holdenk created BEAM-3290:
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Summary: Construct iterators directly if possible to allow
spilling to disk
Key: BEAM-3290
URL: https://issues.apache.org/jira/browse/BEAM-3290
Project: Beam
Issue Type: Improvement
Components: runner-spark
Reporter: holdenk
Assignee: Amit Sela
When you construct a collection first and convert it to an iterator you force
Spark to evaluate the entire input partition before it can get the first
element off the output. This breaks some of the spilling to disk Spark can do
otherwise. Instead chain operations on Iterators.
This is only possible in the Java API for Spark 2 and above (and that's my
fault from back in my work in the Spark project).
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