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From "Jun Rao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ZOOKEEPER-2867) an expired ZK session can be re-established
Date Fri, 04 Aug 2017 23:59:00 GMT
Jun Rao created ZOOKEEPER-2867:
----------------------------------

             Summary: an expired ZK session can be re-established
                 Key: ZOOKEEPER-2867
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2867
             Project: ZooKeeper
          Issue Type: Bug
    Affects Versions: 3.4.10
            Reporter: Jun Rao


Not sure if this is a real bug, but I found an instance when a ZK client seems to be able
to renew a session already expired by the ZK server.

>From ZK server log, session 25cd1e82c110001 was expired at 22:04:39.

{code:java}
June 27th 2017, 22:04:39.000	1	INFO	org.apache.zookeeper.server.ZooKeeperServer	Expiring session
0x25cd1e82c110001, timeout of 12000ms exceeded
June 27th 2017, 22:04:39.001	1	DEBUG	org.apache.zookeeper.server.quorum.Leader	Proposing::
sessionid:0x25cd1e82c110001 type:closeSession cxid:0x0 zxid:0x200000fc4 txntype:-11 reqpath:n/a
June 27th 2017, 22:04:39.001	1	INFO	org.apache.zookeeper.server.PrepRequestProcessor	Processed
session termination for sessionid: 0x25cd1e82c110001
June 27th 2017, 22:04:39.001	1	DEBUG	org.apache.zookeeper.server.quorum.CommitProcessor	Processing
request:: sessionid:0x25cd1e82c110001 type:closeSession cxid:0x0 zxid:0x200000fc4 txntype:-11
reqpath:n/a
June 27th 2017, 22:05:20.323	2	DEBUG	org.apache.zookeeper.server.quorum.Leader	Proposing::
sessionid:0x25cd1e82c110001 type:setData cxid:0xdc zxid:0x30000047b txntype:5 reqpath:n/a
June 27th 2017, 22:05:20.323	2	DEBUG	org.apache.zookeeper.server.quorum.CommitProcessor	Processing
request:: sessionid:0x25cd1e82c110001 type:setData cxid:0xdc zxid:0x30000047b txntype:5 reqpath:n/a
June 27th 2017, 22:05:20.324	1	INFO	org.apache.zookeeper.server.quorum.Learner	Revalidating
client: 0x25cd1e82c110001
June 27th 2017, 22:05:20.324	1	INFO	org.apache.zookeeper.server.ZooKeeperServer	Client attempting
to renew session 0x25cd1e82c110001 at /100.96.5.6:47618
June 27th 2017, 22:05:20.325	1	INFO	org.apache.zookeeper.server.ZooKeeperServer	Established
session 0x25cd1e82c110001 with negotiated timeout 12000 for client /100.96.5.6:47618
{code}

>From ZK client's log, it was able to renew the expired session on 22:05:20.

{code:java}
June 27th 2017, 22:05:18.590	INFO	org.apache.zookeeper.ClientCnxn	Client session timed out,
have not heard from server in 4485ms for sessionid 0x25cd1e82c110001, closing socket connection
and attempting reconnect	0
June 27th 2017, 22:05:18.590	WARN	org.apache.zookeeper.ClientCnxn	Client session timed out,
have not heard from server in 4485ms for sessionid 0x25cd1e82c110001	0
June 27th 2017, 22:05:19.325	WARN	org.apache.zookeeper.ClientCnxn	SASL configuration failed:
javax.security.auth.login.LoginException: No JAAS configuration section named 'Client' was
found in specified JAAS configuration file: '/opt/confluent/etc/kafka/server_jaas.conf'. Will
continue connection to Zookeeper server without SASL authentication, if Zookeeper server allows
it.	0
June 27th 2017, 22:05:19.326	INFO	org.apache.zookeeper.ClientCnxn	Opening socket connection
to server 100.65.188.168/100.65.188.168:2181	0
June 27th 2017, 22:05:20.324	INFO	org.apache.zookeeper.ClientCnxn	Socket connection established
to 100.65.188.168/100.65.188.168:2181, initiating session	0
June 27th 2017, 22:05:20.327	INFO	org.apache.zookeeper.ClientCnxn	Session establishment complete
on server 100.65.188.168/100.65.188.168:2181, sessionid = 0x25cd1e82c110001, negotiated timeout
= 12000	0

{code}




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