Ming Ma created HDFS-9577:
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             Summary: ReadStatistics not thread safe when hedged read is enabled
                 Key: HDFS-9577
                 URL: https://issues.apache.org/jira/browse/HDFS-9577
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Ming Ma


When hedged read is enabled, the actual read will be called on the hedged 
thread pool which will also call {{updateReadStatistics}}. However, it seems 
{{ReadStatistics}} doesn't use atomic types for its metrics. [~xieliang007], 
can you please confirm?



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