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From "Christian Kunz (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-2158) hdfsListDirectory in libhdfs does not scale
Date Tue, 06 Nov 2007 06:28:51 GMT
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

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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