Brandon Li created HDFS-6416:
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             Summary: Use Time#monotonicNow in OpenFileCtx and OpenFileCtxCatch 
to avoid system clock bugs
                 Key: HDFS-6416
                 URL: https://issues.apache.org/jira/browse/HDFS-6416
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: nfs
            Reporter: Brandon Li
            Priority: Minor


As [~cnauroth]  pointed out in HADOOP-10612,  Time#monotonicNow is a more 
preferred method to use since this isn't subject to system clock bugs (i.e. 
Someone resets the clock to a time in the past, and then updates don't happen 
for a long time.)




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