You are viewing a plain text version of this content. The canonical link for it is here.
Posted to common-issues@hadoop.apache.org by "Huafeng Wang (JIRA)" <ji...@apache.org> on 2017/09/13 06:21:01 UTC
[jira] [Commented] (HADOOP-11794) Enable distcp to copy blocks in
parallel
[ https://issues.apache.org/jira/browse/HADOOP-11794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16164197#comment-16164197 ]
Huafeng Wang commented on HADOOP-11794:
---------------------------------------
Hi guys, I noticed that the patch for branch2 targets to version 2.9.x and we have the same requirement for version 2.8.x. I tried to backport the patch to branch-2.8.2 and found most of the code is compatible. I filed a new [issue|https://issues.apache.org/jira/browse/HADOOP-14866] and the patch is available. Please take a look if you are interested.
> Enable distcp to 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
> Fix For: 2.9.0, 3.0.0-alpha4
>
> 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, HADOOP-11794.010.branch2.002.patch, HADOOP-11794.010.branch2.patch, HADOOP-11794.010.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
(v6.4.14#64029)
---------------------------------------------------------------------
To unsubscribe, e-mail: common-issues-unsubscribe@hadoop.apache.org
For additional commands, e-mail: common-issues-help@hadoop.apache.org