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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2907) dead datanodes because of OutOfMemoryError
Date Thu, 28 Feb 2008 22:35:54 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12573496#action_12573496
] 

Raghu Angadi commented on HADOOP-2907:
--------------------------------------

Christian,

What is the read and write pattern like? How fast do clients read? For e.g. on one of the
normal datanodes, there are around 500 connections to DataNode and it is pretty much idle.
These connections need around 200MB active memory. So another DataNode only needs a few times
more connections to run out of memory.



> 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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