zookeeper fails to start - broken snapshot?

                 Key: ZOOKEEPER-713
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-713
             Project: Zookeeper
          Issue Type: Bug
    Affects Versions: 3.2.2
         Environment: debian lenny; ia64; xen virtualization
            Reporter: Lukasz Osipiuk
         Attachments: node1-zookeeper.log.gz, node2-zookeeper.log.gz, zoo.cfg

Hi guys,

The following is not a bug report but rather a question - but as I am attaching 
large files I am posting it here rather than on mailinglist.

Today we had major failure in our production environment. Machines in zookeeper 
cluster gone wild and all clients got disconnected.
We tried to restart whole zookeeper cluster but cluster got stuck in leader 
election phase.

Calling stat command on any machine in the cluster resulted in 'ZooKeeperServer 
not running' message
In one of logs I noticed 'Invalid snapshot'  message which disturbed me a bit.

We did not manage to make cluster work again with data. We deleted all 
version-2 directories on all nodes and then cluster started up without problems.
Is it possible that snapshot/log data got corrupted in a way which made cluster 
unable to start?
Fortunately we could rebuild data we store in zookeeper as we use it only for 
locks and most of nodes is ephemeral.

I am attaching contents of version-2 directory from all nodes and server logs.
Source problem occurred some time before 15. First cluster restart happened at 
At some point later we experimented with deleting version-2 directory so I 
would not look at following restart because they can be misleading due to our 

I am also attaching zoo.cfg. Maybe something is wrong at this place. 
As I know look into logs i see read timeout during initialization phase after 
20secs (initLimit=10, tickTime=2000).
Maybe all I have to do is increase one or other. which one? Are there any 
downsides of increasing tickTime.

Best regards, Ɓukasz Osipiuk

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