Xiao Chen created HDFS-12946:
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Summary: 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
>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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