-
Notifications
You must be signed in to change notification settings - Fork 2.3k
/
RaftReplicatorTest.java
286 lines (240 loc) · 10.2 KB
/
RaftReplicatorTest.java
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
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
/*
* Copyright (c) 2002-2016 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.causalclustering.core.replication;
import org.hamcrest.Matchers;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import java.util.UUID;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import org.neo4j.causalclustering.core.consensus.LeaderLocator;
import org.neo4j.causalclustering.core.consensus.NoLeaderFoundException;
import org.neo4j.causalclustering.core.consensus.RaftMessages;
import org.neo4j.causalclustering.core.consensus.ReplicatedInteger;
import org.neo4j.causalclustering.core.replication.session.GlobalSession;
import org.neo4j.causalclustering.core.replication.session.LocalSessionPool;
import org.neo4j.causalclustering.core.state.Result;
import org.neo4j.causalclustering.core.state.machines.tx.ConstantTimeRetryStrategy;
import org.neo4j.causalclustering.core.state.machines.tx.RetryStrategy;
import org.neo4j.causalclustering.identity.MemberId;
import org.neo4j.causalclustering.messaging.Message;
import org.neo4j.causalclustering.messaging.Outbound;
import org.neo4j.graphdb.DatabaseShutdownException;
import org.neo4j.kernel.AvailabilityGuard;
import org.neo4j.logging.NullLog;
import org.neo4j.time.Clocks;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static java.util.concurrent.TimeUnit.SECONDS;
import static junit.framework.TestCase.assertEquals;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.CoreMatchers.not;
import static org.hamcrest.Matchers.greaterThan;
import static org.junit.Assert.assertThat;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
import static org.neo4j.test.assertion.Assert.assertEventually;
public class RaftReplicatorTest
{
@Rule
public ExpectedException expectedException = ExpectedException.none();
private static final int DEFAULT_TIMEOUT_MS = 15_000;
private LeaderLocator leaderLocator = mock( LeaderLocator.class );
private MemberId myself = new MemberId( UUID.randomUUID() );
private MemberId leader = new MemberId( UUID.randomUUID() );
private GlobalSession session = new GlobalSession( UUID.randomUUID(), myself );
private LocalSessionPool sessionPool = new LocalSessionPool( session );
private RetryStrategy retryStrategy = new ConstantTimeRetryStrategy( 1, SECONDS );
private AvailabilityGuard availabilityGuard = new AvailabilityGuard( Clocks.systemClock(), NullLog.getInstance() );
@Test
public void shouldSendReplicatedContentToLeader() throws Exception
{
// given
when( leaderLocator.getLeader() ).thenReturn( leader );
CapturingProgressTracker capturedProgress = new CapturingProgressTracker();
CapturingOutbound<RaftMessages.RaftMessage> outbound = new CapturingOutbound<>();
RaftReplicator replicator =
new RaftReplicator( leaderLocator, myself, outbound, sessionPool,
capturedProgress, retryStrategy, availabilityGuard );
ReplicatedInteger content = ReplicatedInteger.valueOf( 5 );
Thread replicatingThread = replicatingThread( replicator, content, false );
// when
replicatingThread.start();
// then
assertEventually( "making progress", () -> capturedProgress.last, not( equalTo( null ) ), DEFAULT_TIMEOUT_MS, MILLISECONDS );
// when
capturedProgress.last.setReplicated();
// then
replicatingThread.join( DEFAULT_TIMEOUT_MS );
assertEquals( leader, outbound.lastTo );
}
@Test
public void shouldResendAfterTimeout() throws Exception
{
// given
when( leaderLocator.getLeader() ).thenReturn( leader );
CapturingProgressTracker capturedProgress = new CapturingProgressTracker();
CapturingOutbound outbound = new CapturingOutbound();
ConstantTimeRetryStrategy retryStrategy = new ConstantTimeRetryStrategy( 100, MILLISECONDS );
RaftReplicator replicator = new RaftReplicator( leaderLocator, myself, outbound,
sessionPool, capturedProgress, retryStrategy, availabilityGuard );
ReplicatedInteger content = ReplicatedInteger.valueOf( 5 );
