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https://issues.apache.org/jira/browse/HDFS-4606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13604017#comment-13604017
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Aaron T. Myers commented on HDFS-4606:
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I recommend reading through the full discussion on HDFS-2004 even if this
proposal is slightly different.
On HDFS-2004, I proposed not necessarily pinning, but just politely requesting,
that block replicas be moved to a particular DN. At the time, Allen vetoed even
that proposal as well. There's also some discussion of potential implementation
difficulties, particularly in the context of ensuring that the NN does not
remove the "wrong" block replica when a block becomes over-replicated because a
client requested a replica be put on a specific DN.
I'd also be curious to understand the precise semantics you're going for in
this JIRA, e.g. do you want this replica placement hint to be persistent?
Perhaps you could update the JIRA description with some details of the proposal?
Thanks a lot, Sanjay.
> 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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