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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing
/*
* 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.geode.internal.util;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.io.StringWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.zip.GZIPInputStream;
/**
* PluckStacks is a replacement for the old pluckstacks.pl Perl script that we've used for years.
* When run as a program it takes a list of files that may contain thread dumps. It scans those
* files, pulls out the thread dumps, removes any well-known idle threads and prints the rest to
* stdout.
*
*
*
*/
public class PluckStacks {
static boolean DEBUG = Boolean.getBoolean("PluckStacks.DEBUG");
// only print one stack dump from each file
static final boolean ONE_STACK = Boolean.getBoolean("oneDump");
/**
* @param args names of files to scan for suspicious threads in thread-dumps
*/
public static void main(String[] args) {
PluckStacks ps = new PluckStacks();
for (int i = 0; i < args.length; i++) {
ps.examineLog(new File(args[i]));
}
}
private void examineLog(File log) {
LineNumberReader reader = null;
try {
if (log.getName().endsWith(".gz")) {
reader = new LineNumberReader(
new InputStreamReader(new GZIPInputStream(new FileInputStream(log))));
} else {
reader = new LineNumberReader(new FileReader(log));
}
} catch (FileNotFoundException e) {
return;
} catch (IOException e) {
return;
}
StringBuffer buffer = new StringBuffer();
String line = null;
int stackNumber = 1;
try {
while ((line = reader.readLine()) != null) {
if (line.startsWith("Full thread dump")) {
int lineNumber = reader.getLineNumber();
List stacks = getStacks(reader);
if (stacks.size() > 0) {
buffer.append("[Stack #").append(stackNumber++)
.append(" from " + log + " line " + lineNumber + "]\n").append(line).append("\n");
for (ThreadStack stack : stacks) {
stack.appendToBuffer(buffer);
buffer.append("\n");
}
buffer.append("\n\n");
}
if (ONE_STACK) {
break;
}
}
}
} catch (IOException ioe) {
return;
} finally {
if (reader != null)
try {
reader.close();
} catch (IOException ignore) {
}
}
String output = buffer.toString();
if (output.length() > 0) {
System.out.println(output);
}
}
/** parses each stack trace and returns any that are unexpected */
public List getStacks(BufferedReader reader) throws IOException {
List result = new LinkedList();
ThreadStack lastStack = null;
ArrayList breadcrumbs = new ArrayList(4);
do {
String line = null;
// find the start of the stack
while ((line = reader.readLine()) != null) {
if (line.length() > 0 && line.charAt(0) == '"')
break;
if (lastStack != null) {
if (line.length() == 0 || line.charAt(0) == '\t') {
lastStack.add(line);
}
}
}
// cache the first two lines and examine the third to see if it starts with a tab and "at "
String firstLine = line;
String secondLine = null;
breadcrumbs.clear();
do {
line = reader.readLine();
if (line == null) {
Collections.sort(result);
return result;
}
if (line.startsWith("\t/")) {
breadcrumbs.add(line);
continue;
} else {
break;
}
} while (true);
secondLine = line;
line = reader.readLine();
if (line == null) {
Collections.sort(result);
return result;
}
if (!line.startsWith("\tat ")) {
Collections.sort(result);
return result;
}
lastStack = new ThreadStack(firstLine, secondLine, line, reader);
lastStack.addBreadcrumbs(breadcrumbs);
if (DEBUG) {
if (breadcrumbs.size() > 0) {
System.out.println(
"added " + breadcrumbs.size() + " breadcrumbs to " + lastStack.getThreadName());
}
System.out.println("examining thread " + lastStack.getThreadName());
}
if (!isExpectedStack(lastStack)) {
result.add(lastStack);
}
} while (true);
}
/* see if this thread is at an expected pause point */
boolean isExpectedStack(ThreadStack thread) {
String threadName = thread.getThreadName();
int stackSize = thread.size();
// keep all hydra threads
if (threadName.startsWith("vm_"))
