[jira] [Created] (AVRO-2999) Optimize Ruby union serialization

["Joel Turkel (Jira)" <ji...@apache.org>]

Joel Turkel created AVRO-2999:
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             Summary: Optimize Ruby union serialization
                 Key: AVRO-2999
                 URL: https://issues.apache.org/jira/browse/AVRO-2999
             Project: Apache Avro
          Issue Type: Improvement
          Components: ruby
    Affects Versions: 1.10.0
            Reporter: Joel Turkel
            Assignee: Joel Turkel


Profiling Avro serialization in our union heavy schema shows some memory and throughput bottlenecks:
 * Validation calls repeatedly allocate constant hashes
 * Validation calls repeatedly allocate constant strings
 * Validation calls are expensive and can be avoided when determining of a datum matches a null union member type (a common pattern for "optional" fields)

Optimizing these codepaths reduces memory allocations by 78% and improves throughput 1.9X in our encoding benchmarks. A Github PR is coming shortly.

Note: Encoding unions is still expensive because the code must determine which member of the union a datum is targeting. Allowing clients to explicitly specify this would speed up serialization even further but that requires a larger API change.



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