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https://issues.apache.org/jira/browse/HDFS-12725?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Chen updated HDFS-12725:
-----------------------------
       Resolution: Fixed
     Hadoop Flags: Reviewed
    Fix Version/s: 3.0.0
           Status: Resolved  (was: Patch Available)

Committed to trunk and branch-3.0. Thanks for the reviews Wei-Chiu and Eddy!

> BlockPlacementPolicyRackFaultTolerant fails with very uneven racks
> ------------------------------------------------------------------
>
>                 Key: HDFS-12725
>                 URL: https://issues.apache.org/jira/browse/HDFS-12725
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: erasure-coding
>    Affects Versions: 3.0.0
>            Reporter: Xiao Chen
>            Assignee: Xiao Chen
>            Priority: Major
>              Labels: hdfs-ec-3.0-must-do
>             Fix For: 3.0.0
>
>         Attachments: HDFS-12725.01.patch, HDFS-12725.02.patch, 
> HDFS-12725.03.patch, HDFS-12725.04.patch, HDFS-12725.05.patch, 
> HDFS-12725.06.patch
>
>
> HDFS-12567 tries to fix the scenario where EC blocks may not be allocated in 
> extremely rack-imbalanced cluster.
> The added fall-back step of the fix could be improved to do a best-effort 
> placement. This is more likely to happen in testing than in real clusters.



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