return false;
// these are never interesting to me
if (threadName.startsWith("StatDispatcher"))
return true;
if (threadName.startsWith("State Logger Consumer Thread"))
return true;
if (threadName.contains("StatSampler"))
return true;
if (threadName.startsWith("IDLE p2pDestreamer"))
return true;
if (threadName.startsWith("Idle OplogCompactor"))
return true;
////////////// HIGH FREQUENCY STACKS //////////////////////
// check these first for efficiency
if (threadName.startsWith("Cache Client Updater Thread")) {
return stackSize == 13 && thread.get(2).contains("SocketInputStream.socketRead0");
}
if (threadName.startsWith("Client Message Dispatcher")) {
return stackSize == 13 && thread.get(1).contains("TIMED_WAITING");
}
if (threadName.startsWith("Function Execution Processor")) {
return isIdleExecutor(thread);
}
if (threadName.startsWith("Geode Failure Detection Server")) {
return stackSize < 11 && thread.getFirstFrame().contains("socketAccept");
}
if (threadName.startsWith("Geode Membership Timer")) {
// System.out.println("gf timer stack size = " + stackSize + "; frame = " + thread.get(1));
return stackSize < 9 && !thread.isRunnable();
}
if (threadName.startsWith("Geode Membership View Creator")) {
// System.out.println("gf view creator stack size = " + stackSize + "; frame = " +
// thread.get(1));
return stackSize < 8 && !thread.isRunnable();
}
if (threadName.startsWith("Geode Heartbeat Sender")) {
return stackSize <= 8 && !thread.isRunnable();
}
// thread currently disabled
// if (threadName.startsWith("Geode Suspect Message Collector")) {
// return stackSize <= 7 && thread.get(1).contains("Thread.State: WAITING");
// }
if (threadName.startsWith("multicast receiver")) {
return (stackSize > 2 && thread.get(2).contains("PlainDatagramSocketImpl.receive"));
}
if (threadName.startsWith("P2P Listener")) {
// System.out.println("p2p listener stack size = " + stackSize + "; frame = " +
// thread.get(2));
return (stackSize == 8 && thread.get(2).contains("SocketChannelImpl.accept"));
}
if (threadName.startsWith("P2P message reader")) {
return (stackSize <= 14 && (thread.getFirstFrame().contains("FileDispatcherImpl.read")
|| thread.getFirstFrame().contains("FileDispatcher.read")
|| thread.getFirstFrame().contains("SocketDispatcher.read")));
}
if (threadName.startsWith("PartitionedRegion Message Processor")) {
return isIdleExecutor(thread);
}
if (threadName.startsWith("Pooled Message Processor")) {
return isIdleExecutor(thread);
}
if (threadName.startsWith("Pooled High Priority Message Processor")) {
return isIdleExecutor(thread) || thread.get(4).contains("OSProcess.zipStacks");
}
if (threadName.startsWith("Pooled Serial Message Processor")) {
return isIdleExecutor(thread);
}
if (threadName.startsWith("Pooled Waiting Message Processor")) {
return isIdleExecutor(thread);
}
if (threadName.startsWith("ServerConnection")) {
if (thread.getFirstFrame().contains("socketRead")
&& (stackSize > 6 && thread.get(6).contains("fetchHeader")))
return true; // reading from a client
return isIdleExecutor(thread);
}
if (threadName.startsWith("TCP Check ServerSocket Thread")) {
return (stackSize >= 3 && thread.get(2).contains("socketAccept"));
}
if (threadName.startsWith("Timer runner")) {
// System.out.println("timer runner stack size = " + stackSize + "; frame = " +
// thread.get(1));
return (stackSize <= 10 && thread.get(1).contains("TIMED_WAITING"));
}
if (threadName.startsWith("TransferQueueBundler")) {
// System.out.println("transfer bundler stack size = " + stackSize + "; frame = " +
// thread.get(2));
return (stackSize == 9 && thread.get(2).contains("sun.misc.Unsafe.park"));
}
if (threadName.startsWith("unicast receiver")) {
// System.out.println("unicast receiver stack size = " + stackSize + "; frame = " +
// thread.get(3));
return (stackSize > 2 && thread.get(2).contains("PlainDatagramSocketImpl.receive"));
}
