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From "Hanisha Koneru (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10713) Throttle FsNameSystem lock warnings
Date Thu, 01 Sep 2016 00:14:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15453832#comment-15453832
] 

Hanisha Koneru commented on HDFS-10713:
---------------------------------------

We can cache the thread's stackTrace and lock time and once a new thread lock warning is encountered,
we can log the report for the previous thread. This way all thread's information will be preserved.

> 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
>
>
> 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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