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From "Maxim Khutornenko (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AURORA-1459) DelayExecutor is flaky within scheduling loop
Date Sat, 29 Aug 2015 20:07:45 GMT
Maxim Khutornenko created AURORA-1459:
-----------------------------------------

             Summary: DelayExecutor is flaky within scheduling loop
                 Key: AURORA-1459
                 URL: https://issues.apache.org/jira/browse/AURORA-1459
             Project: Aurora
          Issue Type: Bug
          Components: Scheduler
            Reporter: Maxim Khutornenko


TaskGroups now uses DelayExecutor introduced to gate async operations. The problem though
is that DelayExecutor queue is only flushed on DB transaction completion (1). This means no
scheduling can ever proceed unless there is _some_ storage mutation activity. If/when there
are no storage writes scheduling effectively halts. 

While it unlikely to happen in production, it is consistently reproducible with e2e tests
in vagrant on any subsequent run.


(1) - https://github.com/apache/aurora/blob/06ddaadbcba4c66b8019815de6ca27d50a9df77d/src/main/java/org/apache/aurora/scheduler/storage/db/DbStorage.java#L175-L178



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