/////////////////////////////////////////////////////////////////////////
// Now check the rest of the product threads in alphabetical order
if (threadName.startsWith("Asynchronous disk writer")) {
return !thread.isRunnable() && stackSize <= 10
&& (stackSize >= 7 && (thread.get(5).contains("waitUntilFlushIsReady")
|| thread.get(6).contains("waitUntilFlushIsReady")));
}
if (threadName.startsWith("BridgeServer-LoadPollingThread")) {
return !thread.isRunnable() && stackSize == 5;
}
if (threadName.startsWith("Cache Server Acceptor")) {
return (thread.getFirstFrame().contains("socketAccept"));
}
if (threadName.startsWith("Client Message Dispatcher")) {
return (stackSize == 11 && thread.getFirstFrame().contains("socketWrite"))
|| (stackSize == 14 && thread.getFirstFrame().contains("Unsafe.park"));
}
if (threadName.equals("ClientHealthMonitor Thread")) {
return !thread.isRunnable() && stackSize == 4;
}
if (threadName.startsWith("Distribution Locator on")) {
return stackSize <= 9 && thread.getFirstFrame().contains("socketAccept");
}
if (threadName.startsWith("DM-MemberEventInvoker")) {
return !thread.isRunnable() && (stackSize == 9 && thread.get(6).contains("Queue.take"));
}
if (threadName.startsWith("Event Processor for GatewaySender")) {
return !thread.isRunnable()
&& thread.get(3).contains("ConcurrentParallelGatewaySenderQueue.peek");
}
if (threadName.startsWith("GC Daemon")) {
return !thread.isRunnable() && stackSize <= 6;
}
if (threadName.startsWith("Replicate/Partition Region Garbage Collector")) {
return !thread.isRunnable() && (stackSize <= 7);
}
if (threadName.startsWith("Non-replicate Region Garbage Collector")) {
return !thread.isRunnable() && (stackSize <= 7);
}
if (threadName.equals("GemFire Time Service")) {
return !thread.isRunnable();
}
if (threadName.startsWith("GlobalTXTimeoutMonitor")) {
return !thread.isRunnable()
&& (stackSize <= 8 && thread.getFirstFrame().contains("Object.wait"));
}
if (threadName.startsWith("JoinProcessor")) {
return !thread.isRunnable() && stackSize <= 7;
}
if (threadName.startsWith("locator request thread")) {
return isIdleExecutor(thread);
}
if (threadName.startsWith("Lock Grantor for")) {
return !thread.isRunnable() && stackSize <= 8;
}
if (threadName.startsWith("Management Task")) {
return isIdleExecutor(thread);
}
if (threadName.startsWith("osprocess reaper")) {
return (stackSize == 5);
}
if (threadName.startsWith("P2P-Handshaker")) {
return isIdleExecutor(thread);
}
if (threadName.startsWith("P2P Listener")) {
return (stackSize == 7 && thread.getFirstFrame().contains("accept0"));
}
if (threadName.startsWith("Queue Removal Thread")) {
return !thread.isRunnable()
&& (stackSize == 5 && thread.getFirstFrame().contains("Object.wait"));
}
if (threadName.startsWith("ResourceManagerRecoveryThread")) {
return isIdleExecutor(thread);
}
if (threadName.startsWith("RMI TCP Connection(idle)")) {
return true;
}
if (threadName.startsWith("RMI Reaper")) {
return true;
}
if (threadName.startsWith("RMI RenewClean")) {
return true;
}
if (threadName.startsWith("RMI Scheduler")) {
return isIdleExecutor(thread);
}
if (threadName.startsWith("RMI TCP Accept")) {
return true;
}
if (threadName.startsWith("RMI TCP Connection")) {
return thread.getFirstFrame().contains("socketRead0");
}
if (threadName.startsWith("SnapshotResultDispatcher")) {
return !thread.isRunnable() && stackSize <= 8;
}
if (threadName.startsWith("StatMonitorNotifier Thread")) {
return (stackSize > 8 && thread.get(7).contains("SynchronousQueue.take"));
}
if (threadName.startsWith("SystemFailure Proctor")) {
return !thread.isRunnable()
&& (stackSize == 6 && thread.getFirstFrame().contains("Thread.sleep"));
}
if (threadName.startsWith("SystemFailure WatchDog")) {
return (stackSize <= 8 && thread.getFirstFrame().contains("Object.wait"));
}
if (threadName.startsWith("ThresholdEventProcessor")) {
return isIdleExecutor(thread);
}
