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
|
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you 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 org.elasticsearch.common.util.concurrent;
import org.elasticsearch.common.settings.Settings;
import java.util.Arrays;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedTransferQueue;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;
/**
*
*/
public class EsExecutors {
/**
* Settings key to manually set the number of available processors.
* This is used to adjust thread pools sizes etc. per node.
*/
public static final String PROCESSORS = "processors";
/** Useful for testing */
public static final String DEFAULT_SYSPROP = "es.processors.override";
/**
* Returns the number of processors available but at most <tt>32</tt>.
*/
public static int boundedNumberOfProcessors(Settings settings) {
/* This relates to issues where machines with large number of cores
* ie. >= 48 create too many threads and run into OOM see #3478
* We just use an 32 core upper-bound here to not stress the system
* too much with too many created threads */
int defaultValue = Math.min(32, Runtime.getRuntime().availableProcessors());
try {
defaultValue = Integer.parseInt(System.getProperty(DEFAULT_SYSPROP));
} catch (Throwable ignored) {}
return settings.getAsInt(PROCESSORS, defaultValue);
}
public static PrioritizedEsThreadPoolExecutor newSinglePrioritizing(String name, ThreadFactory threadFactory) {
return new PrioritizedEsThreadPoolExecutor(name, 1, 1, 0L, TimeUnit.MILLISECONDS, threadFactory);
}
public static EsThreadPoolExecutor newScaling(String name, int min, int max, long keepAliveTime, TimeUnit unit, ThreadFactory threadFactory) {
ExecutorScalingQueue<Runnable> queue = new ExecutorScalingQueue<>();
// we force the execution, since we might run into concurrency issues in offer for ScalingBlockingQueue
EsThreadPoolExecutor executor = new EsThreadPoolExecutor(name, min, max, keepAliveTime, unit, queue, threadFactory, new ForceQueuePolicy());
queue.executor = executor;
return executor;
}
public static EsThreadPoolExecutor newCached(String name, long keepAliveTime, TimeUnit unit, ThreadFactory threadFactory) {
return new EsThreadPoolExecutor(name, 0, Integer.MAX_VALUE, keepAliveTime, unit, new SynchronousQueue<Runnable>(), threadFactory, new EsAbortPolicy());
}
public static EsThreadPoolExecutor newFixed(String name, int size, int queueCapacity, ThreadFactory threadFactory) {
BlockingQueue<Runnable> queue;
if (queueCapacity < 0) {
queue = ConcurrentCollections.newBlockingQueue();
} else {
queue = new SizeBlockingQueue<>(ConcurrentCollections.<Runnable>newBlockingQueue(), queueCapacity);
}
return new EsThreadPoolExecutor(name, size, size, 0, TimeUnit.MILLISECONDS, queue, threadFactory, new EsAbortPolicy());
}
public static String threadName(Settings settings, String ... names) {
String namePrefix =
Arrays
.stream(names)
.filter(name -> name != null)
.collect(Collectors.joining(".", "[", "]"));
return threadName(settings, namePrefix);
}
public static String threadName(Settings settings, String namePrefix) {
String name = settings.get("name");
if (name == null) {
name = "elasticsearch";
} else {
name = "elasticsearch[" + name + "]";
}
return name + "[" + namePrefix + "]";
}
public static ThreadFactory daemonThreadFactory(Settings settings, String namePrefix) {
return daemonThreadFactory(threadName(settings, namePrefix));
}
public static ThreadFactory daemonThreadFactory(Settings settings, String ... names) {
return daemonThreadFactory(threadName(settings, names));
}
public static ThreadFactory daemonThreadFactory(String namePrefix) {
return new EsThreadFactory(namePrefix);
}
static class EsThreadFactory implements ThreadFactory {
final ThreadGroup group;
final AtomicInteger threadNumber = new AtomicInteger(1);
final String namePrefix;
public EsThreadFactory(String namePrefix) {
this.namePrefix = namePrefix;
SecurityManager s = System.getSecurityManager();
group = (s != null) ? s.getThreadGroup() :
Thread.currentThread().getThreadGroup();
}
@Override
public Thread newThread(Runnable r) {
Thread t = new Thread(group, r,
namePrefix + "[T#" + threadNumber.getAndIncrement() + "]",
0);
t.setDaemon(true);
return t;
}
}
/**
* Cannot instantiate.
*/
private EsExecutors() {
}
static class ExecutorScalingQueue<E> extends LinkedTransferQueue<E> {
ThreadPoolExecutor executor;
public ExecutorScalingQueue() {
}
@Override
public boolean offer(E e) {
if (!tryTransfer(e)) {
int left = executor.getMaximumPoolSize() - executor.getCorePoolSize();
if (left > 0) {
return false;
} else {
return super.offer(e);
}
} else {
return true;
}
}
}
/**
* A handler for rejected tasks that adds the specified element to this queue,
* waiting if necessary for space to become available.
*/
static class ForceQueuePolicy implements XRejectedExecutionHandler {
@Override
public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
try {
executor.getQueue().put(r);
} catch (InterruptedException e) {
//should never happen since we never wait
throw new EsRejectedExecutionException(e);
}
}
@Override
public long rejected() {
return 0;
}
}
}
|
