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https://issues.apache.org/jira/browse/HDFS-16093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17372116#comment-17372116
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Xiaoqiao He commented on HDFS-16093:
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-1 to remove DECOMMISSIONING state node from `LocatedBlocks` directly.
A. It is possible that all replicas of one block on DECOMMISSIONING node, and
client will meet BlockMissing Exception if we do that but actually not as
[~sodonnell] mentioned above.
B. We would sort DECOMMISSIONING or DECOMMISSIONED to the end of
`LocatedBlocks` but not remove directly.
> 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
> Priority: Critical
>
> 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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