functional/rpcpb: add "SIGQUIT_AND_REMOVE_QUORUM_AND_RESTORE_SNAPSHOT_FROM_SCRATCH"

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

functional/rpcpb/rpc.pb.go

@@ -202,6 +202,28 @@ const (
 	// snapshot from the newly elected leader. As always, after recovery, each
 	// member must be able to process client requests.
 	FailureCase_SIGQUIT_AND_REMOVE_LEADER_UNTIL_TRIGGER_SNAPSHOT FailureCase = 13
+	// SIGQUIT_AND_REMOVE_QUORUM_AND_RESTORE_SNAPSHOT_FROM_SCRATCH first stops
+	// majority number of nodes, deletes data directories on those quorum nodes,
+	// to make the whole cluster inoperable. Now that quorum and their data are
+	// totally destroyed, cluster cannot even remove unavailable nodes (e.g. 2
+	// out of 3 are lost, so no leader can be elected).
+	// Let's assume 3-node cluster of node A, B, and C. One day, node A and B
+	// are destroyed and all their data are gone. The only viable solution is
+	// to recover from C's latest snapshot.
+	// Tester simulates this scenario by:
+	//  1. Download snapshot from node C, before destroying node A and B.
+	//  2. Destroy node A and B, and make the whole cluster inoperable.
+	//  3. Now node C cannot operate either.
+	//  4. SIGTERM node C and remove its data directories.
+	//  5. Restore a new seed member from node C's latest snapshot file.
+	//  6. Add another member to establish 2-node cluster.
+	//  7. Add another member to establish 3-node cluster.
+	// The expected behavior is that etcd successfully recovers from such
+	// disastrous situation as only 1-node survives out of 3-node cluster,
+	// new members joins the existing cluster, and previous data from snapshot
+	// are still preserved after recovery process. As always, after recovery,
+	// each member must be able to process client requests.
+	FailureCase_SIGQUIT_AND_REMOVE_QUORUM_AND_RESTORE_SNAPSHOT_FROM_SCRATCH FailureCase = 14
 	// BLACKHOLE_PEER_PORT_TX_RX_ONE_FOLLOWER drops all outgoing/incoming
 	// packets from/to the peer port on a randomly chosen follower
 	// (non-leader), and waits for "failure-delay-ms" until recovery.
@@ -388,6 +410,7 @@ var FailureCase_name = map[int32]string{
 	11:  "SIGQUIT_AND_REMOVE_ONE_FOLLOWER_UNTIL_TRIGGER_SNAPSHOT",
 	12:  "SIGQUIT_AND_REMOVE_LEADER",
 	13:  "SIGQUIT_AND_REMOVE_LEADER_UNTIL_TRIGGER_SNAPSHOT",
+	14:  "SIGQUIT_AND_REMOVE_QUORUM_AND_RESTORE_SNAPSHOT_FROM_SCRATCH",
 	100: "BLACKHOLE_PEER_PORT_TX_RX_ONE_FOLLOWER",
 	101: "BLACKHOLE_PEER_PORT_TX_RX_ONE_FOLLOWER_UNTIL_TRIGGER_SNAPSHOT",
 	102: "BLACKHOLE_PEER_PORT_TX_RX_LEADER",
@@ -422,6 +445,7 @@ var FailureCase_value = map[string]int32{
 	"SIGQUIT_AND_REMOVE_ONE_FOLLOWER_UNTIL_TRIGGER_SNAPSHOT":           11,
 	"SIGQUIT_AND_REMOVE_LEADER":                                        12,
 	"SIGQUIT_AND_REMOVE_LEADER_UNTIL_TRIGGER_SNAPSHOT":                 13,
+	"SIGQUIT_AND_REMOVE_QUORUM_AND_RESTORE_SNAPSHOT_FROM_SCRATCH":      14,
 	"BLACKHOLE_PEER_PORT_TX_RX_ONE_FOLLOWER":                           100,
 	"BLACKHOLE_PEER_PORT_TX_RX_ONE_FOLLOWER_UNTIL_TRIGGER_SNAPSHOT":    101,
 	"BLACKHOLE_PEER_PORT_TX_RX_LEADER":                                 102,
@@ -4214,162 +4238,164 @@ var (
 func init() { proto.RegisterFile("rpcpb/rpc.proto", fileDescriptorRpc) }
 
 var fileDescriptorRpc = []byte{
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+	0xc5, 0xfa, 0xd0, 0xb1, 0x50, 0xcd, 0xb4, 0x4b, 0xff, 0x2c, 0xdc, 0x0e, 0x01, 0x18, 0xfd, 0x55,
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+	0x0a, 0x5c, 0x02, 0x0b, 0x96, 0x6d, 0x55, 0x9c, 0x6a, 0xbd, 0xe6, 0xa2, 0xad, 0x5a, 0x8d, 0xd5,
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+	0x7b, 0xf9, 0xf7, 0x95, 0x53, 0x2f, 0xbf, 0x5a, 0x51, 0xbe, 0xfc, 0x6a, 0x45, 0xf9, 0xdb, 0x57,
+	0x2b, 0xca, 0xaf, 0xbe, 0x5e, 0x39, 0xb5, 0x7d, 0x86, 0xfd, 0xf8, 0x76, 0xff, 0xff, 0x01, 0x00,
+	0x00, 0xff, 0xff, 0xf7, 0xfb, 0xe3, 0x68, 0xc5, 0x1b, 0x00, 0x00,
 }

functional/rpcpb/rpc.proto

@@ -322,6 +322,29 @@ enum FailureCase {
   // member must be able to process client requests.
   SIGQUIT_AND_REMOVE_LEADER_UNTIL_TRIGGER_SNAPSHOT = 13;
 
+  // SIGQUIT_AND_REMOVE_QUORUM_AND_RESTORE_SNAPSHOT_FROM_SCRATCH first stops
+  // majority number of nodes, deletes data directories on those quorum nodes,
+  // to make the whole cluster inoperable. Now that quorum and their data are
+  // totally destroyed, cluster cannot even remove unavailable nodes (e.g. 2
+  // out of 3 are lost, so no leader can be elected).
+  // Let's assume 3-node cluster of node A, B, and C. One day, node A and B
+  // are destroyed and all their data are gone. The only viable solution is
+  // to recover from C's latest snapshot.
+  // Tester simulates this scenario by:
+  //  1. Download snapshot from node C, before destroying node A and B.
+  //  2. Destroy node A and B, and make the whole cluster inoperable.
+  //  3. Now node C cannot operate either.
+  //  4. SIGTERM node C and remove its data directories.
+  //  5. Restore a new seed member from node C's latest snapshot file.
+  //  6. Add another member to establish 2-node cluster.
+  //  7. Add another member to establish 3-node cluster.
+  // The expected behavior is that etcd successfully recovers from such
+  // disastrous situation as only 1-node survives out of 3-node cluster,
+  // new members joins the existing cluster, and previous data from snapshot
+  // are still preserved after recovery process. As always, after recovery,
+  // each member must be able to process client requests.
+  SIGQUIT_AND_REMOVE_QUORUM_AND_RESTORE_SNAPSHOT_FROM_SCRATCH = 14;
+
   // BLACKHOLE_PEER_PORT_TX_RX_ONE_FOLLOWER drops all outgoing/incoming
   // packets from/to the peer port on a randomly chosen follower
   // (non-leader), and waits for "failure-delay-ms" until recovery.