SammiChen created HDFS-12394:
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             Summary: Erasure coding policy cell size should not be greater 
than file block size
                 Key: HDFS-12394
                 URL: https://issues.apache.org/jira/browse/HDFS-12394
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: erasure-coding
    Affects Versions: 3.0.0-alpha4
            Reporter: SammiChen


Current the minimum block size is defined by 
"dfs.namenode.fs-limits.min-block-size" with default value 1MB.  Default block 
size is defined by "dfs.blocksize" with default value 128MB. Maximum erasure 
coding policy cell size is defined by "dfs.namenode.ec.policies.max.cellsize" 
with default value 4MB.  We need to make sure the erasure coding policy cell 
size should not. be greater than file block size, file read/write will fail. 





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