forked from apache/pulsar
-
Notifications
You must be signed in to change notification settings - Fork 6
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
[Broker] Make health check fail if dead locked threads are detected (a…
…pache#15155) * [Broker] Make health check fail if dead locked threads are detected * Add unit test for detecting a dead lock * Use lockInterruptibly to unlock the deadlock and wait for threads to finish * Add test for testing the deadlock detection overhead (cherry picked from commit df0c110) (cherry picked from commit 6b163f1)
- Loading branch information
Showing
4 changed files
with
279 additions
and
1 deletion.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
169 changes: 169 additions & 0 deletions
169
pulsar-common/src/main/java/org/apache/pulsar/common/util/ThreadDumpUtil.java
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,169 @@ | ||
| /** | ||
| * 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<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()}); | ||
| } | ||
|
|
||
| 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(); | ||
| } | ||
|
|
||
| } |