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https://issues.apache.org/jira/browse/SOLR-11771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16296011#comment-16296011
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Cao Manh Dat commented on SOLR-11771:
-------------------------------------

[~dsmiley] Only since SOLR-11443 get committed so only 7.2 get affected.

> Overseer can never process some last messages
> ---------------------------------------------
>
>                 Key: SOLR-11771
>                 URL: https://issues.apache.org/jira/browse/SOLR-11771
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Cao Manh Dat
>
> I met this problem when some tests get failed because timeout on creating a 
> new collection. The case here is
> 1. Overseer call DQ.peekElements with LONG.MAX_VALUE timeout.
> 2. DQ fetch children from ZK but it is empty.
> 3. At the same time with 2, a set LEADER message is enqueued, 
> {{changed.signalAll()}} already called.
> 4. The call {{changed.awaitNanos(waitNanos)}} is never end because no new 
> messages get enqueued after this point.
> The fix here is trivial, the call peekElements should have a timeout of 2 
> seconds, that will be appropriate in most cases.



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