1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
// Copyright (c) 2014 Couchbase, Inc.
//
// 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.
package test
import (
"fmt"
"reflect"
"testing"
"github.com/blevesearch/bleve/index/store"
)
// tests focused on verifying that readers are isolated from writers
func CommonTestReaderIsolation(t *testing.T, s store.KVStore) {
// insert a kv pair
writer, err := s.Writer()
if err != nil {
t.Error(err)
}
// **************************************************
// this is a hack only required for BoltDB
// however its harmless so to keep the tests
// the same everywhere, we include it here
//
// this is a hack to try to pre-emptively overflow
// boltdb writes *MAY* block a long reader
// in particular, if the write requires additional
// allocation, it must acquire the same lock as
// the reader, thus cannot continue until that
// reader is closed.
// in general this is not a problem for bleve
// (though it may affect performance in some cases)
// but it is a problem for this test which attempts
// to easily verify that readers are isolated
// this hack writes enough initial data such that
// the subsequent writes do not require additional
// space
hackSize := 1000
batch := writer.NewBatch()
for i := 0; i < hackSize; i++ {
k := fmt.Sprintf("x%d", i)
batch.Set([]byte(k), []byte("filler"))
}
err = writer.ExecuteBatch(batch)
if err != nil {
t.Fatal(err)
}
// **************************************************
batch = writer.NewBatch()
batch.Set([]byte("a"), []byte("val-a"))
err = writer.ExecuteBatch(batch)
if err != nil {
t.Fatal(err)
}
err = writer.Close()
if err != nil {
t.Fatal(err)
}
// create an isolated reader
reader, err := s.Reader()
if err != nil {
t.Error(err)
}
defer func() {
err := reader.Close()
if err != nil {
t.Fatal(err)
}
}()
// verify that we see the value already inserted
val, err := reader.Get([]byte("a"))
if err != nil {
t.Error(err)
}
if !reflect.DeepEqual(val, []byte("val-a")) {
t.Errorf("expected val-a, got nil")
}
// verify that an iterator sees it
count := 0
it := reader.RangeIterator([]byte{0}, []byte{'x'})
defer func() {
err := it.Close()
if err != nil {
t.Fatal(err)
}
}()
for it.Valid() {
it.Next()
count++
}
if count != 1 {
t.Errorf("expected iterator to see 1, saw %d", count)
}
// add something after the reader was created
writer, err = s.Writer()
if err != nil {
t.Error(err)
}
batch = writer.NewBatch()
batch.Set([]byte("b"), []byte("val-b"))
err = writer.ExecuteBatch(batch)
if err != nil {
t.Fatal(err)
}
err = writer.Close()
if err != nil {
t.Fatal(err)
}
// ensure that a newer reader sees it
newReader, err := s.Reader()
if err != nil {
t.Error(err)
}
defer func() {
err := newReader.Close()
if err != nil {
t.Fatal(err)
}
}()
val, err = newReader.Get([]byte("b"))
if err != nil {
t.Error(err)
}
if !reflect.DeepEqual(val, []byte("val-b")) {
t.Errorf("expected val-b, got nil")
}
// ensure that the direct iterator sees it
count = 0
it2 := newReader.RangeIterator([]byte{0}, []byte{'x'})
defer func() {
err := it2.Close()
if err != nil {
t.Fatal(err)
}
}()
for it2.Valid() {
it2.Next()
count++
}
if count != 2 {
t.Errorf("expected iterator to see 2, saw %d", count)
}
// but that the isolated reader does not
val, err = reader.Get([]byte("b"))
if err != nil {
t.Error(err)
}
if val != nil {
t.Errorf("expected nil, got %v", val)
}
// and ensure that the iterator on the isolated reader also does not
count = 0
it3 := reader.RangeIterator([]byte{0}, []byte{'x'})
defer func() {
err := it3.Close()
if err != nil {
t.Fatal(err)
}
}()
for it3.Valid() {
it3.Next()
count++
}
if count != 1 {
t.Errorf("expected iterator to see 1, saw %d", count)
}
}
|
