Andrew Wang created HDFS-3672:
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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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