Steven Aerts created AVRO-3527:
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Summary: Generated equals() and hashCode() for SpecificRecords
Key: AVRO-3527
URL: https://issues.apache.org/jira/browse/AVRO-3527
Project: Apache Avro
Issue Type: Improvement
Components: java
Reporter: Steven Aerts
Attachments: equals_hashcode_after.txt, equals_hashcode_before.txt,
flame_graph.jpeg
When profiling our production system, we found that it was spending almost 40%
of its overall time in the {{SpecificRecordBase.hashCode()}} and
{{SpecificRecordBase.equals()}} implementations.
In some sections of its logic we see that almost all time is spend in those
function, as can be seen in attached flame graph (blue "pyramids")
!flame_graph.jpeg|width=385,height=99!
By generating the {{.equals()}} and {{.hashCode()}} all this overhead
disappeared and this application became 35% faster overall.
Also on other AVRO heavy applications we saw noticeable performance gains where
we hadn't expect them due to this improvement.
A generated implementation of {{.hashCode()}} becomes 5 to 10 times faster than
its generic counterpart. For {{.equals()}} it is 10 to 20 times faster.
Which is also visible in the attached JMH benchmarks.
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