Chris Douglas created HDFS-9808:
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Summary: Combine READ_ONLY_SHARED DatanodeStorages with the same ID
Key: HDFS-9808
URL: https://issues.apache.org/jira/browse/HDFS-9808
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Chris Douglas
In HDFS-5318, each datanode that can reach a (read only) block reports itself
as a valid location for the block. While accurate, this increases (redundant)
block report traffic and- without partitioning on the backend- may return an
overwhelming number of replica locations for each block.
Instead, a DN could report only that the shared storage is reachable. The
contents of the storage could be reported separately/synthetically to the block
manager, which can collapse all instances into a single storage. A subset of
locations- closest to the client, etc.- can be returned, rather than all
possible locations.
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