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From Song Liu <song...@outlook.com>
Subject How to know the DAG is starting to run
Date Fri, 11 May 2018 07:57:50 GMT
Hi,

I have something just want to be done only once when DAG is constructed, but it seems that
DAG will be instanced every time when run each of operator.

So is that there function in DAG that tell us it is starting to run now ?

Thanks,
Song
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