[jira] [Created] (MAPREDUCE-4562) Support for "FileSystemCounter" legacy counter group name for compatibility reasons is creating incorrect counter name

["Jarek Jarcec Cecho (JIRA)" <ji...@apache.org>]

Jarek Jarcec Cecho created MAPREDUCE-4562:
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             Summary: Support for "FileSystemCounter" legacy counter group name for compatibility reasons is creating incorrect counter name
                 Key: MAPREDUCE-4562
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4562
             Project: Hadoop Map/Reduce
          Issue Type: Bug
    Affects Versions: 2.0.0-alpha, 0.23.1, 0.23.0
            Reporter: Jarek Jarcec Cecho


Hi Guys,
I was investigating issue in Sqoop project(http://sqoop.apache.org/). Problem is that we are reporting number of written filesystem bytes back to the user and on Hadoop 0.23/2.x we're always getting 0. I've noticed that there was some refactorization in FileSystem counter related code and found MAPREDUCE-3542 requesting backward compatibility.

Included patch seems to be adding counter "FileSystemCounter":

{code:title=hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/counters/AbstractCounters.java:84}
legacyMap.put("FileSystemCounter", FileSystemCounter.class.getName());
{code}

But it appears that original name is "FileSystemCounters" (Notice the plural "s" at the end of name):
{code:title=src/mapred/org/apache/hadoop/mapred/Task.java:91 (0.20.2)}
protected static final String FILESYSTEM_COUNTER_GROUP = "FileSystemCounters";
{code}
{code:title=src/mapred/org/apache/hadoop/mapred/Task.java:109 (1.0.3)}
protected static final String FILESYSTEM_COUNTER_GROUP = "FileSystemCounters";
{code}

I therefore believe that this counter should be renamed in order to provide backward compatibility. I might fix this discrepancy in Sqoop, but I believe that other projects/users might also be affected and therefore it would be better to fix it in upstream.

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