[jira] [Created] (HADOOP-12975) Add jitter to DU's thread

[Elliott Clark (JIRA)]

Elliott Clark created HADOOP-12975:
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             Summary: Add jitter to DU's thread
                 Key: HADOOP-12975
                 URL: https://issues.apache.org/jira/browse/HADOOP-12975
             Project: Hadoop Common
          Issue Type: Sub-task
            Reporter: Elliott Clark
            Assignee: Elliott Clark


Running DU across lots of disks is very expensive and running all of the 
processes at the same time creates a noticeable IO spike. We should add some 
jitter.



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