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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4672) RPC on Datanode blocked forever.
Date Mon, 17 Nov 2008 23:11:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12648406#action_12648406
] 

Raghu Angadi commented on HADOOP-4672:
--------------------------------------

The above trace is for hadoop 0.17.


> RPC on Datanode blocked forever.
> --------------------------------
>
>                 Key: HADOOP-4672
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4672
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs, io
>    Affects Versions: 0.17.0
>         Environment: Java SE 1.6.0-b105 on Linux 2.6.x
>            Reporter: Raghu Angadi
>
> We recently noticed a number of datanodes got stuck. The main thread that sends heartbeats
and block reports is blocked in select() in side blockReport() RPC.  I will add a stack trace
in the next comment.
> I am not sure why select was blocked forever since there is no connection open to NameNode.
In fact, NN was restarted in between. It could be some JDK bug or a Hadoop bug.

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