Amit Sela created BEAM-647:
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Summary: Faul-tolerant sideInputs via Broadcast variables.
Key: BEAM-647
URL: https://issues.apache.org/jira/browse/BEAM-647
Project: Beam
Issue Type: Bug
Components: runner-spark
Reporter: Amit Sela
Assignee: Amit Sela
Following https://github.com/apache/incubator-beam/pull/909 which enables
checkpointing to recover from failures, sideInputs (being implemented by
broadcast variables) should be handled in a specific manner as described here:
http://spark.apache.org/docs/1.6.2/streaming-programming-guide.html#accumulators-and-broadcast-variables.
This is a bit more complicated than Aggregators (via Accumulators) as they are
implemented using a single "aggregating" Accumulator, while a pipeline may
contain multiple sideInputs.
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