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Merge pull request etcd-io#8153 from gyuho/leadership-transfer
*: expose Leadership Transfer API to clients
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Original file line number | Diff line number | Diff line change |
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// Copyright 2017 The etcd Authors | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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package integration | ||
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import ( | ||
"context" | ||
"testing" | ||
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"github.com/coreos/etcd/etcdserver/api/v3rpc/rpctypes" | ||
"github.com/coreos/etcd/integration" | ||
"github.com/coreos/etcd/pkg/testutil" | ||
) | ||
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func TestMaintenanceMoveLeader(t *testing.T) { | ||
defer testutil.AfterTest(t) | ||
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clus := integration.NewClusterV3(t, &integration.ClusterConfig{Size: 3}) | ||
defer clus.Terminate(t) | ||
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oldLeadIdx := clus.WaitLeader(t) | ||
targetIdx := (oldLeadIdx + 1) % 3 | ||
target := uint64(clus.Members[targetIdx].ID()) | ||
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cli := clus.Client(targetIdx) | ||
_, err := cli.MoveLeader(context.Background(), target) | ||
if err != rpctypes.ErrNotLeader { | ||
t.Fatalf("error expected %v, got %v", rpctypes.ErrNotLeader, err) | ||
} | ||
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cli = clus.Client(oldLeadIdx) | ||
_, err = cli.MoveLeader(context.Background(), target) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
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leadIdx := clus.WaitLeader(t) | ||
lead := uint64(clus.Members[leadIdx].ID()) | ||
if target != lead { | ||
t.Fatalf("new leader expected %d, got %d", target, lead) | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
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// Copyright 2017 The etcd Authors | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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package e2e | ||
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import ( | ||
"context" | ||
"fmt" | ||
"os" | ||
"testing" | ||
"time" | ||
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"github.com/coreos/etcd/clientv3" | ||
"github.com/coreos/etcd/pkg/testutil" | ||
"github.com/coreos/etcd/pkg/types" | ||
) | ||
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func TestCtlV3MoveLeader(t *testing.T) { | ||
defer testutil.AfterTest(t) | ||
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epc := setupEtcdctlTest(t, &configNoTLS, true) | ||
defer func() { | ||
if errC := epc.Close(); errC != nil { | ||
t.Fatalf("error closing etcd processes (%v)", errC) | ||
} | ||
}() | ||
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var leadIdx int | ||
var leaderID uint64 | ||
var transferee uint64 | ||
for i, ep := range epc.grpcEndpoints() { | ||
cli, err := clientv3.New(clientv3.Config{ | ||
Endpoints: []string{ep}, | ||
DialTimeout: 3 * time.Second, | ||
}) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
resp, err := cli.Status(context.Background(), ep) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
cli.Close() | ||
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if resp.Header.GetMemberId() == resp.Leader { | ||
leadIdx = i | ||
leaderID = resp.Leader | ||
} else { | ||
transferee = resp.Header.GetMemberId() | ||
} | ||
} | ||
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os.Setenv("ETCDCTL_API", "3") | ||
defer os.Unsetenv("ETCDCTL_API") | ||
cx := ctlCtx{ | ||
t: t, | ||
cfg: configNoTLS, | ||
dialTimeout: 7 * time.Second, | ||
epc: epc, | ||
} | ||
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tests := []struct { | ||
prefixes []string | ||
expect string | ||
}{ | ||
{ // request to non-leader | ||
cx.prefixArgs([]string{cx.epc.grpcEndpoints()[(leadIdx+1)%3]}), | ||
"no leader endpoint given at ", | ||
}, | ||
{ // request to leader | ||
cx.prefixArgs([]string{cx.epc.grpcEndpoints()[leadIdx]}), | ||
fmt.Sprintf("Leadership transferred from %s to %s", types.ID(leaderID), types.ID(transferee)), | ||
}, | ||
} | ||
for i, tc := range tests { | ||
cmdArgs := append(tc.prefixes, "move-leader", types.ID(transferee).String()) | ||
if err := spawnWithExpect(cmdArgs, tc.expect); err != nil { | ||
t.Fatalf("#%d: %v", i, err) | ||
} | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,87 @@ | ||
// Copyright 2017 The etcd Authors | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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package command | ||
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import ( | ||
"fmt" | ||
"strconv" | ||
"time" | ||
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"github.com/coreos/etcd/clientv3" | ||
"github.com/spf13/cobra" | ||
) | ||
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// NewMoveLeaderCommand returns the cobra command for "move-leader". | ||
func NewMoveLeaderCommand() *cobra.Command { | ||
cmd := &cobra.Command{ | ||
Use: "move-leader <transferee-member-id>", | ||
Short: "Transfers leadership to another etcd cluster member.", | ||
Run: transferLeadershipCommandFunc, | ||
} | ||
return cmd | ||
} | ||
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// transferLeadershipCommandFunc executes the "compaction" command. | ||
func transferLeadershipCommandFunc(cmd *cobra.Command, args []string) { | ||
if len(args) != 1 { | ||
ExitWithError(ExitBadArgs, fmt.Errorf("move-leader command needs 1 argument")) | ||
} | ||
target, err := strconv.ParseUint(args[0], 16, 64) | ||
if err != nil { | ||
ExitWithError(ExitBadArgs, err) | ||
} | ||
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c := mustClientFromCmd(cmd) | ||
eps := c.Endpoints() | ||
c.Close() | ||
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ctx, cancel := commandCtx(cmd) | ||
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// find current leader | ||
var leaderCli *clientv3.Client | ||
var leaderID uint64 | ||
for _, ep := range eps { | ||
cli, err := clientv3.New(clientv3.Config{ | ||
Endpoints: []string{ep}, | ||
DialTimeout: 3 * time.Second, | ||
}) | ||
if err != nil { | ||
ExitWithError(ExitError, err) | ||
} | ||
resp, err := cli.Status(ctx, ep) | ||
if err != nil { | ||
ExitWithError(ExitError, err) | ||
} | ||
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if resp.Header.GetMemberId() == resp.Leader { | ||
leaderCli = cli | ||
leaderID = resp.Leader | ||
break | ||
} | ||
cli.Close() | ||
} | ||
if leaderCli == nil { | ||
ExitWithError(ExitBadArgs, fmt.Errorf("no leader endpoint given at %v", eps)) | ||
} | ||
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var resp *clientv3.MoveLeaderResponse | ||
resp, err = leaderCli.MoveLeader(ctx, target) | ||
cancel() | ||
if err != nil { | ||
ExitWithError(ExitError, err) | ||
} | ||
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display.MoveLeader(leaderID, target, *resp) | ||
} |
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