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https://issues.apache.org/jira/browse/HDFS-4606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13603995#comment-13603995
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Sanjay Radia commented on HDFS-4606:
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A long running service such as HBASE region server sometimes relocates; in such
a situation it is desirable to relocate replicas for the file blocks such a
server reads to the server's location. (See the discussion in HBASE-4755). The
alternate idea of co-locating blocks of HBase's "store files" would provide
lower latency after failover compared to this proposal; however this proposal
is also useful in general, easy to implement and would, I suspect, solve a good
part of the region server performance-after-failover issue.
> HDFS API to move file replicas to caller's location
> ---------------------------------------------------
>
> Key: HDFS-4606
> URL: https://issues.apache.org/jira/browse/HDFS-4606
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Sanjay Radia
> Assignee: Sanjay Radia
>
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