Hi,
http://hadoop.apache.org/zookeeper/docs/current/zookeeperAdmin.html is a great
resource. It's rare to see a open source project think so much about practical
enterprise deployment and this is much appreciated.
There are a few more recommendations that I think would be useful to add to the
Mekaraj, Prashant wrote:
Hi,
http://hadoop.apache.org/zookeeper/docs/current/zookeeperAdmin.html
is a great resource. It's rare to see a open source project think so
much about practical enterprise deployment and this is much
appreciated.
Thanks!
There are a few more recommendations that I
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
https://issues.apache.org/jira/browse/ZOOKEEPER-427
However our solution when we noticed the problem was to kill the zookeeper
process and restart it.
After
12 servers? That's alot, if you dont' mind my asking why so many?
Typically we recommend 5 - that way you can have one down for
maintenance and still have a failure that doesn't bring down the cluster.
The "electing a leader" is probably the restarted machine attempting to
re-join the ensemble
12 was just to keep uniformity on our servers. Our clients are connecting from
the same 12 servers. Easily modifiable and perhaps we should look into
changing that.
The logs just seem to indicate that the servers that claim to have no server
running are continually attempting to elect a leade
I have a related question: what's the behavior of a cluster of 3 when
one is down? I've tried it and a leader is elected, but are there any
other caveats for this situation?
.. Adam
On Tue, Jan 12, 2010 at 2:40 PM, Patrick Hunt wrote:
> 12 servers? That's alot, if you dont' mind my asking why so
Hi Adam -
As long as a quorum of servers is running, ZK will be live. With majority
quorums, 2/3 is enough to keep going. In general, if fewer than half your
nodes have failed, ZK will keep on keeping on.
The main concern with a cluster of 2/3 machines is that a single further
failure will bring
In my last email I failded to include a log line that may be revelent as well
2010-01-12 18:33:10,658 [QuorumPeer:/0.0.0.0:2181] (QuorumCnxManager) DEBUG -
Queue size: 0
2010-01-12 18:33:10,659 [QuorumPeer:/0.0.0.0:2181] (FastLeaderElection) INFO -
Notification time out: 6400
We see this line
Doh - that makes total sense. For whatever reason I thought with 2
servers you couldn't get a majority :P
On Tue, Jan 12, 2010 at 3:17 PM, Henry Robinson wrote:
> Hi Adam -
>
> As long as a quorum of servers is running, ZK will be live. With majority
> quorums, 2/3 is enough to keep going. In gen
Nick Bailey wrote:
In my last email I failded to include a log line that may be revelent as well
2010-01-12 18:33:10,658 [QuorumPeer:/0.0.0.0:2181] (QuorumCnxManager) DEBUG -
Queue size: 0
2010-01-12 18:33:10,659 [QuorumPeer:/0.0.0.0:2181] (FastLeaderElection) INFO -
Notification time out: 64
Thanks Patrik.
I can likely use zookeeper.
I try to use zookeeper in win32.
thanks a lot.
On Tue, Jan 12, 2010 at 2:35 AM, Patrick Hunt wrote:
> There are 3 principal components to zookeeper: java server and client, c
> client. The c client is used in the perl/python bindings (available in the
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