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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-972) distcp can timeout during rename operation to s3
Date Mon, 19 Oct 2009 22:42:12 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12767590#action_12767590
] 

Doug Cutting commented on MAPREDUCE-972:
----------------------------------------

> However, for this issue, patching either the old or new API is a non-starter.

+1 We should not change the FileSystem API in this issue.

There appear to be both short and long-term fixes for this issue.  The shortest-term is just
to bump up the timeout for S3 distcp jobs.  The longest is adding FileSystem support for long
renames.

Questions:
  - Will such a short-term fix suffice until the long-term can be addressed (0.22, probably)?
 If so, then there's perhaps no in point considering a more complex interim solution.
  - Should we associate this Jira issue with the short or long-term fix?  If long, then we
might make it depend on a FileSystem API change, to support progress callbacks.


> distcp can timeout during rename operation to s3
> ------------------------------------------------
>
>                 Key: MAPREDUCE-972
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-972
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: distcp
>    Affects Versions: 0.20.1
>            Reporter: Aaron Kimball
>            Assignee: Aaron Kimball
>         Attachments: MAPREDUCE-972.2.patch, MAPREDUCE-972.3.patch, MAPREDUCE-972.4.patch,
MAPREDUCE-972.5.patch, MAPREDUCE-972.patch
>
>
> rename() in S3 is implemented as copy + delete. The S3 copy operation can perform very
slowly, which may cause task timeout.

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