Unending Leader Elections : WAN configuration
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Key: ZOOKEEPER-498
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-498
Project: Zookeeper
Issue Type: Bug
Components: leaderElection
Affects Versions: 3.2.0
Environment: Each machine:
CentOS 5.2 64-bit
2GB ram
java version "1.6.0_13"
Java(TM) SE Runtime Environment (build 1.6.0_13-b03)
Java HotSpot(TM) 64-Bit Server VM (build 11.3-b02, mixed
Network Topology:
DC : central data center
POD(N): remote data center
Zookeeper Topology:
Leaders may be elected only in DC (weight = 1)
Only followers are elected in PODS (weight = 0)
Reporter: Todd Greenwood-Geer
Priority: Critical
Fix For: 3.2.1
In a WAN configuration, ZooKeeper is endlessly electing, terminating, and
re-electing a ZooKeeper leader. The WAN configuration involves two groups, a
central DC group of ZK servers that have a voting weight = 1, and a group of
servers in remote pods with a voting weight of 0.
What we expect to see is leaders elected only in the DC, and the pods to
contain only followers. What we are seeing is a continuous cycling of leaders.
We have seen this consistently with 3.2.0, 3.2.0 + recommended patches (473,
479, 481, 491), and now release 3.2.1.
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