Github user liancheng commented on the issue:
https://github.com/apache/spark/pull/15517
I'm closing this since caching is not the ultimate solution for this
problem anyway. Caching is too memory consuming when you, say, computing
connected components in an iterative way over a graph with 50 billion nodes.
Going to add a checkpoint API for Dataset so that we can truncate both the
plan tree and the RDD lineage without caching.
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