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From "Christian Kunz (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-2158) hdfsListDirectory in libhdfs does not scale
Date Tue, 06 Nov 2007 06:58:50 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-2158?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Christian Kunz updated HADOOP-2158:
-----------------------------------

    Attachment: 2158.patch

> 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
>            Priority: Blocker
>         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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