org.apache.pulsar.common.util.ThreadDumpUtil Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.apache.pulsar.common.util;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.lang.management.LockInfo;
import java.lang.management.ManagementFactory;
import java.lang.management.MonitorInfo;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Map;
import javax.management.JMException;
import javax.management.ObjectName;
/**
* Adapted from Hadoop TimedOutTestsListener.
*
* https://raw.githubusercontent.com/apache/hadoop/master/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/test/TimedOutTestsListener.java
*/
public class ThreadDumpUtil {
private static final String INDENT = " ";
public static String buildThreadDiagnosticString() {
StringWriter sw = new StringWriter();
PrintWriter output = new PrintWriter(sw);
output.println(buildThreadDump());
String deadlocksInfo = buildDeadlockInfo();
if (deadlocksInfo != null) {
output.println("====> DEADLOCKS DETECTED <====");
output.println();
output.println(deadlocksInfo);
}
return sw.toString();
}
static String buildThreadDump() {
try {
// first attempt to use jcmd to do the thread dump, similar output to jstack
return callDiagnosticCommand("threadPrint", "-l");
} catch (Exception ignore) {
}
// fallback to using JMX for creating the thread dump
StringBuilder dump = new StringBuilder();
dump.append(String.format("Timestamp: %s", DateTimeFormatter.ISO_OFFSET_DATE_TIME.format(LocalDateTime.now())));
dump.append("\n\n");
Map stackTraces = Thread.getAllStackTraces();
for (Map.Entry e : stackTraces.entrySet()) {
Thread thread = e.getKey();
dump.append('\n');
dump.append(String.format("\"%s\" %s prio=%d tid=%d %s%njava.lang.Thread.State: %s", thread.getName(),
(thread.isDaemon() ? "daemon" : ""), thread.getPriority(), thread.getId(),
Thread.State.WAITING.equals(thread.getState()) ? "in Object.wait()" : thread.getState().name(),
Thread.State.WAITING.equals(thread.getState()) ? "WAITING (on object monitor)"
: thread.getState()));
for (StackTraceElement stackTraceElement : e.getValue()) {
dump.append("\n at ");
dump.append(stackTraceElement);
}
dump.append("\n");
}
return dump.toString();
}
/**
* Calls a diagnostic commands.
* The available operations are similar to what the jcmd commandline tool has,
* however the naming of the operations are different. The "help" operation can be used
* to find out the available operations. For example, the jcmd command "Thread.print" maps
* to "threadPrint" operation name.
*/
static String callDiagnosticCommand(String operationName, String... args)
throws JMException {
return (String) ManagementFactory.getPlatformMBeanServer()
.invoke(new ObjectName("com.sun.management:type=DiagnosticCommand"),
operationName, new Object[]{args}, new String[]{String[].class.getName()});
}
static String buildDeadlockInfo() {
ThreadMXBean threadBean = ManagementFactory.getThreadMXBean();
long[] threadIds = threadBean.findDeadlockedThreads();
if (threadIds != null && threadIds.length > 0) {
StringWriter stringWriter = new StringWriter();
PrintWriter out = new PrintWriter(stringWriter);
ThreadInfo[] infos = threadBean.getThreadInfo(threadIds, true, true);
for (ThreadInfo ti : infos) {
printThreadInfo(ti, out);
printLockInfo(ti.getLockedSynchronizers(), out);
out.println();
}
out.close();
return stringWriter.toString();
} else {
return null;
}
}
private static void printThreadInfo(ThreadInfo ti, PrintWriter out) {
// print thread information
printThread(ti, out);
// print stack trace with locks
StackTraceElement[] stacktrace = ti.getStackTrace();
MonitorInfo[] monitors = ti.getLockedMonitors();
for (int i = 0; i < stacktrace.length; i++) {
StackTraceElement ste = stacktrace[i];
out.println(INDENT + "at " + ste.toString());
for (MonitorInfo mi : monitors) {
if (mi.getLockedStackDepth() == i) {
out.println(INDENT + " - locked " + mi);
}
}
}
out.println();
}
private static void printThread(ThreadInfo ti, PrintWriter out) {
out.println();
out.print("\"" + ti.getThreadName() + "\"" + " Id=" + ti.getThreadId() + " in " + ti.getThreadState());
if (ti.getLockName() != null) {
out.print(" on lock=" + ti.getLockName());
}
if (ti.isSuspended()) {
out.print(" (suspended)");
}
if (ti.isInNative()) {
out.print(" (running in native)");
}
out.println();
if (ti.getLockOwnerName() != null) {
out.println(INDENT + " owned by " + ti.getLockOwnerName() + " Id=" + ti.getLockOwnerId());
}
}
private static void printLockInfo(LockInfo[] locks, PrintWriter out) {
out.println(INDENT + "Locked synchronizers: count = " + locks.length);
for (LockInfo li : locks) {
out.println(INDENT + " - " + li);
}
out.println();
}
}