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From "Jun Rao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-2867) an expired ZK session can be re-established
Date Wed, 09 Aug 2017 23:08:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16120800#comment-16120800
] 

Jun Rao commented on ZOOKEEPER-2867:
------------------------------------

[~hanm], I tried it locally. It seems that every time a session is closed. The log4j log will
log the deleting of ephemeral nodes with the session and type:closeSession in FinalRequestProcessor.


{code:java}
[2017-08-09 16:00:46,325] DEBUG Processing request:: sessionid:0x15dc93a4f1a0000 type:closeSession
cxid:0x3f zxid:0x39 txntype:-11 reqpath:n/a (org.apache.zookeeper.server.FinalRequestProcessor)
[2017-08-09 16:00:46,325] DEBUG Deleting ephemeral node /brokers/ids/0 for session 0x15dc93a4f1a0000
(org.apache.zookeeper.server.DataTree)
[2017-08-09 16:00:46,326] DEBUG sessionid:0x15dc93a4f1a0000 type:closeSession cxid:0x3f zxid:0x39
txntype:-11 reqpath:n/a (org.apache.zookeeper.server.FinalRequestProcessor)
{code}

However, for the above incident, I didn't find any logging of closeSession in the log4j log.


> 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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