support leader election for charms
Bug #1258485 reported by
John A Meinel
This bug affects 4 people
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| juju-core |
Fix Released
|
High
|
John A Meinel | ||
| cassandra (Juju Charms Collection) |
Fix Released
|
High
|
Unassigned | ||
| postgresql (Juju Charms Collection) |
Fix Released
|
Critical
|
Unassigned | ||
Bug Description
It is difficult for charms to negotiate amongst each other to decide on a leader. (Unit A may see Units B and C but units B and C do not see eachother)
It should be easy to leverage the central nature of the Juju DB to provide a point of reference for them to collaborate.
The idea is outlined in this doc: https:/
Marking this as High because we would like to see it in this cycle.
Revision history for this message
| Stuart Bishop (stub) wrote | #1 |
| Changed in postgresql (Juju Charms Collection): | |
| status: | New → Triaged |
| importance: | Undecided → High |
| importance: | High → Critical |
Revision history for this message
| Stuart Bishop (stub) wrote | #2 |
| Changed in cassandra (Juju Charms Collection): | |
| status: | New → Triaged |
| importance: | Undecided → High |
| Changed in juju-core: | |
| importance: | High → Medium |
Revision history for this message
| Curtis Hovey (sinzui) wrote | #3 |
| Changed in juju-core: | |
| importance: | Medium → High |
| milestone: | none → 1.23-beta4 |
| assignee: | nobody → John A Meinel (jameinel) |
| status: | Triaged → Fix Committed |
| Changed in juju-core: | |
| status: | Fix Committed → Fix Released |
| Changed in cassandra (Juju Charms Collection): | |
| status: | Triaged → Fix Released |
| Changed in postgresql (Juju Charms Collection): | |
| status: | Triaged → In Progress |
| Changed in postgresql (Juju Charms Collection): | |
| status: | In Progress → Fix Released |
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Not so much difficult, but impossible. The separate sets of units elect different leaders, and you have a split-brain. You can't resolve this without arbitrarily throwing away information from one of the leaders.