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https://issues.apache.org/jira/browse/HADOOP-2120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13108097#comment-13108097
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Uma Maheswara Rao G commented on HADOOP-2120:
---------------------------------------------
Hi Milind,
It looks to me that, Doc is updated in current code base.
{code}
/** Copy all files in a directory to one output file (merge). */
public static boolean copyMerge(FileSystem srcFS, Path srcDir,
FileSystem dstFS, Path dstFile,
boolean deleteSource,
Configuration conf, String addString) throws
IOException {
dstFile = checkDest(srcDir.getName(), dstFS, dstFile, false);
{code}
I am closing it as Not A Problem. If you have any concern with it, please
reopen.
Thanks
Uma
> dfs -getMerge does not do what it says it does
> ----------------------------------------------
>
> Key: HADOOP-2120
> URL: https://issues.apache.org/jira/browse/HADOOP-2120
> Project: Hadoop Common
> Issue Type: Bug
> Components: documentation, fs
> Affects Versions: 0.14.3
> Environment: All
> Reporter: Milind Bhandarkar
> Labels: newbie
>
> 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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