[jira] [Updated] (SOLR-11771) Overseer can never process some last messages

["Cao Manh Dat (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-11771?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Cao Manh Dat updated SOLR-11771:
--------------------------------
    Summary: Overseer can never process some last messages  (was: Overseer can never process some last messages due to a bug in DQ.peekElements())

> 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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