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https://issues.apache.org/jira/browse/MAPREDUCE-7132?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Peter Bacsko updated MAPREDUCE-7132:
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Summary: JobSplitWriter prints unnecessary warnings if EC is used (was:
Check erasure coding in JobSplitWriter to avoid warnings)
> JobSplitWriter prints unnecessary warnings if EC is used
> --------------------------------------------------------
>
> Key: MAPREDUCE-7132
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7132
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: client, mrv2
> Affects Versions: 3.1.1
> Reporter: Peter Bacsko
> Assignee: Peter Bacsko
> Priority: Major
> Attachments: MAPREDUCE-7132-001.patch, MAPREDUCE-7132-002.patch,
> MAPREDUCE-7132-003.patch, MAPREDUCE-7132-004.patch, MAPREDUCE-7132-005.patch,
> MAPREDUCE-7132-006.patch, MAPREDUCE-7132-007.patch
>
>
> Currently, {{JobSplitWriter}} compares the number of hosts for a certain
> block against a static value that comes from
> {{mapreduce.job.max.split.locations}}. The default value of this property is
> 10.
> However, an EC shema like RS-10-4 requires at least 14 hosts. In this case,
> 14 block locations will be returned and {{JobSplitWriter}} prints a warning,
> which can confuse users.
> A possible solution could check whether EC is enabled for a block and
> increase this value dynamically if needed. A simpler one is to simply
> increase the default value to a sensible number like 15.
>
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