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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5140) Too many safemode monitor threads being created in the standby namenode causing it to fail with out of memory error
Date Thu, 29 Aug 2013 23:49:53 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13754216#comment-13754216
] 

Suresh Srinivas commented on HDFS-5140:
---------------------------------------

smmthread should be set to null in SafemodeMonitor holding the writeLock.
                
> Too many safemode monitor threads being created in the standby namenode causing it to
fail with out of memory error
> -------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-5140
>                 URL: https://issues.apache.org/jira/browse/HDFS-5140
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: ha
>    Affects Versions: 2.1.0-beta
>            Reporter: Arpit Gupta
>            Assignee: Jing Zhao
>            Priority: Blocker
>         Attachments: HDFS-5140.001.patch
>
>
> While running namenode load generator with 100 threads for 10 mins namenode was being
failed over ever 2 mins.
> The standby namenode shut itself down as it ran out of memory and was not able to create
another thread.
> When we searched for 'Safe mode extension entered' in the standby log it was present
55000+ times

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