[jira] [Created] (HDFS-16093) 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.

["Daniel Ma (Jira)" <ji...@apache.org>]

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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