Chen Liang created HDFS-11514:
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Summary: ChooseRandom can potentially be optimized
Key: HDFS-11514
URL: https://issues.apache.org/jira/browse/HDFS-11514
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Chen Liang
Assignee: Chen Liang
Based on the offline discussion, one potential improvement to the
{{chooseRandomWithStorageType}} added in HDFS-11482 is that, currently given a
node, the method iterates all its children to sum up the number of candidate
datanodes. Since datanode status change is much less frequent than block
placement request. It is more efficient to get rid of this iteration check, by
probably maintaining another disk type counter map. This JIRA tracks (but not
limited) this optimization.
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