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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Work started] (HDFS-5922) DN heartbeat thread can get stuck in tight loop
Date Mon, 10 Feb 2014 22:55:22 GMT

     [ https://issues.apache.org/jira/browse/HDFS-5922?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Work on HDFS-5922 started by Arpit Agarwal.

> DN heartbeat thread can get stuck in tight loop
> -----------------------------------------------
>
>                 Key: HDFS-5922
>                 URL: https://issues.apache.org/jira/browse/HDFS-5922
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>    Affects Versions: 2.3.0
>            Reporter: Aaron T. Myers
>            Assignee: Arpit Agarwal
>
> We saw an issue recently on a test cluster where one of the DN threads was consuming
100% of a single CPU. Running jstack indicated that it was the DN heartbeat thread. I believe
I've tracked down the cause to a bug in the accounting around the value of {{pendingReceivedRequests}}.
> More details in the first comment.



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