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https://issues.apache.org/jira/browse/KAFKA-3702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17285216#comment-17285216
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Tim Fox commented on KAFKA-3702:
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>> A possible issue (identified by [~david.mao]) is that we don't check if
>>`isOutboundDone` is true in the `close` method.
Yes, I think this is also an issue (perhaps a separate one). According to the
SSLEngine javadoc, wrap() or isOutboundDone() should be called _repeatedly_
until it returns CLOSED/true. Currently we only call it once and assume it will
immediately return with CLOSED/true.
> SslTransportLayer.close() does not shutdown gracefully
> ------------------------------------------------------
>
> Key: KAFKA-3702
> URL: https://issues.apache.org/jira/browse/KAFKA-3702
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 0.10.0.0
> Reporter: Rajini Sivaram
> Assignee: Rajini Sivaram
> Priority: Major
>
> The warning "Failed to send SSL Close message" occurs very frequently when
> SSL connections are closed. Close should write outbound data and shutdown
> gracefully.
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