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Posted to common-issues@hadoop.apache.org by "Gabriel Reid (JIRA)" <ji...@apache.org> on 2017/04/20 08:14:04 UTC
[jira] [Created] (HADOOP-14331) HadoopScheduledThreadPoolExecutor
broken for periodic task running
Gabriel Reid created HADOOP-14331:
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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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