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https://issues.apache.org/jira/browse/HDFS-12008?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16060031#comment-16060031
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Kihwal Lee commented on HDFS-12008:
-----------------------------------
Hmm. Trunk is doing what's expected. 1) choose a random node. So the two nodes
can come from any rack. 2) choose one from remote rack. The two nodes can again
be picked from any rack. 3) Pick a node that is in the rack from 2). I see two
nodes being picked from the same rack that the node picked in 2) belongs to.
So the behavior of trunk is correct. I will look at branch-2.8 more.
> Improve the available-space block placement policy
> --------------------------------------------------
>
> Key: HDFS-12008
> URL: https://issues.apache.org/jira/browse/HDFS-12008
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: block placement
> Affects Versions: 2.8.1
> Reporter: Kihwal Lee
> Assignee: Kihwal Lee
> Attachments: HDFS-12008.patch
>
>
> AvailableSpaceBlockPlacementPolicy currently picks two nodes unconditionally,
> then picks one node. It could avoid picking the second node when not
> necessary.
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