Leader crashing simulate

[Vineet Menon]

I am trying to simulate the crashing of nodes in zookeeper with curator.
I have modified the example program with LeaderSelector and LeaderSelectorListener for incorporating seperate individual programs which act as peers.

1. When I Cnrt + C the Java program, the next node takes considerable time about 30 s for the next peer to become leader. I have checked with the zookeeper for the nodes available and have noticed that the ephemeral znodes are alive even after the process is crashed.
I have attached the program codes with this post. AM I doing anything wrong with the code? or I should simulate the crash some way other than that?

2. When the leader actually relinquishes the leadership, by actually terminating itself, the switching over is quite smooth and fast.

What is happening here? What am I doing wrong?

[Jordan Zimmerman]

ZooKeeper has a session timeout. Ephemeral nodes are only deleted after the session timeout has expired. You specify the session timeout when you create the CuratorFramework instance. The default session timeout is 60 seconds.

-JZ 

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<App1.java><LeaderElector1.java>

[Vineet Menon]

thanks for the prompt reply,Jordan. Does it also depend on the tickTime value in ZooKeeper config file?
I just now changed it to 500 ms from 2000 ms and the time taken to elect the new leader came down from 30 ms to 4ms!

[Eric Pederson]

That is very interesting!   I have also seen very long (even greater than 30 secs) election times when the ZK leader is killed (I am actually using LeaderLatch).  I will try the tick time change to see if I see the same thing as you, Vineet.