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https://issues.apache.org/jira/browse/HDFS-3672?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Wang updated HDFS-3672:
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Attachment: hdfs-3672-5.patch
Another patch rev, basically just doing stylistic cleanups. I haven't heard any
code-related feedback in a while, so I haven't changed any classnames or added
any conf options.
I've tried to satisfy all the comments thus far, and I would really like to get
this in soon if possible. Happy to listen to any further feedback about what I
can do to make this happen.
> 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, hdfs-3672-1.patch, hdfs-3672-2.patch,
> hdfs-3672-3.patch, hdfs-3672-4.patch, hdfs-3672-5.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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