Gwen Shapira created KAFKA-2738:
-----------------------------------

             Summary: Can't set SSL as inter-broker-protocol by rolling restart 
of brokers
                 Key: KAFKA-2738
                 URL: https://issues.apache.org/jira/browse/KAFKA-2738
             Project: Kafka
          Issue Type: Bug
            Reporter: Gwen Shapira


Scenario (as carefully documented by [~benstopford]:

1. Start 2 or more brokers with listeners on both PLAINTEXT and SSL protocols, 
and PLAINTEXT as security.inter.broker.protocol:

inter.broker.protocol.version = 0.9.0.X
security.inter.broker.protocol = PLAINTEXT
listeners = PLAINTEXT://:9092,SSL://:9093

2. Stop one of the brokers and change security.inter.broker.protocol to SSL

inter.broker.protocol.version = 0.9.0.X
security.inter.broker.protocol = SSL
listeners = PLAINTEXT://:9092,SSL://:9093

3. Start that broker again.

You will get replication errors as it will attempt to use SSL on a PLAINTEXT 
port:

<code>
WARN ReplicaFetcherThread-0-3, Error in fetch 
kafka.server.ReplicaFetcherThread$FetchRequest@78ca3ba1. Possible cause: 
java.io.IOException: Connection to Node(3, worker4, 9092) failed 
(kafka.server.ReplicaFetcherThread)
WARN Failed to send SSL Close message 
(org.apache.kafka.common.network.SslTransportLayer)
java.io.IOException: Broken pipe
at sun.nio.ch.FileDispatcherImpl.write0(Native Method)
at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:47)
at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:93)
at sun.nio.ch.IOUtil.write(IOUtil.java:65)
at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:492)
at 
org.apache.kafka.common.network.SslTransportLayer.flush(SslTransportLayer.java:188)
at 
org.apache.kafka.common.network.SslTransportLayer.close(SslTransportLayer.java:161)
at org.apache.kafka.common.network.KafkaChannel.close(KafkaChannel.java:50)
at org.apache.kafka.common.network.Selector.close(Selector.java:448)
at org.apache.kafka.common.network.Selector.poll(Selector.java:316)
at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:270)
at 
kafka.utils.NetworkClientBlockingOps$.recurse$1(NetworkClientBlockingOps.scala:128)
at 
kafka.utils.NetworkClientBlockingOps$.kafka$utils$NetworkClientBlockingOps$$pollUntilFound$extension(NetworkClientBlockingOps.scala:139)
at 
kafka.utils.NetworkClientBlockingOps$.kafka$utils$NetworkClientBlockingOps$$pollUntil$extension(NetworkClientBlockingOps.scala:105)
at 
kafka.utils.NetworkClientBlockingOps$.blockingReady$extension(NetworkClientBlockingOps.scala:58)
at kafka.server.ReplicaFetcherThread.sendRequest(ReplicaFetcherThread.scala:202)
at kafka.server.ReplicaFetcherThread.fetch(ReplicaFetcherThread.scala:192)
at kafka.server.ReplicaFetcherThread.fetch(ReplicaFetcherThread.scala:42)
at 
kafka.server.AbstractFetcherThread.processFetchRequest(AbstractFetcherThread.scala:102)
at kafka.server.AbstractFetcherThread.doWork(AbstractFetcherThread.scala:93)
at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:63)
</code>



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