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https://issues.apache.org/jira/browse/BEAM-647?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Amit Sela updated BEAM-647:
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Summary: Fault-tolerant sideInputs via Broadcast variables (was:
Faul-tolerant sideInputs via Broadcast variables.t)
> Fault-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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