使用反应式Mongo驱动程序时，Scala控制台应用程序不会退出

时间：2019-02-05 13:36:12

标签： mongodb scala concurrency reactivemongo

我正在使用ReactiveMongo 0.16.1和MongoDB 4.0。

在Main类中，我运行以下命令：

  DataManager.processFeedbacks
  val future1 = DataManager.processNewEvaluations
  val future2 = DataManager.processPurchases
  val future3 = DataManager.processExpiredEvaluations
  val future4 = DataManager.processExpiredCommerialLicenses
  val futures = List(future1, future2, future3, future4).map(_.map(Try(_)))
  val complete = Future.sequence(futures).onComplete _
  complete(_ => {
    DatabaseConfigService.closeDriver
  })

除了我无法关闭驱动程序并且主线程继续挂起，不允许应用程序退出之外，所有工作正常。

在closeDriver()中，我尝试了driver.close，conn.askClose()(Duration.create(10, TimeUnit.SECONDS)和

futureConnection.map(conn => {
     conn.askClose()(Duration.create(10, TimeUnit.SECONDS))
       .onComplete(y => driver.close())
   })

您可能会猜到，所有结果都没有。

以下是转储线程：

2019-02-05 14:33:18
Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.191-b12 mixed mode):

"Analytics" #68 prio=1 os_prio=31 tid=0x00007fc9fd92c800 nid=0x9f07 waiting on condition [0x000070000dc97000]
   java.lang.Thread.State: WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x000000076b960148> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
    at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at com.segment.analytics.Platform$1$1.run(Platform.java:45)
    at java.lang.Thread.run(Thread.java:748)

"DestroyJavaVM" #40 prio=5 os_prio=31 tid=0x00007fc9fc0ff000 nid=0x1903 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Analytics" #32 prio=1 os_prio=31 tid=0x00007fc9fe0b4800 nid=0x6203 waiting on condition [0x000070000eecd000]
   java.lang.Thread.State: TIMED_WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x000000076ba51808> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
    at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093)
    at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at com.segment.analytics.Platform$1$1.run(Platform.java:45)
    at java.lang.Thread.run(Thread.java:748)

"Analytics" #31 prio=1 os_prio=31 tid=0x00007fc9fe0b2800 nid=0x6103 waiting on condition [0x000070000edca000]
   java.lang.Thread.State: WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x000000076ba3a870> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
    at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
    at com.segment.analytics.internal.AnalyticsClient$Looper.run(AnalyticsClient.java:106)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at com.segment.analytics.Platform$1$1.run(Platform.java:45)
    at java.lang.Thread.run(Thread.java:748)

"Service Thread" #10 daemon prio=9 os_prio=31 tid=0x00007fc9fe0dd000 nid=0x3e03 runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C1 CompilerThread3" #9 daemon prio=9 os_prio=31 tid=0x00007fc9ff00b800 nid=0x4003 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C2 CompilerThread2" #8 daemon prio=9 os_prio=31 tid=0x00007fc9fc801000 nid=0x3c03 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C2 CompilerThread1" #7 daemon prio=9 os_prio=31 tid=0x00007fc9fc1b1800 nid=0x3b03 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C2 CompilerThread0" #6 daemon prio=9 os_prio=31 tid=0x00007fc9fe0dc800 nid=0x3903 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Monitor Ctrl-Break" #5 daemon prio=5 os_prio=31 tid=0x00007fc9fe0db000 nid=0x3703 runnable [0x000070000d582000]
   java.lang.Thread.State: RUNNABLE
    at java.net.SocketInputStream.socketRead0(Native Method)
    at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
    at java.net.SocketInputStream.read(SocketInputStream.java:171)
    at java.net.SocketInputStream.read(SocketInputStream.java:141)
    at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:284)
    at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:326)
    at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
    - locked <0x00000006c0015800> (a java.io.InputStreamReader)
    at java.io.InputStreamReader.read(InputStreamReader.java:184)
    at java.io.BufferedReader.fill(BufferedReader.java:161)
    at java.io.BufferedReader.readLine(BufferedReader.java:324)
    - locked <0x00000006c0015800> (a java.io.InputStreamReader)
    at java.io.BufferedReader.readLine(BufferedReader.java:389)
    at com.intellij.rt.execution.application.AppMainV2$1.run(AppMainV2.java:64)

