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https://issues.apache.org/jira/browse/MAPREDUCE-6174?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14567812#comment-14567812
 ] 

Gera Shegalov commented on MAPREDUCE-6174:
------------------------------------------

Hi [~eepayne], thanks for 006. Agreed regarding checkstyle. 

I am sorry, I have one remaining tiny nit before committing. The second 
deprecated constructor should also delegate for clarity:
{code}
  @Deprecated
  @VisibleForTesting
  OnDiskMapOutput(TaskAttemptID mapId, TaskAttemptID reduceId,
                         MergeManagerImpl<K,V> merger, long size,
                         JobConf conf,
                         MapOutputFile mapOutputFile,
                         int fetcher, boolean primaryMapOutput,
                         FileSystem fs, Path outputPath) throws IOException {
    this(mapId, merger, size, conf, fetcher, primaryMapOutput, fs, outputPath);
  }
{code}

> Combine common stream code into parent class for InMemoryMapOutput and 
> OnDiskMapOutput.
> ---------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-6174
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6174
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mrv2
>    Affects Versions: 3.0.0, 2.6.0
>            Reporter: Eric Payne
>            Assignee: Eric Payne
>              Labels: BB2015-05-RFC
>         Attachments: MAPREDUCE-6174.002.patch, MAPREDUCE-6174.003.patch, 
> MAPREDUCE-6174.004.patch, MAPREDUCE-6174.005.patch, MAPREDUCE-6174.006.patch, 
> MAPREDUCE-6174.v1.txt
>
>
> Per MAPREDUCE-6166, both InMemoryMapOutput and OnDiskMapOutput will be doing 
> similar things with regards to IFile streams.
> In order to make it explicit that InMemoryMapOutput and OnDiskMapOutput are 
> different from 3rd-party implementations, this JIRA will make them subclass a 
> common class (see 
> https://issues.apache.org/jira/browse/MAPREDUCE-6166?focusedCommentId=14223368&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14223368)



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