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https://issues.apache.org/jira/browse/KAFKA-6208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16358637#comment-16358637
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Randall Hauch commented on KAFKA-6208:
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[~Satyajit], it might be possible to start scanning asynchronously, but then
whenever code needs a plugin it would have to block. Doable, but that's logged
under KAFKA-5451 (now linked).
> Reduce startup time for Kafka Connect workers
> ---------------------------------------------
>
> Key: KAFKA-6208
> URL: https://issues.apache.org/jira/browse/KAFKA-6208
> Project: Kafka
> Issue Type: Improvement
> Components: KafkaConnect
> Affects Versions: 1.0.0
> Reporter: Randall Hauch
> Priority: Major
>
> Kafka Connect startup times are excessive with a handful of connectors on the
> plugin path or classpath. We should not be scanning three times (once for
> connectors, once for SMTs, and once for converters), and hopefully we can
> avoid scanning directories that are clearly not plugin directories.
> We should also consider using Java's Service Loader to quickly identify
> connectors. The latter would require a KIP and would require time to for
> connectors to migrate, but we could be smarter about only scanning plugin
> directories that need to be scanned.
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