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
|
// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.routing;
import com.yahoo.cloud.config.LbServicesConfig;
import com.yahoo.component.AbstractComponent;
import com.yahoo.component.annotation.Inject;
import com.yahoo.concurrent.DaemonThreadFactory;
import com.yahoo.config.ConfigInstance;
import com.yahoo.config.subscription.ConfigHandle;
import com.yahoo.config.subscription.ConfigSource;
import com.yahoo.config.subscription.ConfigSourceSet;
import com.yahoo.config.subscription.ConfigSubscriber;
import com.yahoo.jdisc.Metric;
import com.yahoo.routing.config.ZoneConfig;
import com.yahoo.system.ProcessExecuter;
import com.yahoo.vespa.hosted.routing.nginx.Nginx;
import com.yahoo.vespa.hosted.routing.status.RoutingStatus;
import com.yahoo.yolean.Exceptions;
import com.yahoo.yolean.concurrent.Sleeper;
import java.nio.file.FileSystems;
import java.time.Clock;
import java.time.Duration;
import java.time.Instant;
import java.util.Objects;
import java.util.Optional;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.BiConsumer;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* The routing generator generates a routing table for a hosted Vespa zone.
*
* Config is retrieved by subscribing to {@link LbServicesConfig} for all deployments. This is then translated to a
* {@link RoutingTable}, which is loaded into a {@link Router}.
*
* @author oyving
* @author mpolden
*/
public class RoutingGenerator extends AbstractComponent {
private static final Logger log = Logger.getLogger(RoutingGenerator.class.getName());
private static final Duration configTimeout = Duration.ofSeconds(10);
private static final Duration shutdownTimeout = Duration.ofSeconds(10);
private static final Duration refreshInterval = Duration.ofSeconds(30);
private final Router router;
private final Clock clock;
private final ConfigSubscriber configSubscriber;
private final ExecutorService executor = Executors.newSingleThreadExecutor(new DaemonThreadFactory("routing-generator-config-subscriber"));
private final ScheduledExecutorService scheduledExecutor = new ScheduledThreadPoolExecutor(1, new DaemonThreadFactory("routing-generator-maintenance"));
private final Object monitor = new Object();
private volatile RoutingTable routingTable = null;
@Inject
public RoutingGenerator(ZoneConfig zoneConfig, RoutingStatus routingStatus, Metric metric) {
this(new ConfigSourceSet(zoneConfig.configserver()), new Nginx(FileSystems.getDefault(),
new ProcessExecuter(),
Sleeper.DEFAULT,
Clock.systemUTC(),
routingStatus,
metric),
Clock.systemUTC());
}
RoutingGenerator(ConfigSource configSource, Router router, Clock clock) {
this.router = Objects.requireNonNull(router);
this.clock = Objects.requireNonNull(clock);
this.configSubscriber = new ConfigSubscriber(configSource);
executor.execute(() -> subscribeOn(LbServicesConfig.class, this::load, configSource, executor));
// Reload configuration periodically. The router depend on state from other sources than config, such as RoutingStatus
scheduledExecutor.scheduleAtFixedRate(this::reload, refreshInterval.toMillis(), refreshInterval.toMillis(), TimeUnit.MILLISECONDS);
}
/** Get the currently active routing table, if any */
public Optional<RoutingTable> routingTable() {
return Optional.ofNullable(routingTable);
}
/** Reload the current routing table, if any */
private void reload() {
synchronized (monitor) {
routingTable().ifPresent(this::load);
}
}
/** Load the given routing table */
private void load(RoutingTable newTable) {
synchronized (monitor) {
router.load(newTable);
routingTable = newTable;
}
}
private void load(LbServicesConfig lbServicesConfig, long generation) {
load(RoutingTable.from(lbServicesConfig, generation));
}
private <T extends ConfigInstance> void subscribeOn(Class<T> clazz, BiConsumer<T, Long> action, ConfigSource configSource,
ExecutorService executor) {
ConfigHandle<T> configHandle = null;
String configId = "*";
while (!executor.isShutdown()) {
try {
boolean initializing = true;
log.log(Level.INFO, "Subscribing to configuration " + clazz + "@" + configId + " from " + configSource);
if (configHandle == null) {
configHandle = configSubscriber.subscribe(clazz, configId);
}
while (!executor.isShutdown() && !configSubscriber.isClosed()) {
Instant subscribingAt = clock.instant();
if (configSubscriber.nextGeneration(configTimeout.toMillis(), initializing) && configHandle.isChanged()) {
log.log(Level.INFO, "Received new configuration: " + configHandle);
T configuration = configHandle.getConfig();
log.log(Level.FINE, "Received new configuration: " + configuration);
action.accept(configuration, configSubscriber.getGeneration());
initializing = false;
} else {
log.log(Level.FINE, "Configuration tick with no change: " + configHandle +
", getting config took " + Duration.between(subscribingAt, clock.instant()) +
", timeout is " + configTimeout);
}
}
} catch (Exception e) {
log.log(Level.WARNING, "Exception while subscribing to configuration: " + clazz + "@" + configId +
" from " + configSource + ": " + Exceptions.toMessageString(e));
}
}
}
@Override
public void deconstruct() {
configSubscriber.close();
// shutdownNow because ConfigSubscriber#nextGeneration blocks until next config, and we don't want to wait for
// that when shutting down
executor.shutdownNow();
scheduledExecutor.shutdown();
awaitTermination("executor", executor);
awaitTermination("scheduledExecutor", scheduledExecutor);
}
private static void awaitTermination(String name, ExecutorService executorService) {
try {
if (!executorService.awaitTermination(shutdownTimeout.toMillis(), TimeUnit.MILLISECONDS)) {
throw new RuntimeException("Failed to shut down " + name + " within " + shutdownTimeout);
}
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
}
|
