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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3672) Expose disk-location information for blocks to enable better scheduling
Date Wed, 15 Aug 2012 18:47:38 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13435399#comment-13435399
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Aaron T. Myers commented on HDFS-3672:
--------------------------------------

bq. @Aaron, want to make sure we are on the same page. This is a temporary solution. I am
not going to block committing this change. When we make enough progress in HDFS-2832, I plan
to remove this functionality.

To be clear, you mean that you're going to implement this differently, right? The thing that
I care about is that clients that wish to have access to this information can get to it. I
agree that once HDFS-2832 is implemented, this information will be available in the NN, so
we won't need to do the RPC fanout to the DNs, but the user API will remain.
                
> 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: design-doc-v1.pdf, design-doc-v2.pdf, hdfs-3672-1.patch, hdfs-3672-2.patch,
hdfs-3672-3.patch, hdfs-3672-4.patch, hdfs-3672-5.patch, hdfs-3672-6.patch, hdfs-3672-7.patch,
hdfs-3672-8.patch, hdfs-3672-9.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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