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https://issues.apache.org/jira/browse/MAPREDUCE-7072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16425564#comment-16425564
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Wilfred Spiegelenburg commented on MAPREDUCE-7072:
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The root cause of the issue is located in the {{AbstractCounters}} code
{{getGroupNames()}}
When you track through the code in the debugger the number of counter groups
returned is higher than expected. This is due to the fact that we add the
deprecated counters names to the list of counter group names before we return.
The display name of the counters that are tracked in the deprecated list,
stored in the legacyMap, are the same as the display names in the
non-deprecated counters. The deprecated counters added are already in the non
deprecated list which causes the duplication.
It works in the JSON format because it internally uses a HashMap. The HashMap
uses the name of the counter groups as the key. The keys clash and we thus
overwrite the existing value with the value from the deprecated value.
To track where this issue is coming from: MAPREDUCE-4053 changed the iteration
to work for oozie and seems related to OOZIE-777 and the HadoopELFunctions
which still seems to use the deprecated counter name.
Changing what the method returns is thus not possible without breaking oozie.
We can use the iterator that can be returned by the abstract counters as it
does not include the deprecated names.
> mapred job -history prints duplicate counter in human output
> ------------------------------------------------------------
>
> Key: MAPREDUCE-7072
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7072
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: client
> Affects Versions: 3.0.0
> Reporter: Wilfred Spiegelenburg
> Assignee: Wilfred Spiegelenburg
> Priority: Major
>
> 'mapred job -history' command prints duplicate entries for counters only for
> the human output format. It does not do this for the JSON format.
> mapred job -history /user/history/somefile.jhist -format human
> {code}
> ....
> |Job Counters |Total megabyte-seconds taken by all map tasks|0 |0 |268,288,000
> ...
> |Job Counters |Total megabyte-seconds taken by all map tasks|0 |0 |268,288,000
> ....
> {code}
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