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Posted to commits@beam.apache.org by "Kenneth Knowles (JIRA)" <ji...@apache.org> on 2017/11/20 16:23:00 UTC
[jira] [Created] (BEAM-3227) Consider sharing Udf/SkdFunctionSpec
records via pointer
Kenneth Knowles created BEAM-3227:
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Summary: Consider sharing Udf/SkdFunctionSpec records via pointer
Key: BEAM-3227
URL: https://issues.apache.org/jira/browse/BEAM-3227
Project: Beam
Issue Type: Sub-task
Components: beam-model
Reporter: Kenneth Knowles
Coders are stored by pointer, because they are often repeated and a common source of huge pipeline descriptions.
We considered doing the same for all UDFs but decided not to, based on the logic that they are not as often identical and will rarely implement the equals() needed to actually share encoded versions.
However, in the presence of generated code, it is very likely that DoFns and CombineFns are repeated, and also much more likely that they have meaningful equals(), so there could be size savings.
None of this is terribly important for storage or transmission, but has more to do with arbitrary and small size limits that occur in some API frameworks or database column types.
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