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From Michael Han <h...@apache.org>
Subject Re: Is 3.5.5 client compatible with 3.4.x servers
Date Thu, 18 Jul 2019 03:25:58 GMT
In theory, they should be compatible. See backward compatibility section
https://cwiki.apache.org/confluence/display/ZOOKEEPER/ReleaseManagement

(where Major is 3, Minor is 5 and Minor - 1 is 4, in this case).

In practice, this one looks incompatible. The Op code 15 in 3.5.5 client
was added in https://issues.apache.org/jira/browse/ZOOKEEPER-1297 which was
only committed to 3.5, not 3.4...

On Wed, Jul 17, 2019 at 11:33 AM Göktürk Gezer <gokturk@alluxio.com> wrote:

> Gentle Ping!
> I noticed I forgot to mention that we are using java api for zk client. In
> case it makes a difference.
>
> Thanks,
> Gokturk
>
> > On Jul 12, 2019, at 4:33 PM, Göktürk Gezer <gokturk@alluxio.com> wrote:
> >
> > Hi Everyone,
> > I recently bumped zookeeper client version to 3.5.5 in order to make use
> of new constructor with ZKClientConfig. (Via curator 4.2.0)
> > This apparently broke communicating with older ZK server at version
> 3.4.9. Is this expected?
> >
> > Client traces:
> > ClientCnxn - Opening socket connection to server ReplicationFt-masters-1/
> 172.31.20.201:2181. Will not attempt to authenticate using SASL (unknown
> error)
> > 2019-07-12 23:20:30,875 INFO  ClientCnxn - Socket connection
> established, initiating session, client: /172.31.20.201:50028, server:
> ReplicationFt-masters-1/172.31.20.201:2181
> > 2019-07-12 23:20:30,876 INFO  ClientCnxn - Session establishment
> complete on server ReplicationFt-masters-1/172.31.20.201:2181, sessionid
> = 0x16be87b7d400004, negotiated timeout = 40000
> > 2019-07-12 23:20:30,876 INFO  ConnectionStateManager - State change:
> RECONNECTED
> > 2019-07-12 23:20:30,877 INFO  ClientCnxn - Unable to read additional
> data from server sessionid 0x16be87b7d400004, likely server has closed
> socket, closing socket connection and attempting reconnect
> > 2019-07-12 23:20:30,978 INFO  ConnectionStateManager - State change:
> SUSPENDED
> > 2019-07-12 23:20:32,724 INFO  ClientCnxn - Opening socket connection to
> server ReplicationFt-masters-1/172.31.20.201:2181. Will not attempt to
> authenticate using SASL (unknown error)
> > 2019-07-12 23:20:32,724 INFO  ClientCnxn - Socket connection
> established, initiating session, client: /172.31.20.201:50030, server:
> ReplicationFt-masters-1/172.31.20.201:2181
> > 2019-07-12 23:20:32,725 INFO  ClientCnxn - Session establishment
> complete on server ReplicationFt-masters-1/172.31.20.201:2181, sessionid
> = 0x16be87b7d400004, negotiated timeout = 40000
> > 2019-07-12 23:20:32,725 INFO  ConnectionStateManager - State change:
> RECONNECTED
> > 2019-07-12 23:20:32,726 INFO  AbstractPrimarySelector - Primary selector
> transitioning to SECONDARY
> > 2019-07-12 23:20:32,727 INFO  ClientCnxn - Unable to read additional
> data from server sessionid 0x16be87b7d400004, likely server has closed
> socket, closing socket connection and attempting reconnect
> > 2019-07-12 23:20:32,827 INFO  ConnectionStateManager - State change:
> SUSPENDED
> > 2019-07-12 23:20:34,412 INFO  ClientCnxn - Opening socket connection to
> server ReplicationFt-masters-1/172.31.20.201:2181. Will not attempt to
> authenticate using SASL (unknown error)
> > 2019-07-12 23:20:34,412 INFO  ClientCnxn - Socket connection
