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https://issues.apache.org/jira/browse/SOLR-7121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14328979#comment-14328979
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Shawn Heisey commented on SOLR-7121:
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bq. Some users will have an aweful lot of cores.
My primary Solr install has 32 Solr cores, and only 8 CPU cores. Each server
is using a different subset of those 32 cores - they are not all in use. I
would most definitely prefer not to have 32 additional actively running threads
-- there aren't enough CPUs.
My Solr install, despite the number of cores, documents, and total index size
(over 100GB), is *tiny* compared to some of what's out there. When Erick
started working on LotsOfCores functionality so that Solr can scale to
thousands of cores on a single server and still perform well, that was most
definitely not theoretical work.
> Solr nodes should go down based on configurable thresholds and not rely on
> resource exhaustion
> ----------------------------------------------------------------------------------------------
>
> Key: SOLR-7121
> URL: https://issues.apache.org/jira/browse/SOLR-7121
> Project: Solr
> Issue Type: New Feature
> Reporter: Sachin Goyal
> Attachments: SOLR-7121.patch, SOLR-7121.patch
>
>
> Currently, there is no way to control when a Solr node goes down.
> If the server is having high GC pauses or too many threads or is just getting
> too many queries due to some bad load-balancer, the cores in the machine keep
> on serving unless they exhaust the machine's resources and everything comes
> to a stall.
> Such a slow-dying core can affect other cores as well by taking huge time to
> serve their distributed queries.
> There should be a way to specify some threshold values beyond which the
> targeted core can its ill-health and proactively go down to recover.
> When the load improves, the core should come up automatically.
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