Thread replicatingThread = replicatingThread( replicator, content, false );
// when
replicatingThread.start();
// then
assertEventually( "send count", () -> outbound.count, greaterThan( 2 ), DEFAULT_TIMEOUT_MS, MILLISECONDS );
// cleanup
capturedProgress.last.setReplicated();
replicatingThread.join( DEFAULT_TIMEOUT_MS );
}
@Test
public void shouldReleaseSessionWhenFinished() throws Exception
{
// given
when( leaderLocator.getLeader() ).thenReturn( leader );
CapturingProgressTracker capturedProgress = new CapturingProgressTracker();
CapturingOutbound outbound = new CapturingOutbound();
RaftReplicator replicator = new RaftReplicator( leaderLocator, myself, outbound,
sessionPool, capturedProgress, retryStrategy, availabilityGuard );
ReplicatedInteger content = ReplicatedInteger.valueOf( 5 );
Thread replicatingThread = replicatingThread( replicator, content, true );
// when
replicatingThread.start();
// then
assertEventually( "making progress", () -> capturedProgress.last, not( equalTo( null ) ),
DEFAULT_TIMEOUT_MS, MILLISECONDS );
assertEquals( 1, sessionPool.openSessionCount() );
// when
capturedProgress.last.setReplicated();
capturedProgress.last.futureResult().complete( 5 );
replicatingThread.join( DEFAULT_TIMEOUT_MS );
// then
assertEquals( 0, sessionPool.openSessionCount() );
}
@Test
public void stopReplicationOnShutdown() throws NoLeaderFoundException, InterruptedException
{
when( leaderLocator.getLeader() ).thenReturn( leader );
CapturingProgressTracker capturedProgress = new CapturingProgressTracker();
CapturingOutbound outbound = new CapturingOutbound();
RaftReplicator replicator =
new RaftReplicator( leaderLocator, myself, outbound, sessionPool, capturedProgress, retryStrategy,
availabilityGuard );
ReplicatedInteger content = ReplicatedInteger.valueOf( 5 );
ReplicatingThread replicatingThread = replicatingThread( replicator, content, true );
// when
replicatingThread.start();
availabilityGuard.shutdown();
replicatingThread.join();
assertThat( replicatingThread.getReplicationException(), Matchers.instanceOf( DatabaseShutdownException.class ) );
}
private ReplicatingThread replicatingThread( RaftReplicator replicator, ReplicatedInteger content, boolean trackResult )
{
return new ReplicatingThread( replicator, content, trackResult );
}
private class ReplicatingThread extends Thread
{
private final RaftReplicator replicator;
private final ReplicatedInteger content;
private final boolean trackResult;
private volatile Exception replicationException;
ReplicatingThread( RaftReplicator replicator, ReplicatedInteger content, boolean trackResult )
{
this.replicator = replicator;
this.content = content;
this.trackResult = trackResult;
}
@Override
public void run()
{
try
{
Future<Object> futureResult = replicator.replicate( content, trackResult );
if ( trackResult )
{
try
{
futureResult.get();
}
catch ( ExecutionException e )
{
replicationException = e;
throw new IllegalStateException();
}
}
}
catch ( Exception e )
{
replicationException = e;
}
}
public Exception getReplicationException()
{
return replicationException;
}
}
private class CapturingProgressTracker implements ProgressTracker
{
private Progress last;
@Override
public Progress start( DistributedOperation operation )
{
last = new Progress();
return last;
}
@Override
public void trackReplication( DistributedOperation operation )
{
throw new UnsupportedOperationException();
}
@Override
public void trackResult( DistributedOperation operation, Result result )
{
throw new UnsupportedOperationException();
}
@Override
public void abort( DistributedOperation operation )
{
throw new UnsupportedOperationException();
}
@Override
public void triggerReplicationEvent()
{
throw new UnsupportedOperationException();
}
@Override
public int inProgressCount()
{
throw new UnsupportedOperationException();
}
}
private class CapturingOutbound<MESSAGE extends Message> implements Outbound<MemberId, MESSAGE>
{
private MemberId lastTo;
private int count;
@Override
public void send( MemberId to, MESSAGE message )
{
this.lastTo = to;
this.count++;
}
}
}