[jira] [Commented] (HDFS-12725) BlockPlacementPolicyRackFaultTolerant still fails with racks with very few nodes

["Xiao Chen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-12725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16221649#comment-16221649 ] 

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

For anyone interested in debugging, you could temporarily just LOG.debug inside {{logNodeIsNotChosen}}. Otherwise the message is not shown - see HDFS-12726 for details.

> 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
>         Attachments: HDFS-12725.01.patch, HDFS-12725.02.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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