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https://issues.apache.org/jira/browse/HADOOP-2907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12573023#action_12573023
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rangadi edited comment on HADOOP-2907 at 2/27/08 11:09 AM:
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Koji and I looked at one of the datanodes. Attached jmap-histo.txt is the
output of 'jmap -histo'. The top entry takes pretty much all the memory :
{noformat}
num #instances #bytes class name
--------------------------------------
1: 25039 918792056 [B
2: 38666 4910272 [C
3: 23620 2674272 <constMethodKlass>
4: 23620 1893912 <methodKlass>
5: 38347 1549664 <symbolKlass>
{noformat}
Does "[B" refer to byte arrays? Any ideas about how get anymore info out of
this process are welcome.
EDIT : Please ignore this one, I guess we need to run 'jmap -histo:live", which
shows much more sober picture.
was (Author: rangadi):
Koji and I looked at one of the datanodes. Attached jmap-histo.txt is the
output of 'jmap -histo'. The top entry takes pretty much all the memory :
{noformat}
num #instances #bytes class name
--------------------------------------
1: 25039 918792056 [B
2: 38666 4910272 [C
3: 23620 2674272 <constMethodKlass>
4: 23620 1893912 <methodKlass>
5: 38347 1549664 <symbolKlass>
{noformat}
Does "[B" refer to byte arrays? Any ideas about how get anymore info out of
this process are welcome.
> 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 "[EMAIL PROTECTED]" java.lang.OutOfMemoryError: Java heap
> space
> Exception in thread "DataNode: [dfs.data.dir-value]"
> java.lang.OutOfMemoryError: Java heap space
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