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From "Amit Sela (JIRA)" <j...@apache.org>
Subject [jira] [Created] (BEAM-647) Faul-tolerant sideInputs via Broadcast variables.
Date Tue, 20 Sep 2016 18:53:20 GMT
Amit Sela created BEAM-647:
------------------------------

             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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