Jun Rao created ZOOKEEPER-2867:
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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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