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https://issues.apache.org/jira/browse/HDFS-12946?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kitti Nanasi updated HDFS-12946:
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    Attachment: HDFS-12946.07.patch

> 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: Kitti Nanasi
>            Priority: Major
>         Attachments: HDFS-12946.01.patch, HDFS-12946.02.patch, 
> HDFS-12946.03.patch, HDFS-12946.04.fsck.patch, HDFS-12946.05.patch, 
> HDFS-12946.06.patch, HDFS-12946.07.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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