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Consider a replica set with three nodes: A, B, C. 'A' is PRIMARY, 'B' and 'C' are SECONDARY.

If there is a network partition between 'A' and 'C', then:

A is still PRIMARY because it can see a majority of the set
C will start an election trying to become PRIMARY
- It can see a majority of the set
- It cannot see a primary

If, for whatever reason, 'B' allows 'C' to become PRIMARY, then the set will have two PRIMARY nodes until one of them is stepped down.

is duplicated by

SERVER-8145 Two primaries for the same replica set

is related to

SERVER-9756 network partition where minority was primary and stayed primary

related to

SERVER-9283 lastHeartbeatRecv flaps between invalid and valid dates

Assignee:: Eric Milkie
Reporter:: William Zola (Inactive)
Participants:: auto, Eric Milkie, Scott Hernandez, Volodymyr Gren, William Zola
Votes:: 0 Vote for this issue
Watchers:: 12 Start watching this issue