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https://issues.apache.org/jira/browse/KAFKA-6168?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16252532#comment-16252532
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Loïc Monney commented on KAFKA-6168:
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Hello [~rhauch],
First, thank you very much for creating this issue and helping us :)
I created this morning an issue in the schema-registry
(https://github.com/confluentinc/schema-registry/issues/665) that illustrates
the problems you mentioned above with the maps and the significant usages of
`hashCode` and `equals`.
> Connect Schema comparison is slow for large schemas
> ---------------------------------------------------
>
> Key: KAFKA-6168
> URL: https://issues.apache.org/jira/browse/KAFKA-6168
> Project: Kafka
> Issue Type: Improvement
> Components: KafkaConnect
> Affects Versions: 1.0.0
> Reporter: Randall Hauch
> Assignee: Ted Yu
> Priority: Critical
> Attachments: 6168.v1.txt
>
>
> The {{ConnectSchema}} implementation computes the hash code every time its
> needed, and {{equals(Object)}} is a deep equality check. This extra work can
> be expensive for large schemas, especially in code like the {{AvroConverter}}
> (or rather {{AvroData}} in the converter) that uses instances as keys in a
> hash map that then requires significant use of {{hashCode}} and {{equals}}.
> The {{ConnectSchema}} is an immutable object and should at a minimum
> precompute the hash code. Also, the order that the fields are compared in
> {{equals(...)}} should use the cheapest comparisons first (e.g., the {{name}}
> field is one of the _last_ fields to be checked). Finally, it might be worth
> considering having each instance precompute and cache a string or byte[]
> representation of all fields that can be used for faster equality checking.
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