daimin created HDFS-16430:
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Summary: Validate maximum blocks in EC group when adding an EC
policy
Key: HDFS-16430
URL: https://issues.apache.org/jira/browse/HDFS-16430
Project: Hadoop HDFS
Issue Type: Improvement
Components: ec, erasure-coding
Affects Versions: 3.3.1, 3.3.0
Reporter: daimin
Assignee: daimin
HDFS EC adopts the last 4 bits of block ID to store the block index in EC block
group. Therefore maximum blocks in EC block group is 2^4=16, and which is
defined here: HdfsServerConstants#MAX_BLOCKS_IN_GROUP.
Currently there is no limitation or warning when adding a bad EC policy with
numDataUnits + numParityUnits > 16. It only results in read/write error on EC
file with bad EC policy. To users this is not very straightforward.
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