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Hadoop QA commented on MAPREDUCE-2257: -------------------------------------- -1 overall. Here are the results of testing the latest attachment http://issues.apache.org/jira/secure/attachment/12476634/MAPREDUCE-2257.patch against trunk revision 1094093. +1 @author. The patch does not contain any @author tags. +1 tests included. The patch appears to include 4 new or modified tests. +1 javadoc. The javadoc tool did not generate any warning messages. -1 javac. The applied patch generated 2256 javac compiler warnings (more than the trunk's current 2244 warnings). +1 findbugs. The patch does not introduce any new Findbugs (version 1.3.9) warnings. +1 release audit. The applied patch does not increase the total number of release audit warnings. +1 core tests. The patch passed core unit tests. -1 contrib tests. The patch failed contrib unit tests. +1 system test framework. The patch passed system test framework compile. Test results: https://hudson.apache.org/hudson/job/PreCommit-MAPREDUCE-Build/173//testReport/ Findbugs warnings: https://hudson.apache.org/hudson/job/PreCommit-MAPREDUCE-Build/173//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html Console output: https://hudson.apache.org/hudson/job/PreCommit-MAPREDUCE-Build/173//console This message is automatically generated. > distcp can copy blocks in parallel > ---------------------------------- > > Key: MAPREDUCE-2257 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-2257 > Project: Hadoop Map/Reduce > Issue Type: Improvement > Components: distcp > Affects Versions: 0.21.0 > Reporter: dhruba borthakur > Assignee: dhruba borthakur > Attachments: MAPREDUCE-2257.patch > > > The minimum unit of work for a distcp task is a file. We have files that are > greater than 1 TB with a block size of 1 GB. If we use distcp to copy these > files, the tasks either take a long long long time or finally fails. A better > way for distcp would be to copy all the source blocks in parallel, and then > stich the blocks back to files at the destination via the HDFS Concat API > (HDFS-222) -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira