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From "Gabriel Reid (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-14331) HadoopScheduledThreadPoolExecutor broken for periodic task running
Date Thu, 20 Apr 2017 08:14:04 GMT
Gabriel Reid created HADOOP-14331:

             Summary: HadoopScheduledThreadPoolExecutor broken for periodic task running
                 Key: HADOOP-14331
                 URL: https://issues.apache.org/jira/browse/HADOOP-14331
             Project: Hadoop Common
          Issue Type: Bug
          Components: common
    Affects Versions: 3.0.0-alpha3
            Reporter: Gabriel Reid

The HadoopScheduledThreadPoolExecutor (introduced in HADOOP-12749) is broken for the scheduling
of periodic tasks (i.e. for tasks submitted with {{scheduleAtFixedRate}} and {{scheduleAfterFixedDelay}}).

The behavior of the executor with these methods is that the underlying task is executed once,
and then blocks the running thread indefinitely in {{ExecutorHelper::logThrowableFromAfterExecute}},
meaning further executions of the task won't run, and will also block the running thread from
running any other tasks.

A quick scan of the source has shown me that these methods are used on HadoopScheduledThreadPoolExecutor
instances in several places in the code base, at least in {{JobHistory}} and {{CleanerService}},
which appears to mean that these classes also no longer function correctly.

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