[jira] [Created] (BEAM-703) SingletonViewFn might exhaust defaultValue if it's serialized after used.

["Amit Sela (JIRA)" <ji...@apache.org>]

Amit Sela created BEAM-703:
------------------------------

             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. 



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)