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https://issues.apache.org/jira/browse/AVRO-2090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16559292#comment-16559292
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ASF GitHub Bot commented on AVRO-2090:
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juwex commented on issue #256: AVRO-2090: Improve encode/decode time for
SpecificRecord using code generation
URL: https://github.com/apache/avro/pull/256#issuecomment-408317797
I'm very excited about the performance improvements with this feature and
would like to see this in a usable state sooner rather than later. If I can
assist getting this branch into a mergeable state, I'd love to do so (with
@rstata 's consent)
There's a rather big issue with schema evolution currently, however. The
generated reader relies on the field order within the `ResolvingDecoder` to
stay the same. Hence, data written with a schema that only differs in regards
to the order of fields will result in an error or (even worse) invalid data. If
required, I can provide a code sample.
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> Improve encode/decode time for SpecificRecord using code generation
> -------------------------------------------------------------------
>
> Key: AVRO-2090
> URL: https://issues.apache.org/jira/browse/AVRO-2090
> Project: Avro
> Issue Type: Improvement
> Components: java
> Reporter: Raymie Stata
> Assignee: Raymie Stata
> Priority: Major
> Attachments: customcoders.md
>
>
> Compared to GenericRecords, SpecificRecords offer type-safety plus the
> performance of traditional getters/setters/instance variables. But these are
> only beneficial to Java code accessing those records. SpecificRecords
> inherit serialization and deserialization code from GenericRecords, which is
> dynamic and thus slow (in fact, benchmarks show that serialization and
> deserialization is _slower_ for SpecificRecord than for GenericRecord).
> This patch extends record.vm to generate custom, higher-performance encoder
> and decoder functions for SpecificRecords. We've run a public benchmark
> showing that the new code reduces serialization time by 2/3 and
> deserialization time by close to 50%.
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