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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12008) Improve the available-space block placement policy
Date Thu, 22 Jun 2017 21:27:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12008?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16060031#comment-16060031

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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