Daniel Ma created HDFS-16093:
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Summary: DataNodes under decommission will still be returned to
the client via getLocatedBlocks, so the client may request decommissioning
datanodes to read which will cause badly competation on disk IO.
Key: HDFS-16093
URL: https://issues.apache.org/jira/browse/HDFS-16093
Project: Hadoop HDFS
Issue Type: Improvement
Affects Versions: 3.3.1
Reporter: Daniel Ma
DataNodes under decommission will still be returned to the client via
getLocatedBlocks, so the client may request decommissioning datanodes to read
which will cause badly competation on disk IO.
Therefore, datanodes under decommission should be removed from the return list
of getLocatedBlocks api.
!image-2021-06-29-10-50-44-739.png!
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