Thanks, Ted.
This would solve power feed problem. Unfortunately we have similar
situation with the switches. Failure of one will bring half of the
servers down. It is understood that changing/adjusting hardware
infrastructure can solve the problem. Unfortunately this is not under my
control. S
A small rack mounted UPS doesn't require a full-scale rebuild of
infrastructure and would get you through almost all power fail scenarios.
If you have 5 ZK servers, put 3 on one power source and give one of them
the UPS. Then give put the other 2 on the second power source. If power
source A fai
Thanks, Flavio, I appreciate your feedback.
Three power sources obviously would solve the problem. Unfortunately at
this moment it does not seem to be feasible (we will need to rebuild the
whole existing infrastructure). This is the main reason why I am
exploring possible alternative (besides t
Your EC2 suggestion sounds reasonable. If your deployment is able to form a local quorum most of the time, then you would be able to get a quorum of acks most of the time. One concern is that the EC2 replica might lag behind badly, which may force the leader to either slow down or to drop the conne
On Wed, Jul 14, 2010 at 2:16 PM, Sergei Babovich
wrote:
> Yep... I see. This is a problem. Any better idea?
>
I think that the production of slightly elaborate quorum rules to handle
specific failure modes isn't a reasonable thing. What you need to do in
conjunction is to estimate likelihoods of
Thanks, Flavio,
Yep... I see. This is a problem. Any better idea?
As an alternative option we could probably consider running single ZK
node on EC2 - only in order to handle this specific case. Does it make
sense to you? Is it feasible? Would it result in considerable
performance impact due to
Just another implementation of QuorumVerifier (based on existing
implementation: either majority or hierarchical quorums). Probably
hierarchical quorum is simplest to adjust - it already has notion of
groups, etc.
On 07/14/2010 04:46 PM, Benjamin Reed wrote:
by custom QuorumVerifier are you r
Hi Sergei, I'm not sure what the implementation of QuorumVerifier you have in mind would look like to make your setting work. Even if you don't have partitions, variation in message delays can cause inconsistencies in your ZooKeeper cluster. Keep in mind that we make the assumption that quorums int
by custom QuorumVerifier are you referring to
http://hadoop.apache.org/zookeeper/docs/r3.3.1/zookeeperHierarchicalQuorums.html
?
ben
On 07/14/2010 12:43 PM, Sergei Babovich wrote:
Hi,
We are currently evaluating use of ZK in our infrastructure. In our
setup we have a set of servers running fr
Hi,
We are currently evaluating use of ZK in our infrastructure. In our
setup we have a set of servers running from two different power feeds.
If one power feed goes away so does half of the servers. This makes
problematic to configure ZK ensemble that would tolerate such outage.
The network p
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