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Posted to common-issues@hadoop.apache.org by "Zhe Zhang (JIRA)" <ji...@apache.org> on 2017/02/16 05:49:41 UTC
[jira] [Commented] (HADOOP-14086) Improve DistCp Speed for small
files
[ https://issues.apache.org/jira/browse/HADOOP-14086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15869273#comment-15869273 ]
Zhe Zhang commented on HADOOP-14086:
------------------------------------
Thanks Zheng. This will be a very useful improvement. Any idea how to reduce NN workload? At the end of the day, if we distcp 1M files we need to call 1M {{getFileInfo}}.. We thought about querying the SbNN but haven't investigated too far.
> Improve DistCp Speed for small files
> ------------------------------------
>
> Key: HADOOP-14086
> URL: https://issues.apache.org/jira/browse/HADOOP-14086
> Project: Hadoop Common
> Issue Type: Improvement
> Components: tools/distcp
> Affects Versions: 2.6.5
> Reporter: Zheng Shao
> Assignee: Zheng Shao
> Priority: Minor
>
> When using distcp to copy lots of small files, NameNode naturally becomes a bottleneck.
> The current distcp code did *not* optimize to reduce the NameNode calls. We should restructure the code to reduce the number of NameNode calls as much as possible to speed up the copy of small files.
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