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https://issues.apache.org/jira/browse/HDFS-5207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13768203#comment-13768203
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Junping Du commented on HDFS-5207:
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Thanks for great comments, Nicholas! I addressed them in v3 patch. Please help
to take a look at it again. Thx!
> In BlockPlacementPolicy, update 2 parameters of chooseTarget()
> --------------------------------------------------------------
>
> Key: HDFS-5207
> URL: https://issues.apache.org/jira/browse/HDFS-5207
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: Junping Du
> Assignee: Junping Du
> Attachments: HDFS-5207-v1.patch, HDFS-5207-v2.patch,
> HDFS-5207-v3.patch
>
>
> We should change chooseTarget(..., DatanodeDescriptor writer, ...) to
> chooseTarget (..., node writer, ...) as the only important property of writer
> is to identify other nodes' location relationship so more generic one could
> be better. It also helps to cover cases that client node is not a Datanode.
> Also, the excluded nodes are not necessary to be a HashMap with the same key
> and value, Set is more proper in this case.
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