Fix/copy before delete replication (#6064)

* fix(shell): volume.fix.replication misplaced volumes unsatisfying replication factor

* fix(shell): simplify replication check

* fix(shell): add test for satisfyReplicaCurrentLocation

weed/shell/command_volume_fix_replication.go

@@ -99,7 +99,7 @@ func (c *commandVolumeFixReplication) Do(args []string, commandEnv *CommandEnv,
 			replica := replicas[0]
 			replicaPlacement, _ := super_block.NewReplicaPlacementFromByte(byte(replica.info.ReplicaPlacement))
 			switch {
-			case replicaPlacement.GetCopyCount() > len(replicas):
+			case replicaPlacement.GetCopyCount() > len(replicas) || !satisfyReplicaCurrentLocation(replicaPlacement, replicas):
 				underReplicatedVolumeIds = append(underReplicatedVolumeIds, vid)
 			case isMisplaced(replicas, replicaPlacement):
 				misplacedVolumeIds = append(misplacedVolumeIds, vid)
@@ -377,6 +377,27 @@ func keepDataNodesSorted(dataNodes []location, diskType types.DiskType) {
 	})
 }
 
+func satisfyReplicaCurrentLocation(replicaPlacement *super_block.ReplicaPlacement, replicas []*VolumeReplica) bool {
+	existingDataCenters, existingRacks, _ := countReplicas(replicas)
+
+	if replicaPlacement.DiffDataCenterCount+1 > len(existingDataCenters) {
+		return false
+	}
+	if replicaPlacement.DiffRackCount+1 > len(existingRacks) {
+		return false
+	}
+	if replicaPlacement.SameRackCount > 0 {
+		foundSatisfyRack := false
+		for _, rackCount := range existingRacks {
+			if rackCount >= replicaPlacement.SameRackCount+1 {
+				foundSatisfyRack = true
+			}
+		}
+		return foundSatisfyRack
+	}
+	return true
+}
+
 /*
 	if on an existing data node {
 	  return false

weed/shell/command_volume_fix_replication_test.go

@@ -438,3 +438,90 @@ func TestPickingMisplacedVolumeToDelete(t *testing.T) {
 	}
 
 }
+
+func TestSatisfyReplicaCurrentLocation(t *testing.T) {
+
+	var tests = []testcase{
+		{
+			name:        "test 001",
+			replication: "001",
+			replicas: []*VolumeReplica{
+				{
+					location: &location{"dc1", "r1", &master_pb.DataNodeInfo{Id: "dn1"}},
+				},
+				{
+					location: &location{"dc1", "r2", &master_pb.DataNodeInfo{Id: "dn2"}},
+				},
+			},
+			expected: false,
+		},
+		{
+			name:        "test 010",
+			replication: "010",
+			replicas: []*VolumeReplica{
+				{
+					location: &location{"dc1", "r1", &master_pb.DataNodeInfo{Id: "dn1"}},
+				},
+				{
+					location: &location{"dc1", "r2", &master_pb.DataNodeInfo{Id: "dn2"}},
+				},
+			},
+			expected: true,
+		},
+		{
+			name:        "test 011",
+			replication: "011",
+			replicas: []*VolumeReplica{
+				{
+					location: &location{"dc1", "r1", &master_pb.DataNodeInfo{Id: "dn1"}},
+				},
+				{
+					location: &location{"dc1", "r1", &master_pb.DataNodeInfo{Id: "dn2"}},
+				},
+				{
+					location: &location{"dc1", "r2", &master_pb.DataNodeInfo{Id: "dn3"}},
+				},
+			},
+			expected: true,
+		},
+		{
+			name:        "test 110",
+			replication: "110",
+			replicas: []*VolumeReplica{
+				{
+					location: &location{"dc1", "r1", &master_pb.DataNodeInfo{Id: "dn1"}},
+				},
+				{
+					location: &location{"dc1", "r1", &master_pb.DataNodeInfo{Id: "dn2"}},
+				},
+				{
+					location: &location{"dc2", "r2", &master_pb.DataNodeInfo{Id: "dn3"}},
+				},
+			},
+			expected: true,
+		},
+		{
+			name:        "test 100",
+			replication: "100",
+			replicas: []*VolumeReplica{
+				{
+					location: &location{"dc1", "r1", &master_pb.DataNodeInfo{Id: "dn1"}},
+				},
+				{
+					location: &location{"dc1", "r2", &master_pb.DataNodeInfo{Id: "dn2"}},
+				},
+			},
+			expected: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			replicaPlacement, _ := super_block.NewReplicaPlacementFromString(tt.replication)
+			if satisfyReplicaCurrentLocation(replicaPlacement, tt.replicas) != tt.expected {
+				t.Errorf("%s: expect %v %v %+v",
+					tt.name, tt.expected, tt.replication, tt.replicas)
+			}
+		})
+	}
+}