[jira] [Created] (FLINK-3277) Use Value types in Gelly API

[Shang Yuanchun (Jira)]

Greg Hogan created FLINK-3277:
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             Summary: Use Value types in Gelly API
                 Key: FLINK-3277
                 URL: https://issues.apache.org/jira/browse/FLINK-3277
             Project: Flink
          Issue Type: Improvement
          Components: Gelly
    Affects Versions: 1.0.0
            Reporter: Greg Hogan


This would be a breaking change so the discussion needs to happen before the 1.0.0 release.

I think it would benefit Flink to use {{Value}} types wherever possible. The {{Graph}} functions {{inDegrees}}, {{outDegrees}}, and {{getDegrees}} each return {{DataSet<Tuple2<K, Long>>}}. Using {{Long}} creates a new heap object for every serialization and deserialization. The mutable {{Value}} types do not suffer from this issue when object reuse is enabled.

I lean towards a preference for conciseness in documentation and performance in examples and APIs.



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