Github user ffbin commented on the pull request:
https://github.com/apache/flink/pull/973#issuecomment-127449876
hi, System.currentTimeMillis() is cost performance very much.I want to use
a thread to call System.currentTimeMillis and update a static long variable
millTime.All other module do not need call System.currentTimeMillis() and can
use millTime directly.I have test it can improve performance very much.
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