go.etcd.io/etcd@v3.3.27+incompatible/integration/metrics_test.go (about)

     1  // Copyright 2017 The etcd Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package integration
    16  
    17  import (
    18  	"context"
    19  	"strconv"
    20  	"testing"
    21  	"time"
    22  
    23  	pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
    24  	"github.com/coreos/etcd/pkg/testutil"
    25  )
    26  
    27  // TestMetricDbSizeBoot checks that the db size metric is set on boot.
    28  func TestMetricDbSizeBoot(t *testing.T) {
    29  	defer testutil.AfterTest(t)
    30  	clus := NewClusterV3(t, &ClusterConfig{Size: 1})
    31  	defer clus.Terminate(t)
    32  
    33  	v, err := clus.Members[0].Metric("etcd_debugging_mvcc_db_total_size_in_bytes")
    34  	if err != nil {
    35  		t.Fatal(err)
    36  	}
    37  
    38  	if v == "0" {
    39  		t.Fatalf("expected non-zero, got %q", v)
    40  	}
    41  }
    42  
    43  // TestMetricDbSizeDefrag checks that the db size metric is set after defrag.
    44  func TestMetricDbSizeDefrag(t *testing.T) {
    45  	defer testutil.AfterTest(t)
    46  	clus := NewClusterV3(t, &ClusterConfig{Size: 1})
    47  	defer clus.Terminate(t)
    48  
    49  	kvc := toGRPC(clus.Client(0)).KV
    50  	mc := toGRPC(clus.Client(0)).Maintenance
    51  
    52  	// expand the db size
    53  	numPuts := 25 // large enough to write more than 1 page
    54  	putreq := &pb.PutRequest{Key: []byte("k"), Value: make([]byte, 4096)}
    55  	for i := 0; i < numPuts; i++ {
    56  		if _, err := kvc.Put(context.TODO(), putreq); err != nil {
    57  			t.Fatal(err)
    58  		}
    59  	}
    60  
    61  	// wait for backend txn sync
    62  	time.Sleep(500 * time.Millisecond)
    63  
    64  	beforeDefrag, err := clus.Members[0].Metric("etcd_debugging_mvcc_db_total_size_in_bytes")
    65  	if err != nil {
    66  		t.Fatal(err)
    67  	}
    68  	bv, err := strconv.Atoi(beforeDefrag)
    69  	if err != nil {
    70  		t.Fatal(err)
    71  	}
    72  	if expected := numPuts * len(putreq.Value); bv < expected {
    73  		t.Fatalf("expected db size greater than %d, got %d", expected, bv)
    74  	}
    75  
    76  	// clear out historical keys
    77  	creq := &pb.CompactionRequest{Revision: int64(numPuts), Physical: true}
    78  	if _, err := kvc.Compact(context.TODO(), creq); err != nil {
    79  		t.Fatal(err)
    80  	}
    81  
    82  	// defrag should give freed space back to fs
    83  	mc.Defragment(context.TODO(), &pb.DefragmentRequest{})
    84  	afterDefrag, err := clus.Members[0].Metric("etcd_debugging_mvcc_db_total_size_in_bytes")
    85  	if err != nil {
    86  		t.Fatal(err)
    87  	}
    88  
    89  	av, err := strconv.Atoi(afterDefrag)
    90  	if err != nil {
    91  		t.Fatal(err)
    92  	}
    93  
    94  	if bv <= av {
    95  		t.Fatalf("expected less than %d, got %d after defrag", bv, av)
    96  	}
    97  }