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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