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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10713) Throttle FsNameSystem lock warnings
Date Wed, 31 Aug 2016 11:35:22 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15451986#comment-15451986
] 

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

Thanks [~hanishakoneru]. The patch lgtm. The test case needs fixing.

In TestFsNameSystem.java:
# Line 319 - the assertFalse should be assertTrue. Also the comment on line 313 should be
fixed.
# Line 308 - the sleep can be removed.

We can also change the writeLockReportingThreshold to 1 millisecond to cut down the test run
time.

> 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
>
>
> 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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