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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2158) hdfsListDirectory in libhdfs does not scale
Date Tue, 06 Nov 2007 07:55:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12540369
] 

Devaraj Das commented on HADOOP-2158:
-------------------------------------

Just realized that in HADOOP-2076, the tasks were getting killed because they could not connect
to the tasktracker. So this issue may not be the cause of that one.

> 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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