[jira] Updated: (HADOOP-2120) dfs -getMerge does not do what it says it does

["Arun C Murthy (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-2120?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Arun C Murthy updated HADOOP-2120:
----------------------------------

    Component/s:     (was: mapred)
                 fs

> dfs -getMerge does not do what it says it does
> ----------------------------------------------
>
>                 Key: HADOOP-2120
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2120
>             Project: Hadoop
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 0.14.3
>         Environment: All
>            Reporter: Milind Bhandarkar
>             Fix For: 0.16.0
>
>
> dfs -getMerge, which calls FileUtil.CopyMerge, contains this javadoc:
> {code}
> Get all the files in the directories that match the source file pattern
>    * and merge and sort them to only one file on local fs 
>    * srcf is kept.
> {code}
> However, it only concatenates the set of input files, rather than merging them in sorted order.
> Ideally, the copyMerge should be equivalent to a map-reduce job with IdentityMapper and IdentityReducer with numReducers = 1. However, not having to run this as a map-reduce job has some advantages, since it increases cluster utilization during reduce phase.

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