Re: [Zookeeper-user] odd exceptions when using zookeeper

[Juan R. <Jua...@Su...>]

Forgot to mention, I am using the zookeeper-2.2.0.jar distribution.

Juan Ramirez wrote:
> Hi, I am trying to become familiar with the zookeeper API and am seeing 
> the following exceptions when attempting to create a node; any pointers 
> as to where to look for their cause would be greatly appreciated.
> 
> AFAIK, I am not doing anything special.  I am running ZK standalone 
> using JDK 1.6 and attempting to connect to it and create some nodes. 
> Other than dataDir, I am using the configuration values in 
> zoo_sample.cfg.  My attempt to create the nodes succeed sometimes, but 
> more often than not, I get some fashion of "Session Expired" errors.  I 
> am following com.yahoo.zookeeper.ZooKeeper.main() example and using 
> 5000ms for the client-side sessionTimeout.  Thanks in advance.
> 
> These happen in sequence:
> 
> java.io.IOException: TIMED OUT
>         at 
> com.yahoo.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:666)
> com.yahoo.zookeeper.KeeperException: KeeperErrorCode = ConnectionLoss 
> for /locks/
>         at com.yahoo.zookeeper.ZooKeeper.create(ZooKeeper.java:244)
>         at zookeeperclient.Main$Process.tryCreate(Main.java:142)
>         at zookeeperclient.Main$Process.<init>(Main.java:87)
>         at zookeeperclient.Main.main(Main.java:43)
> 
> java.io.IOException: Read error rc = -1 java.nio.DirectByteBuffer[pos=0 
> lim=4 cap=4]
>         at 
> com.yahoo.zookeeper.ClientCnxn$SendThread.doIO(ClientCnxn.java:484)
>         at 
> com.yahoo.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:705)
> 
> java.lang.NullPointerException
>         at com.yahoo.zookeeper.ClientCnxn.<init>(ClientCnxn.java:218)
>         at com.yahoo.zookeeper.ClientCnxn.<init>(ClientCnxn.java:194)
>         at com.yahoo.zookeeper.ZooKeeper.<init>(ZooKeeper.java:123)
>         at zookeeperclient.Main$Process.tryCreate(Main.java:151)
>         at zookeeperclient.Main$Process.<init>(Main.java:87)
>         at zookeeperclient.Main.main(Main.java:43)
> com.yahoo.zookeeper.KeeperException: KeeperErrorCode = SessionExpired 
> for /locks/
>         at com.yahoo.zookeeper.ZooKeeper.create(ZooKeeper.java:244)
>         at zookeeperclient.Main$Process.tryCreate(Main.java:142)
>         at zookeeperclient.Main$Process.<init>(Main.java:87)
>         at zookeeperclient.Main.main(Main.java:43)
>