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https://issues.apache.org/jira/browse/HDFS-3672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13422708#comment-13422708
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Todd Lipcon commented on HDFS-3672:
-----------------------------------
bq. A small comment on the patch - how about "DiskBlockLocation" instead of
"HdfsBlockLocation" (and similarly for the method name) since other FileSystem
implementations could implement this too.
Given it's an experimental API which we might want to change a few times until
we get it right, I'd rather keep the scope to DistributedFileSystem at this
point, rather than trying to add a generic API. If people come up with a way to
generalize it to other file systems, let's add that as a future enhancement.
Does that sound reasonable?
> 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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