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Date: Fri, 24 Feb 2017 04:59:45 +0000 (UTC)
From: "Yongjun Zhang (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Message-ID: <JIRA.12495281.1294770616000.51868.1487912385335@Atlassian.JIRA>
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Subject: [jira] [Commented] (HADOOP-11794) distcp can copy blocks in
 parallel
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archived-at: Fri, 24 Feb 2017 04:59:53 -0000


    [ https://issues.apache.org/jira/browse/HADOOP-11794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15881955#comment-15881955 ] 

Yongjun Zhang commented on HADOOP-11794:
----------------------------------------

Looks like something changed in the build side, same patch rev7 was almost clean in last run (except for checkstyle, and a few unrelated test failure), but it different errors above.

Uploaded new rev8 which has a fix for totalBytesToCopy.
 

> 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, 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)


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