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From "Deepesh Khandelwal (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-5055) Binary compatibility for the method Reporter.incrCounter(String group, String counter, long amount) between hadoop-1.x and hadoop-2.x
Date Sat, 09 Mar 2013 00:09:13 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5055?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Deepesh Khandelwal resolved MAPREDUCE-5055.
-------------------------------------------

    Resolution: Not A Problem

Thanks Zhijie. It turns out that examples jar is included in the classpath when hadoop jar
command is run. I renamed my Class to something else and then I got the expected result i.e.
the job failed with Counter limit exceeded error.
                
> 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
>            Assignee: Zhijie Shen
>         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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