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From "Yu Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14891) Add log for uncaught exception in RegionServerMetricsWrapperRunnable
Date Fri, 27 Nov 2015 06:59:10 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15029529#comment-15029529
] 

Yu Li commented on HBASE-14891:
-------------------------------

Thanks for the note [~chenheng], it's by purpose to show the change more clearly. Let me upload
another one following code format. :-)

> Add log for uncaught exception in RegionServerMetricsWrapperRunnable
> --------------------------------------------------------------------
>
>                 Key: HBASE-14891
>                 URL: https://issues.apache.org/jira/browse/HBASE-14891
>             Project: HBase
>          Issue Type: Improvement
>          Components: metrics
>            Reporter: Yu Li
>            Assignee: Yu Li
>            Priority: Minor
>         Attachments: HBASE-14891.patch
>
>
> We are using ScheduledExecutorService#scheduleWithFixedDelay to periodically reporting
metrics. From javadoc of this method
> {quote}
> If any execution of the task encounters an exception, subsequent executions are suppressed.
> {quote}
> We could see if any uncaught exception like NPE thrown in the task thread, there won't
be any error thrown but the task would be silently terminated.
> In our real case we were making some modification to the metrics and causing NPE carelessly,
then we found metrics disappeared but cannot get a clue from RS log.
> Suggest to catch Throwable in MetricsRegionServerWrapperImpl$RegionServerMetricsWrapperRunnable,
add some log there and suppress the exception to give it another try at next scheduled run.



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