shahrs87 commented on a change in pull request #3862:
URL: https://github.com/apache/hbase/pull/3862#discussion_r757671579
##########
File path: hbase-common/src/main/java/org/apache/hadoop/hbase/util/Threads.java
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@@ -197,4 +199,34 @@ public static void
setLoggingUncaughtExceptionHandler(Thread t) {
public static void printThreadInfo(PrintStream stream, String title) {
ReflectionUtils.printThreadInfo(stream, title);
}
+
+ /**
+ * Checks whether any non-daemon thread is running.
+ * @return true if there are non daemon threads running, otherwise false
+ */
+ public static boolean isNonDaemonThreadRunning() {
+ AtomicInteger nonDaemonThreadCount = new AtomicInteger();
+ Set<Thread> threads = Thread.getAllStackTraces().keySet();
+ threads.forEach(t -> {
+ // Exclude current thread
+ if (t.getId() != Thread.currentThread().getId() && !t.isDaemon()) {
+ nonDaemonThreadCount.getAndIncrement();
+ LOG.info("Non daemon thread {} is still alive", t.getName());
+ LOG.info(printStackTrace(t));
Review comment:
This is the sample stack trace after deploying it to internal cluster
```
2021-11-26 19:21:16,747 INFO [main] util.Threads - Non daemon thread
main.named-queue-events-pool-pool1-t1 is still alive
2021-11-26 19:21:16,748 INFO [main] util.Threads -
sun.misc.Unsafe.park(Native Method)
java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2044)
com.lmax.disruptor.BlockingWaitStrategy.waitFor(BlockingWaitStrategy.java:45)
com.lmax.disruptor.ProcessingSequenceBarrier.waitFor(ProcessingSequenceBarrier.java:56)
com.lmax.disruptor.BatchEventProcessor.run(BatchEventProcessor.java:124)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
java.lang.Thread.run(Thread.java:748)
```
There is no easy method to print stack trace given a thread handle.
`Thread#dumpStack` dumps stack of current thread but we don't need that.
Cc @virajjasani @Apache9
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