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https://issues.apache.org/jira/browse/HADOOP-14086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15869273#comment-15869273
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Zhe Zhang commented on HADOOP-14086:
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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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