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tomscut commented on HDFS-16093: -------------------------------- IMO, abnormal nodes cannot be removed directly. Maybe sorting is a better choice, because it makes it easier to degrade read when there are not enough normal nodes. Just like the example [~sodonnell] gave. > 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! -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org