HDFS updates the modification time of a file when the file is created.
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                 Key: HDFS-504
                 URL: https://issues.apache.org/jira/browse/HDFS-504
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: name-node
    Affects Versions: 0.20.1
            Reporter: Chun Zhang
            Priority: Minor
             Fix For: 0.20.1


HDFS updates the modification time of a file when the file is created. We would 
like to update the modification time of the file when the file is closed after 
being written to. This helps HDFS Raid to detect file changes more aggressively.

Solution includes:
1. Made changes to 
closeFile@/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java;
2. Added unit test to 
testTimesAtClose@/org/apache/hadoop/hdfs/TestSetTimes.java.

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