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https://issues.apache.org/jira/browse/HDFS-9808?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ewan Higgs resolved HDFS-9808.
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Resolution: Won't Fix
This was part of HDFS-11190.
> 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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