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https://issues.apache.org/jira/browse/HDFS-14061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16735969#comment-16735969
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Kitti Nanasi commented on HDFS-14061:
-------------------------------------

Thanks for the comment [~ayushtkn]!

You are right, failing the policy setting might be too harsh. Why I wanted to 
do that was because when setting the policy and writing to the folder, the 
error message we get is quite misleading. But I think if that message is 
corrected, it will be fine, so I raised 
[HDFS-14187|https://issues.apache.org/jira/browse/HDFS-14187] for that.

And in patch 002 I fixed your comments.

> Check if the cluster topology supports the EC policy before setting, enabling 
> or adding it
> ------------------------------------------------------------------------------------------
>
>                 Key: HDFS-14061
>                 URL: https://issues.apache.org/jira/browse/HDFS-14061
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: erasure-coding, hdfs
>    Affects Versions: 3.1.1
>            Reporter: Kitti Nanasi
>            Assignee: Kitti Nanasi
>            Priority: Major
>         Attachments: HDFS-14061.001.patch, HDFS-14061.002.patch
>
>
> HDFS-12946 introduces a command for verifying if there are enough racks and 
> datanodes for the enabled erasure coding policies.
> This verification could be executed for the erasure coding policy before 
> enabling, setting or adding it and a warning message could be written if the 
> verify fails, or the policy setting could be even failed in this case.



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