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https://issues.apache.org/jira/browse/HDFS-12946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16605367#comment-16605367
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Ayush Saxena commented on HDFS-12946:
-------------------------------------
Thanx [~xiaochen] for working on this.The new feature looks good and would be
very helpful.
Just one thing can we somehow link it with the enable command also so that
when a policy is enabled we can get to know its status with the present network
topology. :)
> Add a tool to check rack configuration against EC policies
> ----------------------------------------------------------
>
> Key: HDFS-12946
> URL: https://issues.apache.org/jira/browse/HDFS-12946
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: erasure-coding
> Reporter: Xiao Chen
> Assignee: Xiao Chen
> Priority: Major
> Attachments: HDFS-12946.01.patch
>
>
> From testing we have seen setups with problematic racks / datanodes that
> would not suffice basic EC usages. These are usually found out only after the
> tests failed.
> We should provide a way to check this beforehand.
> Some scenarios:
> - not enough datanodes compared to EC policy's highest data+parity number
> - not enough racks to satisfy BPPRackFaultTolerant
> - highly uneven racks to satisfy BPPRackFaultTolerant
> - highly uneven racks (so that BPP's considerLoad logic may exclude some busy
> nodes on the rack, resulting in #2)
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