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https://issues.apache.org/jira/browse/MAPREDUCE-5937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15221332#comment-15221332
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Akira AJISAKA commented on MAPREDUCE-5937:
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bq. fgroups.containsKey(newGroup) and groups.containsKey(newGroup)) should be
!fgroups.containsKey(newGroup) and !groups.containsKey(newGroup)), respectively
Sorry, my bad. This changes breaks TestCounters#testLegacyGetGroupsNames.
> hadoop/mapred job -history <history_file> shows the counters twice in the
> output.
> ---------------------------------------------------------------------------------
>
> Key: MAPREDUCE-5937
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5937
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 2.2.0, 2.7.2
> Reporter: Jinghui Wang
> Assignee: Andres Perez
> Labels: BB2015-05-TBR
> Attachments: MAPREDUCE-5937-branch-2.7-02.patch,
> MAPREDUCE-5937-branch-2.7.2.002.patch, MAPREDUCE-5937.patch,
> job_history_cli_sample.out
>
>
> HiistoryView#printCounters method uses AbstractCounter#getGroupNames, which
> includes legacy groups can cause duplicates on CLI output.
> See attached example output.
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