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https://issues.apache.org/jira/browse/KAFKA-4171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15491532#comment-15491532
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Ewen Cheslack-Postava commented on KAFKA-4171:
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Yeah, that's almost definitely what's happening [~criccomini]. I'm not sure 
that actually stripping them out will solve this problem though because the 
consumer.* prefixed version will probably also be printed by the worker config. 
We can try to remove the settings in each case, although this is also just a 
more general problem with the way Kafka handles configs (e.g. a sensitive 
serializer setting, e.g. something like SSL settings for a schema registry, 
can't possibly be known by the framework and so would always be logged). So I 
think we can fix this immediate issue, but the way configs are logged might 
still be an issue.

> Kafka-connect prints outs keystone and truststore password in log2
> ------------------------------------------------------------------
>
>                 Key: KAFKA-4171
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4171
>             Project: Kafka
>          Issue Type: Improvement
>          Components: KafkaConnect
>    Affects Versions: 0.10.0.0
>            Reporter: Akshath Patkar
>            Assignee: Ewen Cheslack-Postava
>
> Kafka-connect prints outs keystone and truststore password in log
> [2016-09-14 16:30:33,971] WARN The configuration 
> consumer.ssl.truststore.password = XXXXX was supplied but isn't a known 
> config. (org.apache.kafka.clients.consumer.ConsumerConfig:186)



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