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https://issues.apache.org/jira/browse/HDFS-3672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423413#comment-13423413
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Andrew Purtell commented on HDFS-3672:
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This can also be viewed as the query side of an API for device aware block
placement. Consider renaming things like {{DiskBlockLocation}} to
{{BlockDeviceLocation}} for such consideration. One attribute of
{{BlockDeviceLocation}} should be {{enum Type}}. Then follow up work could be
adding an API for specifying block placement according to
{{BlockDeviceLocation.Type}}.
This would enable use cases like creating certain files on
{{BlockDeviceLocation.Type.FLASH}} where they might be frequently accessed,
especially for random reads; and others (and by default) on
{{BlockDeviceLocation.Type.DISK}} for selecting spinning media.
Please pardon the interruption.
> 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, hdfs-3672-2.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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