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Posted to dev@kafka.apache.org by "Ewen Cheslack-Postava (JIRA)" <ji...@apache.org> on 2017/11/21 22:27:00 UTC
[jira] [Resolved] (KAFKA-6168) Connect Schema comparison is slow
for large schemas
[ https://issues.apache.org/jira/browse/KAFKA-6168?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ewen Cheslack-Postava resolved KAFKA-6168.
------------------------------------------
Resolution: Fixed
Fix Version/s: 1.1.0
Issue resolved by pull request 4176
[https://github.com/apache/kafka/pull/4176]
> 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
> Fix For: 1.1.0
>
> 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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