[jira] [Resolved] (HDFS-17052) Improve BlockPlacementPolicyRackFaultTolerant to avoid choose nodes failed when no enough Rack.

["Xiaoqiao He (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-17052?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Xiaoqiao He resolved HDFS-17052.
--------------------------------
    Fix Version/s: 3.4.0
     Hadoop Flags: Reviewed
       Resolution: Fixed

Committed to trunk. And mark it is contributed by both [~zhtttylzz] and [~zhangshuyan]. Thanks.

> Improve BlockPlacementPolicyRackFaultTolerant to avoid choose nodes failed when no enough Rack.
> -----------------------------------------------------------------------------------------------
>
>                 Key: HDFS-17052
>                 URL: https://issues.apache.org/jira/browse/HDFS-17052
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namanode
>    Affects Versions: 3.4.0
>            Reporter: Hualong Zhang
>            Assignee: Hualong Zhang
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.4.0
>
>         Attachments: failed reconstruction ec in same rack-1.png, write ec in same rack.png
>
>
> When writing EC data, if the number of racks matching the storageType is insufficient, more than one block are allowed to be written to the same rack
> !write ec in same rack.png|width=962,height=604!
>  
>  
>  
> However, during EC block recovery, it is not possible to recover on the same rack, which deviates from the expected behavior.
> !failed reconstruction ec in same rack-1.png|width=946,height=413!



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