[jira] [Commented] (MAPREDUCE-5055) Binary compatibility for the method Reporter.incrCounter(String group, String counter, long amount) between hadoop-1.x and hadoop-2.x

["Zhijie Shen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13597651#comment-13597651 ] 

Zhijie Shen commented on MAPREDUCE-5055:
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@Deepesh, would you please make sure hadoop-mapreduce-examples-2.x.jar is not in the mapreduce lib directory? If it is, "hadoop jar build/hadoop-examples-1.2.0-SNAPSHOT.jar" will not run RandomWriter in hadoop-examples-1.2.0-SNAPSHOT.jar, but run RandomWriter in hadoop-mapreduce-examples-2.x.jar. I guess this might be reason why you didn't see the expected exception when running the hadoop-1 example on hadoop-2.
                
> Binary compatibility for the method Reporter.incrCounter(String group, String counter, long amount) between hadoop-1.x and hadoop-2.x
> -------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-5055
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5055
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 2.0.3-alpha
>         Environment: Linux
>            Reporter: Deepesh Khandelwal
>         Attachments: RandomWriter.java
>
>
> Try to generate a lot of counters that exceed the default max limit so the job errors.
> To simulate this edit org.apache.hadoop.examples.RandomWriter class and add the following in the mapper:
> {code}
>         for (int i = 0; i < 150; i++) {
>           reporter.incrCounter("StringCounter", "counter" + i, 1L);
>         }
> {code}
> Attached is the modified code of RandomWriter.java from branch-1.
> When I run it against branch-1,
> {code}
> hadoop jar build/hadoop-examples-1.2.0-SNAPSHOT.jar -Dtest.randomwrite.total_bytes=8 rw2
> {code}
> it fails with the following error:
> {code}
> java.lang.Exception: org.apache.hadoop.mapred.Counters$CountersExceededException: Error: Exceeded limits on number of counters - Counters=120 Limit=120
> {code}
> Using the jar compiled with branch-1 when running in a hadoop 2 cluster completes without any error and don't see the counter. Interestingly there were two more custom counters in the same job that are incremented and they are visible. The difference is that they use the method 
> Reporter.incrCounter(Enum<?> key, long amount).
> Compiled this against 2.x/trunk and ran it. The job did fail with the expected counter exceeded exception. So it seems to be a case of binary incompatibility between 1.x and 2.x.

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