vitess.io/vitess@v0.16.2/go/vt/topotools/shard_test.go (about)

     1  /*
     2  Copyright 2019 The Vitess Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package topotools
    18  
    19  import (
    20  	"fmt"
    21  	"math/rand"
    22  	"sync"
    23  	"testing"
    24  	"time"
    25  
    26  	"context"
    27  
    28  	topodatapb "vitess.io/vitess/go/vt/proto/topodata"
    29  	"vitess.io/vitess/go/vt/topo/memorytopo"
    30  )
    31  
    32  // TestCreateShard tests a few cases for topo.CreateShard
    33  func TestCreateShard(t *testing.T) {
    34  	ctx := context.Background()
    35  
    36  	// Set up topology.
    37  	ts := memorytopo.NewServer("test_cell")
    38  
    39  	keyspace := "test_keyspace"
    40  	shard := "0"
    41  
    42  	// create shard in a non-existing keyspace
    43  	if err := ts.CreateShard(ctx, keyspace, shard); err == nil {
    44  		t.Fatalf("CreateShard(invalid keyspace) didn't fail")
    45  	}
    46  
    47  	// create keyspace
    48  	if err := ts.CreateKeyspace(ctx, keyspace, &topodatapb.Keyspace{}); err != nil {
    49  		t.Fatalf("CreateKeyspace failed: %v", err)
    50  	}
    51  
    52  	// create shard should now work
    53  	if err := ts.CreateShard(ctx, keyspace, shard); err != nil {
    54  		t.Fatalf("CreateShard failed: %v", err)
    55  	}
    56  }
    57  
    58  // TestCreateShardMultiUnsharded checks ServedTypes is set
    59  // only for the first created shard.
    60  // TODO(sougou): we should eventually disallow multiple shards
    61  // for unsharded keyspaces.
    62  func TestCreateShardMultiUnsharded(t *testing.T) {
    63  	ctx := context.Background()
    64  
    65  	// Set up topology.
    66  	ts := memorytopo.NewServer("test_cell")
    67  
    68  	// create keyspace
    69  	keyspace := "test_keyspace"
    70  	if err := ts.CreateKeyspace(ctx, keyspace, &topodatapb.Keyspace{}); err != nil {
    71  		t.Fatalf("CreateKeyspace failed: %v", err)
    72  	}
    73  
    74  	// create first shard in keyspace
    75  	shard0 := "0"
    76  	if err := ts.CreateShard(ctx, keyspace, shard0); err != nil {
    77  		t.Fatalf("CreateShard(shard0) failed: %v", err)
    78  	}
    79  	if si, err := ts.GetShard(ctx, keyspace, shard0); err != nil {
    80  		t.Fatalf("GetShard(shard0) failed: %v", err)
    81  	} else {
    82  		if !si.IsPrimaryServing {
    83  			t.Fatalf("shard0 should have all 3 served types")
    84  		}
    85  	}
    86  
    87  	// create second shard in keyspace
    88  	shard1 := "1"
    89  	if err := ts.CreateShard(ctx, keyspace, shard1); err != nil {
    90  		t.Fatalf("CreateShard(shard1) failed: %v", err)
    91  	}
    92  	if si, err := ts.GetShard(ctx, keyspace, shard1); err != nil {
    93  		t.Fatalf("GetShard(shard1) failed: %v", err)
    94  	} else {
    95  		if si.IsPrimaryServing {
    96  			t.Fatalf("shard1 should have all 3 served types")
    97  		}
    98  	}
    99  }
   100  
   101  // TestGetOrCreateShard will create / get 100 shards in a keyspace
   102  // for a long time in parallel, making sure the locking and everything
   103  // works correctly.
   104  func TestGetOrCreateShard(t *testing.T) {
   105  	ctx := context.Background()
   106  
   107  	// Set up topology.
   108  	cell := "test_cell"
   109  	ts := memorytopo.NewServer(cell)
   110  
   111  	// and do massive parallel GetOrCreateShard
   112  	keyspace := "test_keyspace"
   113  	wg := sync.WaitGroup{}
   114  	rand.Seed(time.Now().UnixNano())
   115  	for i := 0; i < 100; i++ {
   116  		wg.Add(1)
   117  		go func(i int) {
   118  			defer wg.Done()
   119  
   120  			for j := 0; j < 100; j++ {
   121  				index := rand.Intn(10)
   122  				shard := fmt.Sprintf("%v", index)
   123  				si, err := ts.GetOrCreateShard(ctx, keyspace, shard)
   124  				if err != nil {
   125  					t.Errorf("GetOrCreateShard(%v, %v) failed: %v", i, shard, err)
   126  				}
   127  				if si.ShardName() != shard {
   128  					t.Errorf("si.ShardName() is wrong, got %v expected %v", si.ShardName(), shard)
   129  				}
   130  			}
   131  		}(i)
   132  	}
   133  	wg.Wait()
   134  }