if (threadName.startsWith("Timer-")) {
if (thread.isRunnable())
return true;
if ((stackSize <= 8) && thread.getFirstFrame().contains("Object.wait"))
return true;
}
if (threadName.startsWith("TimeScheduler.Thread")) {
return !thread.isRunnable()
&& (stackSize <= 8 && thread.getFirstFrame().contains("Object.wait"));
}
if (threadName.startsWith("vfabric-license-heartbeat")) {
if (thread.isRunnable())
return false;
if (stackSize == 6 && thread.getFirstFrame().contains("Thread.sleep"))
return true;
return (stackSize <= 7 && thread.getFirstFrame().contains("Object.wait"));
}
if (threadName.equals("WAN Locator Discovery Thread")) {
return (!thread.isRunnable() && thread.get(3).contains("exchangeRemoteLocators"));
}
return isIdleExecutor(thread);
}
boolean isIdleExecutor(ThreadStack thread) {
if (thread.isRunnable())
return false;
int size = thread.size();
if (size > 8 && thread.get(7).contains("DMStats.take"))
return true;
if (size > 3 && thread.get(size - 3).contains("getTask"))
return true; // locator request thread
if (size > 4 && thread.get(size - 4).contains("getTask"))
return true; // most executors match this
if (size > 5 && thread.get(size - 5).contains("getTask"))
return true; // View Message Processor
if (size > 6 && thread.get(size - 6).contains("getTask"))
return true; // View Message Processor
return false;
}
/** ThreadStack holds the stack for a single Java Thread */
public static class ThreadStack implements Comparable {
List lines = new ArrayList(20);
boolean runnable;
List breadcrumbs;
/** create a stack with the given initial lines, reading the rest from the Reader */
ThreadStack(String firstLine, String secondLine, String thirdLine, BufferedReader reader)
throws IOException {
lines.add(firstLine);
lines.add(secondLine);
runnable = secondLine.contains("RUNNABLE");
lines.add(thirdLine);
String line = null;
while ((line = reader.readLine()) != null && line.trim().length() > 0) {
lines.add(line);
}
}
void addBreadcrumbs(List crumbs) {
this.breadcrumbs = new ArrayList(crumbs);
}
void add(String line) {
lines.add(line);
}
String get(int position) {
return lines.get(position);
}
boolean isRunnable() {
return runnable;
}
boolean contains(String subString) {
for (int i = lines.size() - 1; i >= 0; i--) {
if (lines.get(i).contains(subString)) {
return true;
}
}
return false;
}
String getFirstFrame() {
if (lines.size() > 2) {
return lines.get(2);
} else {
return "";
}
}
String getThreadName() {
String firstLine = lines.get(0);
int quote = firstLine.indexOf('"', 1);
if (quote > 1) {
return firstLine.substring(1, quote);
}
return firstLine.substring(1, firstLine.length());
}
int size() {
return lines.size();
}
@Override
public String toString() {
StringWriter sw = new StringWriter();
boolean first = true;
for (String line : lines) {
sw.append(line).append("\n");
if (first && this.breadcrumbs != null) {
for (String bline : breadcrumbs) {
sw.append(bline).append("\n");
}
}
first = false;
}
return sw.toString();
}
public void writeTo(Writer w) throws IOException {
if (DEBUG) {
w.append("stack.name='" + getThreadName() + "' runnable=" + this.runnable + " lines="
+ lines.size());
w.append("\n");
}
boolean first = true;
for (String line : lines) {
w.append(line);
w.append("\n");
if (first) {
first = false;
if (breadcrumbs != null) {
for (String bline : breadcrumbs) {
w.append(bline).append("\n");
}
}
}
}
}
public void appendToBuffer(StringBuffer buffer) {
if (DEBUG)
buffer.append("stack.name='" + getThreadName() + "' runnable=" + this.runnable + " lines="
+ lines.size()).append("\n");
boolean first = true;
for (String line : lines) {
buffer.append(line).append("\n");
if (first && breadcrumbs != null) {
for (String bline : breadcrumbs) {
buffer.append(bline).append("\n");
}
}
first = false;
}
}
@Override
public int compareTo(Object other) {
return ((ThreadStack) other).getThreadName().compareTo(getThreadName());
}
}
}