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Posted to mapreduce-issues@hadoop.apache.org by "Zhaohui Xin (JIRA)" <ji...@apache.org> on 2019/02/02 04:29:00 UTC
[jira] [Assigned] (MAPREDUCE-7177) Disable speculative execution in
TestDFSIO
[ https://issues.apache.org/jira/browse/MAPREDUCE-7177?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Zhaohui Xin reassigned MAPREDUCE-7177:
--------------------------------------
Assignee: Zhaohui Xin
> 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
>
> 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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