Amit Sela created BEAM-703:
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Summary: SingletonViewFn might exhaust defaultValue if it's
serialized after used.
Key: BEAM-703
URL: https://issues.apache.org/jira/browse/BEAM-703
Project: Beam
Issue Type: Bug
Components: sdk-java-core
Reporter: Amit Sela
Assignee: Amit Sela
Priority: Minor
In
https://github.com/apache/incubator-beam/blob/master/sdks/java/core/src/main/java/org/apache/beam/sdk/util/PCollectionViews.java#L267
the defaultValue is set to null to avoid decoding over and over I assume.
If the defaultValue is accessed before the the SingletonViewFn is serialized,
it will exhaust the encoded value (assigned with null) while losing the
transient decoded value.
It'd probably be best to simply check if defaultValue is null before decoding,
so that decode will still happen just once, but the encoded data is not lost.
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