[ https://issues.apache.org/jira/browse/HADOOP-2120?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Uma Maheswara Rao G resolved HADOOP-2120. ----------------------------------------- Resolution: Not A Problem > 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. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira