Hi Nick, Your assessment sounds correct, the issue seems to be caused
by the bug described in ZOOKEEPER-427. Can't you upgrade to a newer
release? Killing the leader should do it, but the bug will still be
there, so I recommend upgrading.
On Jan 12, 2010, at 10:52 PM, Nick Bailey wrote:
We are running zookeeper 3.1.0
Recently we noticed the cpu usage on our machines becoming
increasingly high and we believe the cause is
However our solution when we noticed the problem was to kill the
zookeeper process and restart it.
After doing that though it looks like the newly restarted zookeeper
server is continually attempting to elect a leader even though one
The process responses with 'imok' when asked, but the stat command
returns 'ZooKeeperServer not running'.
I belive that killing the current leader should trigger all servers
to do an election and solve the problem, but I'm not sure. Should
that be the course of action in this situation?
Also we have 12 servers, but 5 are currently not running according
to stat. So I guess this isn't a problem unless we lose another
one. We have plans to upgrade zookeeper to solve the cpu issue but
haven't been able to do that yet.
Any help appreciated,