Ruinan Gu created HDFS-16566:
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Summary: Erasure Coding: Recovery may causes excess replicas when
busy DN exsits
Key: HDFS-16566
URL: https://issues.apache.org/jira/browse/HDFS-16566
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 3.3.2
Reporter: Ruinan Gu
Simple case: RS3-2 ,[0(busy),2,3,4] (1 missing), liveblockIndice=[2,3,4],
additionalRepl=1.So the DN will get the LiveBitSet=[2,3,4] and targets.length=1.
According to StripedWriter.initTargetIndices(), 0 will get recovered instead of
1. So the internal blocks will become [0(busy),2,3,4,0'(excess)].Although NN
will detect, delete the excess replicas and recover the missing block(1)
correctly after the wrong recovery of 0', I don't think this process is
expected and the recovery of 0' is obviously wrong and not necessary.
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