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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3672) Expose disk-location information for blocks to enable better scheduling
Date Sat, 21 Jul 2012 21:31:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419953#comment-13419953
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Arun C Murthy commented on HDFS-3672:
-------------------------------------

Todd - the possibilities are intriguing. However, it still seems we have a lot of work ahead
of us to realize the potential.

So, before we jump in and add new public apis, can you/Andrew provide a study or better, an
prototype, which *proves* that this api would be actually useful in some way downstream?

Maybe we can look at some performance numbers if you have them? Or, maybe we can work on a
branch where we have a clearly defined goal (say: improve HBase or improve MR scheduling)
and we achieve that before we commit to this? 
                
> Expose disk-location information for blocks to enable better scheduling
> -----------------------------------------------------------------------
>
>                 Key: HDFS-3672
>                 URL: https://issues.apache.org/jira/browse/HDFS-3672
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 2.0.0-alpha
>            Reporter: Andrew Wang
>            Assignee: Andrew Wang
>         Attachments: hdfs-3672-1.patch
>
>
> Currently, HDFS exposes on which datanodes a block resides, which allows clients to make
scheduling decisions for locality and load balancing. Extending this to also expose on which
disk on a datanode a block resides would enable even better scheduling, on a per-disk rather
than coarse per-datanode basis.
> This API would likely look similar to Filesystem#getFileBlockLocations, but also involve
a series of RPCs to the responsible datanodes to determine disk ids.

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