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https://issues.apache.org/jira/browse/HADOOP-3841?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12650845#action_12650845
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Christian Kunz commented on HADOOP-3841:
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This seems to be fixed in hadoop-0.18. Could not reproduce.
> merge phase runs out of disk space
> ----------------------------------
>
> Key: HADOOP-3841
> URL: https://issues.apache.org/jira/browse/HADOOP-3841
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.17.2
> Reporter: Christian Kunz
>
> We observe that reduce tasks run out of disk space during merging (after
> fetching all map output) although there would be enough space if the
> framework did not try to generate too large merge files.
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