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https://issues.apache.org/jira/browse/SOLR-11423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16188866#comment-16188866
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ASF GitHub Bot commented on SOLR-11423:
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GitHub user dragonsinth opened a pull request:
https://github.com/apache/lucene-solr/pull/256
SOLR-11423: Overseer queue needs a hard cap (maximum size) that clients
respect
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/apache/lucene-solr SOLR-11423
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/lucene-solr/pull/256.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #256
----
commit ef8e0934fb27530f0c9450b58872b2b11028f50a
Author: Scott Blum <dragonsi...@apache.org>
Date: 2017-10-02T20:50:57Z
SOLR-11423: Overseer queue needs a hard cap (maximum size) that clients
respect
----
> Overseer queue needs a hard cap (maximum size) that clients respect
> -------------------------------------------------------------------
>
> Key: SOLR-11423
> URL: https://issues.apache.org/jira/browse/SOLR-11423
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Reporter: Scott Blum
> Assignee: Scott Blum
>
> When Solr gets into pathological GC thrashing states, it can fill the
> overseer queue with literally thousands and thousands of queued state
> changes. Many of these end up being duplicated up/down state updates. Our
> production cluster has gotten to the 100k queued items level many times, and
> there's nothing useful you can do at this point except manually purge the
> queue in ZK. Recently, it hit 3 million queued items, at which point our
> entire ZK cluster exploded.
> I propose a hard cap. Any client trying to enqueue a item when a queue is
> full would throw an exception. I was thinking maybe 10,000 items would be a
> reasonable limit. Thoughts?
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