[Zen2] Only elect master-eligible nodes #35996
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Today any node can win an election. However, the whole point of master-eligibility is that master-ineligible nodes should not be elected as the leader; furthermore master-ineligible nodes do not have any outgoing STATE channels so cannot publish cluster states, so their leadership is ineffective and disruptive. This change ensures that the elected leader is master-eligible by preventing master-ineligible nodes from scheduling an election.
DaveCTurner
added
>bug
v7.0.0
:Distributed Coordination/Cluster Coordination
|
Pinging @elastic/es-distributed |
ywelsch
reviewed
Nov 28, 2018
| internalCluster().startDataOnlyNode(); | ||
| internalCluster().stopCurrentMasterNode(); | ||
| // There's only one master-eligible node left so it should elect itself pretty quickly. | ||
| assertFalse(client().admin().cluster().prepareHealth().setTimeout(TimeValue.timeValueSeconds(10)).get().isTimedOut()); |
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can we write this as a CoordinatorTest?
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We can - see 2de0feb.
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Today any node can win an election. However, the whole point of
master-eligibility is that master-ineligible nodes should not be elected as the
leader; furthermore master-ineligible nodes do not have any outgoing STATE
channels so cannot publish cluster states, so their leadership is ineffective
and disruptive.
This change ensures that the elected leader is master-eligible by preventing
master-ineligible nodes from scheduling an election.