Andrew Wheat created CAMEL-5548:
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Summary: It is possible to get a split-brain scenario among
applications managed by a zookeeper master election
Key: CAMEL-5548
URL: https://issues.apache.org/jira/browse/CAMEL-5548
Project: Camel
Issue Type: Bug
Components: camel-zookeeper
Affects Versions: 2.10.0
Reporter: Andrew Wheat
Setup:
Three Zookeeper instances (Z1, Z2, Z3) in two datacenters; A and B. Z1 and Z2
are in data center A; Z3 is in data center B.
Four Application servers (A1-A4) split evenly between the two datacenters,
using a camel route to determine if the a message should be sent (quartz ->
zookeeperpolicy -> activemq)
The master node is A3 in data center B.
When the network fails between the two data centers, The ZK servers in data
center A have quorum.
When something causes an election to occur in data center A, one of A1 or A2 is
elected.
Given that no election has occurred in data center B, A3 is also marked as
master.
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Proposed solution:
A change in the zookeeper structure should trigger a re-election among the
application servers. Since A3 and A4 will be connected to a zookeeper that does
not have quorum, neither A3 or A4 will be elected as master.
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