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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-1459) FileSystem.getFileCacheHints returns IP addresses rather than hostnames, which breaks 'data-locality' in map-reduce
Date Fri, 08 Jun 2007 20:22:26 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-1459?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

dhruba borthakur updated HADOOP-1459:
-------------------------------------

    Status: Patch Available  (was: Open)

The namenode now serializes the hostName as part of DatanodeInfo.  The namenode already had
the hostName readily available.

Another alternative would have been to make a getHostName() call on the DFSClient. But we
did not adopt this approach because a getHostName() call for every replica of every block
could be somewhat time-consuming. 

> FileSystem.getFileCacheHints returns IP addresses rather than hostnames, which breaks
'data-locality' in map-reduce
> -------------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-1459
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1459
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.14.0
>            Reporter: Arun C Murthy
>            Assignee: dhruba borthakur
>            Priority: Blocker
>             Fix For: 0.14.0
>
>         Attachments: getHintsIpAddress.patch
>
>
> FileSystem.getFileCacheHints via DFSClient.getHints (post HADOOP-894?) returns IP address
of the datanodes instead of the hostnames which breaks mapping from task-tracker to datanodes
in map-reduce i.e. the system cannot intelligently place maps on datanodes where blocks are
present.
> I have verified that this affects trunk only, branch-0.13.0 seems ok.

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