[jira] [Resolved] (HDFS-3619) isGoodBlockCandidate() in Balancer is not handling properly if replica factor >3

["Tsz Wo Nicholas Sze (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-3619?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsz Wo Nicholas Sze resolved HDFS-3619.
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    Resolution: Not A Problem

Resolving as not-a-problem.  Please feel free to reopen if you disagree.


> isGoodBlockCandidate() in Balancer is not handling properly if replica factor >3
> --------------------------------------------------------------------------------
>
>                 Key: HDFS-3619
>                 URL: https://issues.apache.org/jira/browse/HDFS-3619
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: balancer & mover
>    Affects Versions: 1.0.0, 2.0.0-alpha
>            Reporter: Junping Du
>            Assignee: Junping Du
>
> Let's assume:
> 1. replica factor = 4
> 2. source node in rack 1 has 1st replica, 2nd and 3rd replica are in rack 2, 4th replica in rack3 and target node is in rack3. 
> So, It should be good for balancer to move replica from source node to target node but will return "false" in isGoodBlockCandidate(). I think we can fix it by simply making judgement that at least one replica node (other than source) is on the different rack of target node.



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