Aviem Zur created BEAM-1146:
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Summary: Spark runner ~1m startup overhead
Key: BEAM-1146
URL: https://issues.apache.org/jira/browse/BEAM-1146
Project: Beam
Issue Type: Improvement
Reporter: Aviem Zur
BEAM-921 introduced a lazy singleton instantiated once in each machine (driver
& executors) which utilizes reflection to find all subclasses of Source and
Coder
While this is beneficial in it's own right, the change added about one minute
of overhead in spark runner startup time (which cause the first job/stage to
take up to a minute).
The change is in class {{BeamSparkRunnerRegistrator}}
The reason reflection (specifically reflections library) was used here is
because there is no current way of knowing all the source and coder classes at
runtime.
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