cymbalhuang opened a new issue #2526: zookeeper会话超时，消费端注入(@reference)为空，调用抛空指针，重启后正常 URL: https://github.com/apache/incubator-dubbo/issues/2526 - [ ] I have searched the [issues](https://github.com/apache/incubator-dubbo/issues) of this repository and believe that this is not a duplicate. - [ ] I have checked the [FAQ](https://github.com/apache/incubator-dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate. ### Environment * Dubbo version: 2.6.1 * Operating System version: Linux version 3.10.0-693.el7.x86_64 ([email protected]) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-16) (GCC) ) * Java version: 1.8.0_171 * zk & zk client version: 3.4.11 * curator version: 4.0.1 ### 不定时出现zookeeper session timeout，重连后消费端引用@reference 为空，日志如下 ### 消费端jvm日志 ``` 04:22:37,427 WARN [main-SendThread(hostname:2181)][zookeeper.ClientCnxn:1111] - Client session timed out, have not heard from server in 33959ms for sessionid 0x10000018d38000b 04:23:07,081 INFO [main-SendThread(hostname:2181)][zookeeper.ClientCnxn:1159] - Client session timed out, have not heard from server in 33959ms for sessionid 0x10000018d38000b, closing socket connection and attempting reconnect 04:23:09,992 INFO [main-EventThread][state.ConnectionStateManager:237] - State change: SUSPENDED 04:23:10,186 INFO [main-SendThread(hostname:2181)][zookeeper.ClientCnxn:1035] - Opening socket connection to server hostname/172.16.10.121:2181. Will not attempt to authenticate using SASL (unknown error) 04:23:10,804 INFO [main-SendThread(hostname:2181)][zookeeper.ClientCnxn:877] - Socket connection established to hostname/172.16.10.121:2181, initiating session 04:23:10,998 WARN [main-SendThread(hostname:2181)][zookeeper.ClientCnxn:1288] - Unable to reconnect to ZooKeeper service, session 0x10000018d38000b has expired 04:23:11,066 INFO [main-SendThread(hostname:2181)][zookeeper.ClientCnxn:1157] - Unable to reconnect to ZooKeeper service, session 0x10000018d38000b has expired, closing socket connection 04:23:11,164 WARN [main-EventThread][curator.ConnectionState:372] - Session expired event received 04:23:12,502 INFO [main-EventThread][zookeeper.ZooKeeper:441] - Initiating client connection, connectString=hostname:2181 sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@67f639d3 04:23:13,599 INFO [main-SendThread(hostname:2181)][zookeeper.ClientCnxn:1035] - Opening socket connection to server hostname/172.16.10.121:2181. Will not attempt to authenticate using SASL (unknown error) 04:23:13,671 INFO [main-SendThread(hostname:2181)][zookeeper.ClientCnxn:877] - Socket connection established to hostname/172.16.10.121:2181, initiating session 04:23:13,771 INFO [main-SendThread(hostname:2181)][zookeeper.ClientCnxn:1302] - Session establishment complete on server hostname/172.16.10.121:2181, sessionid = 0x10000018d38002b, negotiated timeout = 40000 04:23:13,672 INFO [main-EventThread][state.ConnectionStateManager:237] - State change: LOST 04:23:13,960 INFO [main-EventThread][state.ConnectionStateManager:237] - State change: RECONNECTED 04:23:14,708 INFO [main-EventThread][zookeeper.ClientCnxn:520] - EventThread shut down for session: 0x10000018d38000b ``` ### zookeeper服务器日志 ``` 2018-09-12 02:36:05,355 [myid:] - INFO [SessionTracker:ZooKeeperServer@354] - Expiring session 0x10000018dc20000, timeout of 40000ms exceeded 2018-09-12 02:36:05,356 [myid:] - INFO [SessionTracker:ZooKeeperServer@354] - Expiring session 0x10000018dc20002, timeout of 40000ms exceeded 2018-09-12 02:36:05,356 [myid:] - INFO [SessionTracker:ZooKeeperServer@354] - Expiring session 0x10000018dc20003, timeout of 40000ms exceeded 2018-09-12 02:36:05,356 [myid:] - INFO [ProcessThread(sid:0 cport:2181)::PrepRequestProcessor@487] - Processed session termination for sessionid: 0x10000018dc20000 2018-09-12 02:36:05,356 [myid:] - INFO [ProcessThread(sid:0 cport:2181)::PrepRequestProcessor@487] - Processed session termination for sessionid: 0x10000018dc20002 2018-09-12 02:36:05,357 [myid:] - INFO [ProcessThread(sid:0 cport:2181)::PrepRequestProcessor@487] - Processed session termination for sessionid: 0x10000018dc20003 2018-09-12 02:39:41,884 [myid:] - INFO [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxnFactory@215] - Accepted socket connection from /172.16.10.123:33164 2018-09-12 02:39:41,888 [myid:] - INFO [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:ZooKeeperServer@938] - Client attempting to establish new session at /172.16.10.123:33164 2018-09-12 02:39:41,996 [myid:] - INFO [SyncThread:0:ZooKeeperServer@683] - Established session 0x10000018d380001 with negotiated timeout 40000 for client /172.16.10.123:33164 ```
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