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HDFS >> mail # user >> DFSOutputStream.sync() method latency time

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DFSOutputStream.sync() method latency time
When client  write data, if there are three replicates,  the sync method
latency time formula should be:
sync method  latency time = first datanode receive data time + sencond
datanode receive data  time +  third datanode receive data time.

if the three datanode receive data time all are 2 millisecond, so the sync
method  latency time should is 6 millisecond,  but according to our our
monitor, the the sync method  latency time is 2 millisecond.
How to calculate sync method  latency time?