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

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

Cao Manh Dat created SOLR-11771:
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             Summary: 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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