothing preventing multiple request threads to simultaneously hit
> ZooKeeper and cause a thundering herd effect.
> We must not only synchronise such refreshes but also use the past and current
> znode version of the cluster state to make sure that redundant fetches from
> ZooKeeper are never possible.
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