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From "Gary Yao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-12384) Rolling the etcd servers causes "Connected to an old server; r-o mode will be unavailable"
Date Thu, 16 May 2019 10:46:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-12384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16841209#comment-16841209
] 

Gary Yao commented on FLINK-12384:
----------------------------------

[~haf] I checked the ZK client code and the warning is not something to be concerned about.
The client is talking to a ZK server that does not support the r-o mode.

Also see:
https://github.com/apache/zookeeper/blob/e45551fc7c691332ace7bff81926855e42ac2239/zookeeper-server/src/main/java/org/apache/zookeeper/ClientCnxnSocket.java#L147-L149
http://zookeeper-user.578899.n2.nabble.com/Connected-to-an-old-server-r-o-mode-will-be-unavailable-td7578775.html

Is your cluster not starting up correctly or recovering the jobs? If that is the case, I would
like to see the complete jobmanager logs if possible.

> Rolling the etcd servers causes "Connected to an old server; r-o mode will be unavailable"
> ------------------------------------------------------------------------------------------
>
>                 Key: FLINK-12384
>                 URL: https://issues.apache.org/jira/browse/FLINK-12384
>             Project: Flink
>          Issue Type: Bug
>          Components: Runtime / Coordination
>            Reporter: Henrik
>            Priority: Major
>
> {code:java}
> [tm] 2019-05-01 13:30:53,316 INFO  org.apache.flink.shaded.zookeeper.org.apache.zookeeper.ZooKeeper 
- Initiating client connection, connectString=analytics-zetcd:2181 sessionTimeout=60000 watcher=org.apache.flink.shaded.curator.org.apache.curator.ConnectionState@5c8eee0f
> [tm] 2019-05-01 13:30:53,384 WARN  org.apache.flink.shaded.zookeeper.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: '/tmp/jaas-3674237213070587877.conf'.
Will continue connection to Zookeeper server without SASL authentication, if Zookeeper server
allows it.
> [tm] 2019-05-01 13:30:53,395 INFO  org.apache.flink.shaded.zookeeper.org.apache.zookeeper.ClientCnxn 
- Opening socket connection to server analytics-zetcd.default.svc.cluster.local/10.108.52.97:2181
> [tm] 2019-05-01 13:30:53,395 INFO  org.apache.flink.runtime.taskexecutor.TaskManagerRunner      
- Using configured hostname/address for TaskManager: 10.1.2.173.
> [tm] 2019-05-01 13:30:53,401 ERROR org.apache.flink.shaded.curator.org.apache.curator.ConnectionState 
- Authentication failed
> [tm] 2019-05-01 13:30:53,418 INFO  org.apache.flink.runtime.rpc.akka.AkkaRpcServiceUtils        
- Trying to start actor system at 10.1.2.173:0
> [tm] 2019-05-01 13:30:53,420 INFO  org.apache.flink.shaded.zookeeper.org.apache.zookeeper.ClientCnxn 
- Socket connection established to analytics-zetcd.default.svc.cluster.local/10.108.52.97:2181,
initiating session
> [tm] 2019-05-01 13:30:53,500 WARN  org.apache.flink.shaded.zookeeper.org.apache.zookeeper.ClientCnxnSocket 
- Connected to an old server; r-o mode will be unavailable
> [tm] 2019-05-01 13:30:53,500 INFO  org.apache.flink.shaded.zookeeper.org.apache.zookeeper.ClientCnxn 
- Session establishment complete on server analytics-zetcd.default.svc.cluster.local/10.108.52.97:2181,
sessionid = 0xbf06a739001d446, negotiated timeout = 60000
> [tm] 2019-05-01 13:30:53,525 INFO  org.apache.flink.shaded.curator.org.apache.curator.framework.state.ConnectionStateManager 
- State change: CONNECTED{code}
> Repro:
> Start an etcd-cluster, with e.g. etcd-operator, with three members. Start zetcd in front.
Configure the sesssion cluster to go against zetcd.
> Ensure the job can start successfully.
> Now, kill the etcd pods one by one, letting the quorum re-establish in between, so that
the cluster is still OK.
> Now restart the job/tm pods. You'll end up in this no-mans-land.
>  
> —
> Workaround: clean out the etcd cluster and remove all its data, however, this resets
all time windows and state, despite having that saved in GCS, so it's a crappy workaround.
>  
> –
>  
> flink-conf.yaml
> {code:java}
> parallelism.default: 1
> rest.address: analytics-job
> jobmanager.rpc.address: analytics-job # = resource manager's address too
> jobmanager.heap.size: 1024m
> jobmanager.rpc.port: 6123
> jobmanager.slot.request.timeout: 30000
> resourcemanager.rpc.port: 6123
> high-availability.jobmanager.port: 6123
> blob.server.port: 6124
> queryable-state.server.ports: 6125
> taskmanager.heap.size: 1024m
> taskmanager.numberOfTaskSlots: 1
> web.log.path: /var/lib/log/flink/jobmanager.log
> rest.port: 8081
> rest.bind-address: 0.0.0.0
> web.submit.enable: false
> high-availability: zookeeper
> high-availability.storageDir: gs://example_analytics/flink/zetcd/
> high-availability.zookeeper.quorum: analytics-zetcd:2181
> high-availability.zookeeper.path.root: /flink
> high-availability.zookeeper.client.acl: open
> state.backend: rocksdb
> state.checkpoints.num-retained: 3
> state.checkpoints.dir: gs://example_analytics/flink/checkpoints
> state.savepoints.dir: gs://example_analytics/flink/savepoints
> state.backend.incremental: true
> state.backend.async: true
> fs.hdfs.hadoopconf: /opt/flink/hadoop
> log.file: /var/lib/log/flink/jobmanager.log{code}



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