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https://issues.apache.org/jira/browse/KAFKA-7721?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mickael Maison resolved KAFKA-7721.
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Resolution: Cannot Reproduce
We are now removing ZooKeeper support so closing this issue.
> Connection to zookeeper refused
> -------------------------------
>
> Key: KAFKA-7721
> URL: https://issues.apache.org/jira/browse/KAFKA-7721
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 2.1.0
> Environment: Dockerized containers - kubernetes 1.9
> Reporter: Mohammad Etemad
> Priority: Major
>
> Kafka throws exception when trying to connect to zookeeper. This happens when
> zookeeper connection is lost and recovered. Kafka seems to be stuck in a loop
> that cannot renew the connection. Here are the logs:
> 2018-12-11 13:52:52,905] INFO Opening socket connection to server
> zookeeper-0.zookeeper.logging.svc.cluster.local/10.38.128.12:2181. Will not
> attempt to authenticate using SASL (unknown error)
> (org.apache.zookeeper.ClientCnxn)
> [2018-12-11 13:52:52,906] WARN Session 0x1001443ad77000f for server null,
> unexpected error, closing socket connection and attempting reconnect
> (org.apache.zookeeper.ClientCnxn)
> java.net.ConnectException: Connection refused
> at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
> at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
> at
> org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
> at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1141)
> On the zookeeper side it can be seen that kafka connection is established.
> Here are the logs:
> 2018-12-11 13:53:44,969 [myid:] - INFO
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxnFactory@215] -
> Accepted socket connection from /10.38.128.8:46066
> 2018-12-11 13:53:44,976 [myid:] - INFO
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:ZooKeeperServer@938] - Client
> attempting to establish new session at /10.38.128.8:46066
> 2018-12-11 13:53:45,005 [myid:] - INFO [SyncThread:0:ZooKeeperServer@683] -
> Established session 0x10060ff12a58dc0 with negotiated timeout 30000 for
> client /10.38.128.8:46066
> 2018-12-11 13:53:45,071 [myid:] - INFO [ProcessThread(sid:0
> cport:2181)::PrepRequestProcessor@487] - Processed session termination for
> sessionid: 0x10060ff12a58dc0
> 2018-12-11 13:53:45,077 [myid:] - INFO
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@1040] - Closed
> socket connection for client /10.38.128.8:46066 which had sessionid
> 0x10060ff12a58dc0
> 2018-12-11 13:53:47,119 [myid:] - INFO
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxnFactory@215] -
> Accepted socket connection from /10.36.0.8:48798
> 2018-12-11 13:53:47,124 [myid:] - INFO
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:ZooKeeperServer@938] - Client
> attempting to establish new session at /10.36.0.8:48798
> 2018-12-11 13:53:47,134 [myid:] - INFO [SyncThread:0:ZooKeeperServer@683] -
> Established session 0x10060ff12a58dc1 with negotiated timeout 30000 for
> client /10.36.0.8:48798
> 2018-12-11 13:53:47,582 [myid:] - INFO [ProcessThread(sid:0
> cport:2181)::PrepRequestProcessor@487] - Processed session termination for
> sessionid: 0x10060ff12a58dc1
> 2018-12-11 13:53:47,592 [myid:] - INFO
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@1040] - Closed
> socket connection for client /10.36.0.8:48798 which had sessionid
> 0x10060ff12a58dc1
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