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https://issues.apache.org/jira/browse/HADOOP-3841?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12617360#action_12617360
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Devaraj Das commented on HADOOP-3841:
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If compression is on, the merge output would be compressed. The situation is
better in 0.18 with compression working well.
At this point of time, the only other option is to have a smaller
io.sort.factor but this, in general, might increase the disk IO for the map
output records, affecting performance in a negative way.
> 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: 0.17.1
> 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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