Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/15921#discussion_r88731845
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
@@ -485,7 +485,10 @@ class Dataset[T] private[sql](
def isStreaming: Boolean = logicalPlan.isStreaming
/**
- * Returns a checkpointed version of this Dataset.
+ * Eagerly checkpoint a Dataset and return the new Dataset.
Checkpointing can be used to truncate
+ * the logical plan of this Dataset, which is especially useful in
iterative algorithms where the
+ * plan may grow exponentially. It will be saved to a file inside the
checkpoint
--- End diff --
nit: `a file` -> `files`.
Each partition will be saved to one file.
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