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Posted to mapreduce-dev@hadoop.apache.org by "dhruba borthakur (JIRA)" <ji...@apache.org> on 2011/01/11 19:31:47 UTC

[jira] Created: (MAPREDUCE-2257) distcp can copy blocks in parallel

distcp can copy blocks in parallel
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                 Key: MAPREDUCE-2257
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2257
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: distcp
            Reporter: dhruba borthakur
            Assignee: dhruba borthakur


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)

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