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From "Hanisha Koneru (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-10713) Throttle FsNameSystem lock warnings
Date Fri, 16 Sep 2016 00:28:21 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10713?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hanisha Koneru updated HDFS-10713:
----------------------------------
    Attachment: HDFS-10713.007.patch

Thanks [~xkrogen], [~chris.douglas] and [~andrew.wang] for the review and comments. I have
updated the patch with the following changes:
1. Using Timer.MonoticNow() instead of Time.MonotonicNow() to avoid sleeping in tests.
2. Replaced synchronized block in readUnlock() with logic from HDFS-10742 to avoid using locks.

> 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
>
>
> 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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