Is Dataframe write blocking?

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Is Dataframe write blocking?

ramannanda9@gmail.com
HI,

I have some futures setup to operate in stages, where I expect one stage to complete before another begins. I was hoping that dataframe write call is blocking, whereas the behavior i see is that the call returns before data is persisted. This can cause unintended consequences. I am also using fair scheduler so that independent jobs can run in parallel. 

Spark 2.3.1.

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Regards,
Ramandeep Singh
http://orastack.com