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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2158) hdfsListDirectory in libhdfs does not scale
Date Sat, 08 Dec 2007 01:36:43 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12549633

Hadoop QA commented on HADOOP-2158:

+1 overall.  Here are the results of testing the latest attachment 
against trunk revision r602270.

    @author +1.  The patch does not contain any @author tags.

    javadoc +1.  The javadoc tool did not generate any warning messages.

    javac +1.  The applied patch does not generate any new compiler warnings.

    findbugs +1.  The patch does not introduce any new Findbugs warnings.

    core tests +1.  The patch passed core unit tests.

    contrib tests +1.  The patch passed contrib unit tests.

Test results: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1300/testReport/
Findbugs warnings: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1300/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1300/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1300/console

This message is automatically generated.

> 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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