Yi Liu created HDFS-9032:
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             Summary: Small improvement for DatanodeManager#sortLocatedBlocks
                 Key: HDFS-9032
                 URL: https://issues.apache.org/jira/browse/HDFS-9032
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Yi Liu
            Assignee: Yi Liu
            Priority: Minor


This is a minor improvement:
In sortLocatedBlocks, (in most cases) if locations of located block don't 
contain decommissioned/stale datanode, no need to call Arrays.sort.
Also we can make the comparator as the class variable.



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