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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10713) Throttle FsNameSystem lock warnings
Date Sat, 17 Sep 2016 04:13:21 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15498130#comment-15498130
] 

Arpit Agarwal commented on HDFS-10713:
--------------------------------------

v10 patch lgtm. I think this block was left in by mistake in the second do-while loop in readUnlock,
it can be removed.

{code}
        localLongestReadLock = longestReadLockHeldInterval.get();
        if (readLockInterval > localLongestReadLock) {
          longestReadLockHeldInterval.compareAndSet(
              localLongestReadLock, readLockInterval);
        }
{code}

Will hold off committing until next week in case Chris, Erik or others have additional comments.

> Throttle FsNameSystem lock warnings
> -----------------------------------
>
>                 Key: HDFS-10713
>                 URL: https://issues.apache.org/jira/browse/HDFS-10713
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: logging, namenode
>            Reporter: Arpit Agarwal
>            Assignee: Hanisha Koneru
>         Attachments: HDFS-10713.000.patch, HDFS-10713.001.patch, HDFS-10713.002.patch,
HDFS-10713.003.patch, HDFS-10713.004.patch, HDFS-10713.005.patch, HDFS-10713.006.patch, HDFS-10713.007.patch,
HDFS-10713.008.patch, HDFS-10713.009.patch, HDFS-10713.010.patch
>
>
> The NameNode logs a message if the FSNamesystem write lock is held by a thread for over
1 second. These messages can be throttled to at one most one per x minutes to avoid potentially
filling up NN logs. We can also log the number of suppressed notices since the last log message.



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