> established, initiating session, client: /172.31.20.201:50032, server:
> ReplicationFt-masters-1/172.31.20.201:2181
> > 2019-07-12 23:20:34,413 INFO  ClientCnxn - Session establishment
> complete on server ReplicationFt-masters-1/172.31.20.201:2181, sessionid
> = 0x16be87b7d400004, negotiated timeout = 40000
> > 2019-07-12 23:20:34,413 INFO  ConnectionStateManager - State change:
> RECONNECTED
> > 2019-07-12 23:20:34,414 INFO  ClientCnxn - Unable to read additional
> data from server sessionid 0x16be87b7d400004, likely server has closed
> socket, closing socket connection and attempting reconnect
> >
> > Server traces:
> > 2019-07-12 23:20:56,564 [myid:] - INFO  [NIOServerCxn.Factory:
> 0.0.0.0/0.0.0.0:2181:NIOServerCnxnFactory@192] - Accepted socket
> connection from /172.31.20.201:50092
> > 2019-07-12 23:20:56,564 [myid:] - INFO  [NIOServerCxn.Factory:
> 0.0.0.0/0.0.0.0:2181:ZooKeeperServer@921] - Client attempting to renew
> session 0x16be87b7d400004 at /172.31.20.201:50092
> > 2019-07-12 23:20:56,565 [myid:] - INFO  [NIOServerCxn.Factory:
> 0.0.0.0/0.0.0.0:2181:ZooKeeperServer@673] - Established session
> 0x16be87b7d400004 with negotiated timeout 40000 for client /
> 172.31.20.201:50092
> > 2019-07-12 23:20:56,566 [myid:] - WARN  [NIOServerCxn.Factory:
> 0.0.0.0/0.0.0.0:2181:ZooKeeperServer@735] - Received packet at server of
> unknown type 15
> > 2019-07-12 23:20:56,566 [myid:] - INFO  [NIOServerCxn.Factory:
> 0.0.0.0/0.0.0.0:2181:NIOServerCnxn@1008] - Closed socket connection for
> client /172.31.20.201:50092 which had sessionid 0x16be87b7d400004
> > 2019-07-12 23:20:56,566 [myid:] - ERROR [SyncThread:0:NIOServerCnxn@178]
> - Unexpected Exception:
> > java.nio.channels.CancelledKeyException
> >       at
> sun.nio.ch.SelectionKeyImpl.ensureValid(SelectionKeyImpl.java:73)
> >       at
> sun.nio.ch.SelectionKeyImpl.interestOps(SelectionKeyImpl.java:77)
> >       at
> org.apache.zookeeper.server.NIOServerCnxn.sendBuffer(NIOServerCnxn.java:151)
> >       at
> org.apache.zookeeper.server.NIOServerCnxn.sendResponse(NIOServerCnxn.java:1082)
> >       at
> org.apache.zookeeper.server.FinalRequestProcessor.processRequest(FinalRequestProcessor.java:391)
> >       at
> org.apache.zookeeper.server.SyncRequestProcessor.run(SyncRequestProcessor.java:169)
> > 2019-07-12 23:20:57,752 [myid:] - INFO  [NIOServerCxn.Factory:
> 0.0.0.0/0.0.0.0:2181:NIOServerCnxnFactory@192] - Accepted socket
> connection from /172.31.20.201:50094
> > 2019-07-12 23:20:57,753 [myid:] - INFO  [NIOServerCxn.Factory:
> 0.0.0.0/0.0.0.0:2181:ZooKeeperServer@921] - Client attempting to renew
> session 0x16be87b7d400004 at /172.31.20.201:50094
> > 2019-07-12 23:20:57,753 [myid:] - INFO  [NIOServerCxn.Factory:
> 0.0.0.0/0.0.0.0:2181:ZooKeeperServer@673] - Established session
> 0x16be87b7d400004 with negotiated timeout 40000 for client /
> 172.31.20.201:50094
> > 2019-07-12 23:20:57,754 [myid:] - WARN  [NIOServerCxn.Factory:
> 0.0.0.0/0.0.0.0:2181:ZooKeeperServer@735] - Received packet at server of
> unknown type 15
> > 2019-07-12 23:20:57,755 [myid:] - INFO  [NIOServerCxn.Factory:
> 0.0.0.0/0.0.0.0:2181:NIOServerCnxn@1008] - Closed socket connection for
> client /172.31.20.201:50094 which had sessionid 0x16be87b7d400004
> >
> >
> > Thanks,
> > Gokturk
>
>

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