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https://issues.apache.org/jira/browse/ZOOKEEPER-2616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15583965#comment-15583965
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Benjamin Jaton commented on ZOOKEEPER-2616:
-------------------------------------------

The extra log comes from my code, I added a logger.error(zk.getState()); after 
the while loop.

> ZK client fails to connect to ReadOnly server
> ---------------------------------------------
>
>                 Key: ZOOKEEPER-2616
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2616
>             Project: ZooKeeper
>          Issue Type: Bug
>    Affects Versions: 3.5.2
>            Reporter: Benjamin Jaton
>            Priority: Critical
>         Attachments: test2_client.log, test2_server.log, 
> zookeeper-Administrator-server-QA-E8WIN11.log
>
>
> Only 1 of the 3 nodes of the ensemble is started. The server successfully 
> started in readonly ("Read-only server started").
> {code:title=client}System.setProperty("readonlymode.enabled", "true");
> String cs = "QA-E8WIN11:2181,QA-E8WIN12:2181,QA-E8WIN13:2181";
> ZooKeeper zk = new ZooKeeper(cs, 30000, null, true);
>               
> // wait for connection
> while (!zk.getState().isConnected()) {
>       Thread.sleep(1000);
>       logger.error(zk.getState());
> }
> zk.getData("/", false, new Stat());
> logger.error("DONE");{code}
> The client code above manages to acquire a connection ("CONNECTEDREADONLY") 
> but the subsequent getData fails with ConnectionLoss:
> {code:title=client log}2016-10-17 14:37:43 ERROR TestCuratorReadOnly:31 - 
> CONNECTEDREADONLY
> 2016-10-17 14:39:49 ERROR o.a.z.ClientCnxn:526 - Error while calling watcher 
> java.lang.NullPointerException
>       at 
> org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:524) 
> [zookeeper-3.5.2-alpha.jar:3.5.2-alpha--1]
>       at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:499) 
> [zookeeper-3.5.2-alpha.jar:3.5.2-alpha--1]
> Exception in thread "main" 
> org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode 
> = ConnectionLoss for /
>       at org.apache.zookeeper.KeeperException.create(KeeperException.java:99)
>       at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
>       at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1956)
>       at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1985)
>       at TestCuratorReadOnly.main(TestCuratorReadOnly.java:33){code}
> Full server logs are attached, but here are the relevant parts:
> {code:title=server log}
> 2016-10-17 14:37:31,375 [myid:1] - INFO  
> [Thread-2:ReadOnlyZooKeeperServer@73] - Read-only server started
> (...)
> 2016-10-17 14:37:55,241 [myid:1] - INFO  
> [NIOServerCxnFactory.AcceptThread:/0.0.0.0:2181:NIOServerCnxnFactory$AcceptThread@296]
>  - Accepted socket connection from /10.11.12.4:40800
> 2016-10-17 14:37:55,250 [myid:1] - INFO  
> [NIOWorkerThread-1:ZooKeeperServer@964] - Client attempting to establish new 
> session at /10.11.12.4:40800
> 2016-10-17 14:37:55,255 [myid:1] - INFO  [ProcessThread(sid:1 
> cport:-1)::ZooKeeperServer@678] - Established session 0x100024619520000 with 
> negotiated timeout 30000 for client /10.11.12.4:40800
> (...)
>  
> [org.apache.ZooKeeperService:name0=ReplicatedServer_id1,name1=replica.1,name2=ReadOnlyServer,name3=Connections,name4=10.11.12.4,name5=0x100024619520000]
> 2016-10-17 14:38:26,929 [myid:1] - INFO  [ProcessThread(sid:1 
> cport:-1)::NIOServerCnxn@607] - Closed socket connection for client 
> /10.11.12.4:40800 which had sessionid 0x100024619520000{code}
> The client and server are using official 3.5.2-alpha.
> {code:title=zoo.cfg}autopurge.purgeInterval=3
> initLimit=10
> syncLimit=5
> autopurge.snapRetainCount=3
> snapCount=10000
> minSessionTimeout=5000
> maxSessionTimeout=600000
> tickTime=2000
> admin.commandURL=/commands
> quorumListenOnAllIPs=true
> dataDir=C:/workspace/zookeeper-3.5.2-alpha/data
> admin.serverPort=8080
> admin.enableServer=false
> standaloneEnabled=false
> dynamicConfigFile=C:/workspace/zookeeper-3.5.2-alpha/conf/zoo.cfg.dynamic.10000046b{code}
> {code:title=zoo.cfg.dynamic.10000046b}server.1=QA-E8WIN11:2888:3888:participant;0.0.0.0:2181
> server.2=QA-E8WIN12:2888:3888:participant;0.0.0.0:2181
> server.3=QA-E8WIN13:2888:3888:participant;0.0.0.0:2181{code}



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