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https://issues.apache.org/jira/browse/SOLR-17106?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17823566#comment-17823566
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Aparna Suresh commented on SOLR-17106:
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Hi [~hossman] , can you please provide your feedback on the requested changes?
Thanks
> LBSolrClient: Make it configurable to remove zombie ping checks
> ---------------------------------------------------------------
>
> Key: SOLR-17106
> URL: https://issues.apache.org/jira/browse/SOLR-17106
> Project: Solr
> Issue Type: Improvement
> Reporter: Aparna Suresh
> Priority: Minor
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Following discussion from a dev list discussion here:
> [https://lists.apache.org/thread/f0zfmpg0t48xrtppyfsmfc5ltzsq2qqh]
> The issue involves scalability challenges in SolrJ's *LBSolrClient* when a
> pod with numerous cores experiences connectivity problems. The "zombie"
> tracking mechanism, operating on a core basis, becomes a bottleneck during
> distributed search on a massive multi shard collection. Threads attempting to
> reach unhealthy cores contribute to a high computational load, causing
> performance issues.
> As suggested by Chris Hostetter: LBSolrClient could be configured to disable
> zombie "ping" checks, but retain zombie tracking. Once a replica/endpoint is
> identified as a zombie, it could be held in zombie jail for X seconds, before
> being released - hoping that by this timeframe ZK would be updated to mark
> this endpoint DOWN or the pod is back up and CloudSolrClient would avoid
> querying it. In any event, only 1 failed query would be needed to send the
> server back to zombie jail.
>
> There are benefits in doing this change:
> * Eliminate the zombie ping requests, which would otherwise overload pod(s)
> coming up after a restart
> * Avoid memory leaks, in case a node/replica goes away permanently, but it
> stays as zombie forever, with a background thread in LBSolrClient constantly
> pinging it
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