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Posted to common-dev@hadoop.apache.org by "Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org> on 2008/02/27 02:52:51 UTC

[jira] Commented: (HADOOP-2907) dead datanodes because of OutOfMemoryError

    [ https://issues.apache.org/jira/browse/HADOOP-2907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12572757#action_12572757 ] 

Tsz Wo (Nicholas), SZE commented on HADOOP-2907:
------------------------------------------------

One easy improvement: The class of DataNode.childSockets should be Set or Hashtable, instead Map.

> dead datanodes because of OutOfMemoryError
> ------------------------------------------
>
>                 Key: HADOOP-2907
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2907
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.16.0
>            Reporter: Christian Kunz
>
> We see more dead datanodes than in previous releases. The common exception is found in the out file:
> Exception in thread "org.apache.hadoop.dfs.DataBlockScanner@18166e5" java.lang.OutOfMemoryError: Java heap space
> Exception in thread "DataNode: [dfs.data.dir-value]" java.lang.OutOfMemoryError: Java heap space

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