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https://issues.apache.org/jira/browse/HADOOP-2158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12547224
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dhruba borthakur commented on HADOOP-2158:
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Good patch. Code looks good. + 1.
II think the listPaths API on a directory used to return the size of the entire
directory subtree. However, the listStatus API on a directory does not do so.
If your application is not replying the original behaviour of listPaths then
this change makes sense.
> hdfsListDirectory in libhdfs does not scale
> -------------------------------------------
>
> Key: HADOOP-2158
> URL: https://issues.apache.org/jira/browse/HADOOP-2158
> Project: Hadoop
> Issue Type: Bug
> Components: libhdfs
> Affects Versions: 0.15.0
> Reporter: Christian Kunz
> Assignee: Christian Kunz
> Priority: Blocker
> Fix For: 0.15.2
>
> Attachments: 2158.patch
>
>
> hdfsListDirectory makes one rpc call using deprecated
> fs.FileSystem.listPaths, and then two rpc calls for every entry in the
> returned array. When running a job with more than 3000 mappers each running a
> pipes application using libhdfs to scan a dfs directory with about 100-200
> entries, this results in about 1M rpc calls to the namenode server
> overwhelming it.
> hdfsListDirectory should call fs.FileSystem.listStatus instead.
> I will submit a patch.
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