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Mithun Radhakrishnan updated HADOOP-11794: ------------------------------------------ Assignee: Yongjun Zhang (was: Mithun Radhakrishnan) > distcp can copy blocks in parallel > ---------------------------------- > > Key: HADOOP-11794 > URL: https://issues.apache.org/jira/browse/HADOOP-11794 > Project: Hadoop Common > Issue Type: Improvement > Components: tools/distcp > Affects Versions: 0.21.0 > Reporter: dhruba borthakur > Assignee: Yongjun Zhang > 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 was sent by Atlassian JIRA (v6.3.4#6332)