checkpoint seems to be just add a CheckPoint mark? You need an action after
marked it. I have tried it with success:)
newRdd = oldRdd.map(myFun).persist(myStorageLevel)
newRdd.checkpoint // <<checkpoint here
newRdd.isCheckpointed // false here
newRdd.foreach(x => {}) // Force evaluation
newRdd.isCheckpointed // true here
oldRdd.unpersist(true)
~~~~~~~~
If you have new broadcast object for each step of iteration, broadcast will
eat up all of the memory. You may need to set "spark.cleaner.ttl" to a small
enough value.
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