zookeeper fails to start - broken snapshot?
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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
15:03.
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
actions.
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, Łukasz Osipiuk
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