question What does it mean, Spark persist call on its own does not force evaluation.? in Archives of Support Questions (Read Only)

What does it mean, Spark persist call on its own does not force evaluation.?

Srini_D — Fri, 16 Sep 2022 09:36:48 GMT

I was recollecing few information about spark in documentation and crossed the below point

" Spark persist call on its own does not force evaluation.?"

Re: What does it mean, Spark persist call on its own does not force evaluation.?

srowen — Wed, 05 Aug 2015 18:05:06 GMT

If you call persist() on an RDD, it means that the data in the RDD will be persisted but only later when something causes it to be computed for the first time. It is not immediately evaluated.