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From "cpeel@kence.org (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2635) NNBench creates duplicate files if multiple maps are run from the same client
Date Tue, 06 Dec 2011 20:11:40 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2635?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

cpeel@kence.org updated HDFS-2635:
----------------------------------

    Status: Open  (was: Patch Available)
    
> NNBench creates duplicate files if multiple maps are run from the same client
> -----------------------------------------------------------------------------
>
>                 Key: HDFS-2635
>                 URL: https://issues.apache.org/jira/browse/HDFS-2635
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: test
>    Affects Versions: 0.20.205.0, 0.20.204.0, 0.20.203.0
>            Reporter: cpeel@kence.org
>            Priority: Minor
>
> NNBench creates files in the format:
>   file_<hostname>__<filenum>
> This works seamlessly as long as all of the Hadoop clients in the cluster are each running
with a single map slot. If multiple map slots are available on a single client, each mapper
tries to create the same set of files. This can result in lock contention on some non-Hadoop
HDFS implementations thereby defeating the purpose of the NNBench test.
> Making the files unique per mapper, not per host, resolves this.

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