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https://issues.apache.org/jira/browse/ZOOKEEPER-2867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16121101#comment-16121101
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Michael Han commented on ZOOKEEPER-2867:
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[~junrao] I also did experiments on my side, when a session is closed the
{{CommitProcessor}} should log something like:
{noformat}2017-08-09 22:41:49,824 [myid:2] - DEBUG
[SyncThread:2:CommitProcessor@386] - Committing request::
sessionid:0x10000134d2f0000 type:closeSession cxid:0x1 zxid:0x200000002
txntype:-11 reqpath:n/a{noformat}
But this is for 3.5, which has changed a lot in terms of how commit works, and
I realized you are using 3.4. But, from what you just referred about {{didn't
find any logging of closeSession in the log4j log}} I think we can conclude
that this specific session was not closed.
To circle back to original question - assuming this problematic session is not
closed (which is what existing evidence demonstrates), does this create any
inconsistency or confusions at higher level in your use case? Were you
expecting this session got closed based on what you observed at client side?
> 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
> Attachments: zk.0.formatted, zk.1.formatted
>
>
> 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 INFO
> org.apache.zookeeper.server.ZooKeeperServer Expiring session
> 0x25cd1e82c110001, timeout of 12000ms exceeded
> June 27th 2017, 22:04:39.001 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 INFO
> org.apache.zookeeper.server.PrepRequestProcessor Processed session
> termination for sessionid: 0x25cd1e82c110001
> June 27th 2017, 22:04:39.001 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, 22:05:20.324 INFO
> org.apache.zookeeper.server.quorum.Learner Revalidating client:
> 0x25cd1e82c110001
> June 27th 2017, 22:05:20.324 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 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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