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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3672) Expose disk-location information for blocks to enable better scheduling
Date Mon, 16 Jul 2012 21:06:34 GMT
Andrew Wang created HDFS-3672:
---------------------------------

             Summary: 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


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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