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https://issues.apache.org/jira/browse/HDFS-13310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16419882#comment-16419882
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Daryn Sharp commented on HDFS-13310:
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Is there any way to generalize this feature? Scanning the patch, it looks like
a leaky abstraction. I don't understand why the DN needs all kinds of new
commands (here and other jiras) that are equivalent to "copy or move this
block". If you want to do multi-part upload to s3 magic, that should be hidden
behind the "provided" plugin when a block is copied/moved to it. Not leaked
all throughout hdfs.
> [PROVIDED Phase 2] The DatanodeProtocol should be have DNA_BACKUP to backup
> blocks
> ----------------------------------------------------------------------------------
>
> Key: HDFS-13310
> URL: https://issues.apache.org/jira/browse/HDFS-13310
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Ewan Higgs
> Assignee: Ewan Higgs
> Priority: Major
> Attachments: HDFS-13310-HDFS-12090.001.patch,
> HDFS-13310-HDFS-12090.002.patch
>
>
> As part of HDFS-12090, Datanodes should be able to receive DatanodeCommands
> in the heartbeat response that instructs it to backup a block.
> This should take the form of two sub commands: PUT_FILE (when the file is <=1
> block in size) and MULTIPART_PUT_PART when part of a Multipart Upload (see
> HDFS-13186).
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