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https://issues.apache.org/jira/browse/KAFKA-3702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17285218#comment-17285218
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Ismael Juma commented on KAFKA-3702:
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Also `isOutboundDone` says:
{quote}Returns whether wrap(ByteBuffer, ByteBuffer) will produce any more
outbound data messages.
Note that during the closure phase, a SSLEngine may generate handshake closure
data that must be sent to the peer. wrap() must be called to generate this
data. When this method returns true, no more outbound data will be created.
{quote}
> 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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