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From "Daniel Halperin (JIRA)" <>
Subject [jira] [Updated] (BEAM-847) Make DelegatingAggregator creation nonblocking
Date Fri, 28 Oct 2016 17:06:58 GMT


Daniel Halperin updated BEAM-847:
    Issue Type: Improvement  (was: Bug)

> Make DelegatingAggregator creation nonblocking
> ----------------------------------------------
>                 Key: BEAM-847
>                 URL:
>             Project: Beam
>          Issue Type: Improvement
>          Components: runner-core, runner-dataflow, runner-direct, runner-flink, sdk-java-core
>            Reporter: Thomas Groh
>            Assignee: Thomas Groh
> This normally would not be a problem, as users are expected to create Aggregators in
a non-performance-sensitive fashion. {{GroupAlsoByWindowViaWindowSet}} also creates an {{Aggregator}},
and this is a runner-provided {{DoFn}} (and may be created some arbitrary number of times
on workers); this call should not use a shared resource.
> As the IDs of an {{Aggregator}} are used only to ensure that an {{Aggregator}} has a
consistent identity across a serialization boundary, used in the {{AggregatorPipelineExtractor}},
these can be less random so long as they remain mostly unique.

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