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From Göktürk Gezer <gokt...@alluxio.com>
Subject Is 3.5.5 client compatible with 3.4.x servers
Date Fri, 12 Jul 2019 23:33:56 GMT
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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