Liang Xie created HDFS-6108:
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             Summary: make the length of the range in sync_file_range() 
configurable
                 Key: HDFS-6108
                 URL: https://issues.apache.org/jira/browse/HDFS-6108
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: datanode
    Affects Versions: 2.3.0, 3.0.0
            Reporter: Liang Xie
            Assignee: Liang Xie


Current codebase has a hard code value for sync_file_range system call, we'd 
better to make it configurable, since different scenario probably has a 
different/better value for it. (ps: i found it's 1 * 1024 * 1024 in fb-20 
branch)



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