java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject

Google Groups | Unknown author | 6 months ago
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    java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject
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    java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject
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    java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject
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    CPU Loading High - Lock find in elastic search

    Google Groups | 2 years ago | Unknown author
    java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject
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    Executing this multiple times occasionally shows 2 non daemon threads that are not letting application die. Those threads go away generally with in a minute. Those 2 threads are shown below. Is there a reason for them to be non daemon? public static void main(String[] args) throws IOException { CassandraCluster cluster = CassandraCluster.builder(). withContactPointsLocator(localContactPointsLocator). withClusterName(clusterName). withDataCenter(datacenter). withApplication(clusterName). build(); Session session = cluster.connect(); session.close(); cluster.close(); System.out.println("Main thread finished!"); } "Cassandra Java Driver blocking tasks worker-1" prio=5 tid=7fb6a10b9800 nid=0x115e8f000 waiting on condition [115e8e000] java.lang.Thread.State: TIMED_WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <7f4532b90> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:196) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2025) at java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:424) at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:955) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:917) at java.lang.Thread.run(Thread.java:695) Locked ownable synchronizers: - None "Cassandra Java Driver blocking tasks worker-0" prio=5 tid=7fb6a10b9000 nid=0x115d8c000 waiting on condition [115d8b000] java.lang.Thread.State: TIMED_WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <7f4532b90> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:196) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2025) at java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:424) at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:955) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:917) at java.lang.Thread.run(Thread.java:695) Locked ownable synchronizers: - None

    DataStax JIRA | 3 years ago | Vishy Kasar
    java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject

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    Root Cause Analysis

    1. java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject

      No message provided

      at java.util.concurrent.locks.LockSupport.park()
    2. Java RT
      Thread.run
      1. java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
      2. java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
      3. java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
      4. java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
      5. java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
      6. java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
      7. java.lang.Thread.run(Thread.java:745)
      7 frames