80 lines
2.2 KiB
Plaintext
80 lines
2.2 KiB
Plaintext
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The FM cannot init groups/resources until the API is online.
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The DM expects FM Phase1 init to create the quorum resource.
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What happens if remote node goes down at various points along this path?
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Order of events is...
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Phase 1:
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Petition Other Node to Join
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NmJoin happens
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DmJoin happens
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- Registers with the gum and syncs database
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ApiInitPhase 1
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- Read-only access allowed to DM after this point
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FmInitPhase1
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- Performs synchronized join with GUM layer
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- Must build the quorum resource for DM layer below
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- Builds skeletal groups/resources (especially quorum resource)
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- Gets current state (owner and state) about all groups/resources
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DmUpdateJoin
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- hooks in callbacks for quorum notification and node events.
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NmJoinComplete
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- The node is now fully online
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Phase 2:
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ApiInitPhase2
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- API is now fully online
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FmInitPhase2
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- Complete building all Groups/Resources
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- Setup all state info retrieved from FmInitPhase1
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- FM is now officially online
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- Pull all groups that should be run on the local node
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- Signal events for all groups/resources
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FORM
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Phase 1
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DmForm -
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- Registers with gum.
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FmGetQuorumResource
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- gets the quorum resource and arbitrates for it.
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DmUpdateFormNewCluter-
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hooks in callbacks for quorum notifications,node events. This must
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be done before FmInitPhase1.
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FmInitPhase1
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- Performs synchronized join with GUM layer
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- Must build the quorum resource for DM layer below
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- Builds skeletal groups/resources (especially quorum resource)
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- Gets current state (owner and state) about all groups/resources
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DmRollChanges
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- quorum resource is brought online
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- dm layer waits on notification, and when online,
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changes in the quorum logs are applied.. for logging purposes.
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- Must be done after FmInitPhase1.
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Problem:
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- if a node crashes after FmInitPhase1 but before FmInitPhase2 then the
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state info retrieved in Phase1 is stale
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- Resources must be cleaned appropriately no matter where the failure occurs.
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- A join must convert to form appropriately.
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