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From "Xiao Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12725) BlockPlacementPolicyRackFaultTolerant still fails with racks with very few nodes
Date Fri, 03 Nov 2017 04:52:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16237089#comment-16237089
] 

Xiao Chen commented on HDFS-12725:
----------------------------------

Ran the 3 failed tests locally, all passed. Checkstyle same as [above|https://issues.apache.org/jira/browse/HDFS-12725?focusedCommentId=16233673&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16233673].

Committing this based on Eddy's +1

> BlockPlacementPolicyRackFaultTolerant still fails with racks with very few nodes
> --------------------------------------------------------------------------------
>
>                 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
>         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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