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From "Christian Kunz (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3841) merge phase runs out of disk space
Date Mon, 28 Jul 2008 06:47:31 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3841?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12617371#action_12617371
] 

Christian Kunz commented on HADOOP-3841:
----------------------------------------

Although compression will help (I will try to turn on compression with 0.18), would it make
sense in general to make the merge algorithm adapt to available disk space and merge in smaller
steps if necessary instead of just failing?

> 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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