"Signal Dispatcher" #4 daemon prio=9 os_prio=31 tid=0x00007fc9fb85d000 nid=0x4303 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Finalizer" #3 daemon prio=8 os_prio=31 tid=0x00007fc9fd800000 nid=0x4703 in Object.wait() [0x000070000d37c000]
   java.lang.Thread.State: WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    - waiting on <0x00000006c00170e0> (a java.lang.ref.ReferenceQueue$Lock)
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:144)
    - locked <0x00000006c00170e0> (a java.lang.ref.ReferenceQueue$Lock)
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:165)
    at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:216)

"Reference Handler" #2 daemon prio=10 os_prio=31 tid=0x00007fc9fb83f800 nid=0x4903 in Object.wait() [0x000070000d279000]
   java.lang.Thread.State: WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    - waiting on <0x00000006c001e220> (a java.lang.ref.Reference$Lock)
    at java.lang.Object.wait(Object.java:502)
    at java.lang.ref.Reference.tryHandlePending(Reference.java:191)
    - locked <0x00000006c001e220> (a java.lang.ref.Reference$Lock)
    at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)

"VM Thread" os_prio=31 tid=0x00007fc9fb839000 nid=0x4b03 runnable 

"GC task thread#0 (ParallelGC)" os_prio=31 tid=0x00007fc9fe801800 nid=0x2507 runnable 

"GC task thread#1 (ParallelGC)" os_prio=31 tid=0x00007fc9fe802800 nid=0x2a03 runnable 

"GC task thread#2 (ParallelGC)" os_prio=31 tid=0x00007fc9fe803000 nid=0x2b03 runnable 

"GC task thread#3 (ParallelGC)" os_prio=31 tid=0x00007fc9ff000000 nid=0x5203 runnable 

"GC task thread#4 (ParallelGC)" os_prio=31 tid=0x00007fc9ff001000 nid=0x5003 runnable 

"GC task thread#5 (ParallelGC)" os_prio=31 tid=0x00007fc9ff800000 nid=0x4f03 runnable 

"GC task thread#6 (ParallelGC)" os_prio=31 tid=0x00007fc9fe00a000 nid=0x2d03 runnable 

"GC task thread#7 (ParallelGC)" os_prio=31 tid=0x00007fc9ff801000 nid=0x2e03 runnable 

"VM Periodic Task Thread" os_prio=31 tid=0x00007fc9fe800000 nid=0x5503 waiting on condition 

JNI global references: 2012

Heap
 PSYoungGen      total 116736K, used 58485K [0x000000076ab00000, 0x0000000772a80000, 0x00000007c0000000)
  eden space 105984K, 55% used [0x000000076ab00000,0x000000076e41d548,0x0000000771280000)
  from space 10752K, 0% used [0x0000000771d00000,0x0000000771d00000,0x0000000772780000)
  to   space 10752K, 0% used [0x0000000771280000,0x0000000771280000,0x0000000771d00000)
 ParOldGen       total 141312K, used 10517K [0x00000006c0000000, 0x00000006c8a00000, 0x000000076ab00000)
  object space 141312K, 7% used [0x00000006c0000000,0x00000006c0a45578,0x00000006c8a00000)
 Metaspace       used 38906K, capacity 42786K, committed 42968K, reserved 1087488K
  class space    used 5527K, capacity 5819K, committed 5888K, reserved 1048576K

P.S。看来我有the same problem as described here。但是，该帖子来自2015年，应该早就部署了修复程序。不过，我仍然无法关闭驱动程序。

1 个答案:

答案 0 :(得分：1)

通常，问题出在电脑和椅子之间。我在这里发布答案，希望有一天能对某人有所帮助。

我错过了代码DataManager.processFeedbacks的第一行也创造了未来。我不是在等待它的完成，而是太早关闭了驱动程序。

我通过再次检查转储线程并寻找我的代码正在使用的类来解决了这个问题。 processFeedbacks()函数

使用了其中一个类
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