release-20.2: kvserver: allow healing ranges whose replicas are all lost #57941
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tbg
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irfansharif
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Dec 17, 2020
Introduces and implements an `ResetQuorumRequest` RPC. `ResetQuorumRequest` takes in the range id of a range that that is unavailable due to lost quorum and makes it available again, at the cost of losing all of the data in that range. Any existing replica, even one residing on the target node, will irrevocably be removed. ResetQuorumRequest first uses meta2 to identify the range descriptor. Then, it removes all replicas from the range descriptor and adds a store from the target node as the one designated survivor replica. This change is then written to meta2 and sent as a snapshot to a store local to the target node in order to use crdb internal upreplication and rebalancing mechanisms to create further replicas from this fresh snapshot. This RPC is meant to be called by the user directly. It will not work for ranges that have not lost quorum or for a meta range. Release note: None
…PC to restore quorum to a given range ID. Note that data on any surviving replicas will not be used to restore quorum. Instead, these replicas will be removed irrevocably. Release note: None.
...to the running cluster. Release note: None
Release note: None
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Backport:
cockroach debug reset-quorumactually connect" (cli: allowcockroach debug reset-quorumactually connect #57712)Please see individual PRs for details.
/cc @cockroachdb/release