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No data issued by flink window after a few hours

Hi all,

    I used flink window, and when the job begins, we could get the results of windiow.But there’re no results issued after a few hours.

    I found the job is still running and no errors, and the data not used window all can be issued.

    By the way, I used Flink 1.3.2 and ram to cache the distinct data about sliding window.