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Posted to mapreduce-issues@hadoop.apache.org by "Xiao Chen (JIRA)" <ji...@apache.org> on 2018/10/16 17:24:00 UTC
[jira] [Updated] (MAPREDUCE-7132) JobSplitWriter prints unnecessary
warnings if EC(RS10,4) is used
[ https://issues.apache.org/jira/browse/MAPREDUCE-7132?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Xiao Chen updated MAPREDUCE-7132:
---------------------------------
Summary: JobSplitWriter prints unnecessary warnings if EC(RS10,4) is used (was: JobSplitWriter prints unnecessary warnings if EC is used)
> JobSplitWriter prints unnecessary warnings if EC(RS10,4) 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, MAPREDUCE-7132-008.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 schema 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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