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From "Zhijie Shen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5235) mapred.Counters incompatiblity issues with MR1
Date Thu, 16 May 2013 02:09:16 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5235?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13659141#comment-13659141
] 

Zhijie Shen commented on MAPREDUCE-5235:
----------------------------------------

Should you add tests in mapred.TestCounters? mapreduce.TestCounters is for mapreduce.Counters.

{code}
--- hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapreduce/TestCounters.java
+++ hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapreduce/TestCounters.java
{code}

Not sure why functions with the same input need to be called three times. The inner functions
should be deterministic, right?

{code}
for (int i = 0; i < 3; ++i) {
{code}


                
> mapred.Counters incompatiblity issues with MR1
> ----------------------------------------------
>
>                 Key: MAPREDUCE-5235
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5235
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>            Reporter: Zhijie Shen
>            Assignee: Mayank Bansal
>         Attachments: MAPREDUCE-5235-trunk-1.patch
>
>
> MAX_GROUP_LIMIT is removed from Counters in mapred in MR2. Though it seems not to be
the variable that will be referred by the user code. It was actually configurable value MR1.
We should investigate why the upper bound doesn't need to be checked in MR2.

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