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https://issues.apache.org/jira/browse/AVRO-853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13060895#comment-13060895
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Douglas Kaminsky commented on AVRO-853:
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I agree I forgot about props, they should also invalidate the cached hash
value. You also propose a reasonable optimization.
This is the only method that I have found so far that shows such a dramatic
improvement in performance... for the performance test I've been running
(writing out 100 records), these are my results:
Status Quo (HashMap, no caching): 4600ms
IdentityMap: 2300ms
HashMap with caching: <100ms
> Cache hash codes in Schema and Field
> ------------------------------------
>
> Key: AVRO-853
> URL: https://issues.apache.org/jira/browse/AVRO-853
> Project: Avro
> Issue Type: Improvement
> Components: java
> Affects Versions: 1.5.1
> Reporter: Douglas Kaminsky
> Attachments: AVRO-853.patch
>
>
> We are experiencing a serious performance degradation when trying to
> store/retrieve fields and schemas in hash-based data structures (eg.
> HashMap). Since all fields and schemas are immutable (with the exception of
> RecordSchema allowing deferred setting of Fields) it makes sense to cache the
> hash code on the object instead of recalculating every time the hashCode
> method gets called.
> (Are there other mutable Schema sub-types that I'm not thinking about?)
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