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[Metadata] Print thread dump to log when Zookeeper session expires to…
… detect possible deadlocks (apache#13124) - inspired by apache#3566 (comment)
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169
pulsar-common/src/main/java/org/apache/pulsar/common/util/ThreadDumpUtil.java
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| /** | ||
| * 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; | ||
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|
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| 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; | ||
|
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||
| /** | ||
| * 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 = " "; | ||
|
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| public static String buildThreadDiagnosticString() { | ||
| StringWriter sw = new StringWriter(); | ||
| PrintWriter output = new PrintWriter(sw); | ||
|
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| output.println(buildThreadDump()); | ||
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| String deadlocksInfo = buildDeadlockInfo(); | ||
| if (deadlocksInfo != null) { | ||
| output.println("====> DEADLOCKS DETECTED <===="); | ||
| output.println(); | ||
| output.println(deadlocksInfo); | ||
| } | ||
|
|
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| return sw.toString(); | ||
| } | ||
|
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| 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) { | ||
| } | ||
|
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| // fallback to using JMX for creating the thread dump | ||
| StringBuilder dump = new StringBuilder(); | ||
|
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| dump.append(String.format("Timestamp: %s", DateTimeFormatter.ISO_OFFSET_DATE_TIME.format(LocalDateTime.now()))); | ||
| dump.append("\n\n"); | ||
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| Map<Thread, StackTraceElement[]> stackTraces = Thread.getAllStackTraces(); | ||
| for (Map.Entry<Thread, StackTraceElement[]> 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()}); | ||
| } | ||
|
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| static String buildDeadlockInfo() { | ||
| ThreadMXBean threadBean = ManagementFactory.getThreadMXBean(); | ||
| long[] threadIds = threadBean.findMonitorDeadlockedThreads(); | ||
| if (threadIds != null && threadIds.length > 0) { | ||
| StringWriter stringWriter = new StringWriter(); | ||
| PrintWriter out = new PrintWriter(stringWriter); | ||
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| ThreadInfo[] infos = threadBean.getThreadInfo(threadIds, true, true); | ||
| for (ThreadInfo ti : infos) { | ||
| printThreadInfo(ti, out); | ||
| printLockInfo(ti.getLockedSynchronizers(), out); | ||
| out.println(); | ||
| } | ||
|
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| out.close(); | ||
| return stringWriter.toString(); | ||
| } else { | ||
| return null; | ||
| } | ||
| } | ||
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| private static void printThreadInfo(ThreadInfo ti, PrintWriter out) { | ||
| // print thread information | ||
| printThread(ti, out); | ||
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| // 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(); | ||
| } | ||
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| 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()); | ||
| } | ||
| } | ||
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| 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(); | ||
| } | ||
|
|
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| } |