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https://issues.apache.org/jira/browse/MAPREDUCE-7177?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Akira Ajisaka updated MAPREDUCE-7177:
-------------------------------------
Resolution: Fixed
Hadoop Flags: Reviewed
Fix Version/s: 2.9.3
3.2.1
3.3.0
3.1.2
2.10.0
Status: Resolved (was: Patch Available)
Committed this to trunk, branch-3.2, branch-3.1, branch-2, and branch-2.9.
Thanks [~kihwal] for the report and [~uranus] for providing the patch!
> Disable speculative execution in TestDFSIO
> ------------------------------------------
>
> Key: MAPREDUCE-7177
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7177
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 3.2.0, 2.8.5
> Reporter: Kihwal Lee
> Assignee: Zhaohui Xin
> Priority: Major
> Fix For: 2.10.0, 3.1.2, 3.3.0, 3.2.1, 2.9.3
>
> Attachments: MAPREDUCE-7177.001.patch
>
>
> When TestDFSIO runs in a certain environment where a subset of mappers are
> slow, the speculative execution can start. In the write phase, this will
> make existing mapper to fail in next addBlock() since the output files are
> overwritten.
> To make the benchmark more predictable and repeatable, speculation must be
> implicitly disabled in TestDFSIO itself.
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