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From "Scott Blum (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-11423) Overseer queue needs a hard cap (maximum size) that clients respect
Date Mon, 02 Oct 2017 21:23:00 GMT

    [ https://issues.apache.org/jira/browse/SOLR-11423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16188867#comment-16188867
] 

Scott Blum commented on SOLR-11423:
-----------------------------------

[~noble.paul] I went with 20k.  We could make it configurable, but again, I intend this to
be a general purpose safety valve to protect Zookeeper from exploding, which makes me think
we could pick a universal value.

> 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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