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Description
This PR starts the work for #15946.
In order to use the replica which has the highest uptime, we first need the ability to select the uptime. This PR adds a new RPC to the tablet manager client interface for this.
In the next release, when this RPC is available on all the vttablets, we can use this RPC instead of
PrimaryStatus
to check for the availability of all the replicas in PRS. Currently we are throwing away the results ofPrimaryStatus
. Instead we can callUptime
and even use the results for better choosing the primary candidate.Related Issue(s)
Checklist
Deployment Notes