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Steve Loughran commented on HADOOP-11794: ----------------------------------------- I like the direction here. I undertstand while a fail-fast is good: otherwise it's the workers failing and the problem with reporting.That's something to consider later. For now: Caller had better know about the destination. Looking forward to seeing this in, and thanks to everyone engaged in testing it Omkar: if ADL doesn't implement the distcp contract test, you might want to follow up this patch with a distcp test that forces the use of the concat operation. > 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: HADOOP-11794.001.patch, HADOOP-11794.002.patch, > HADOOP-11794.003.patch, HADOOP-11794.004.patch, HADOOP-11794.005.patch, > HADOOP-11794.006.patch, HADOOP-11794.007.patch, HADOOP-11794.008.patch, > HADOOP-11794.009.patch, 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 (v6.3.15#6346) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org