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Date: Tue, 2 Dec 2008 11:22:44 -0800 (PST)
From: "Raghu Angadi (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-4679) Datanode prints tons of log
 messages: Waiting for threadgroup to exit, active theads is XX
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    [ https://issues.apache.org/jira/browse/HADOOP-4679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12652467#action_12652467 ] 

Raghu Angadi commented on HADOOP-4679:
--------------------------------------


# writeToBlock() creates files in two places. The patch catches only one of them.
# There is inherent requirement that shutdown() should only be called from offerService thread. It would be better if JavaDoc for shutdown() says this explicitly.  Otherwise, this deadlock and logging in tight infinite loop could occur again with future changes.

> Datanode prints tons of log messages: Waiting for threadgroup to exit, active theads is XX
> ------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-4679
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4679
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>         Attachments: diskError.patch, diskError1.patch, diskError2.patch
>
>
> When a data receiver thread sees a disk error, it immediately calls shutdown to shutdown DataNode. But the shutdown method does not return before all data receiver threads exit, which will never happen. Therefore the DataNode gets into a dead/live lock state, emitting tons of log messages: Waiting for threadgroup to exit, active threads is XX.

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