Java ExecuterService死锁？

最近我写了一些代码来从Web上读取JSON数据，并根据收到的数据更新MongoDB条目。这必须完成大约500,000条目。为了加速这个过程，我使用了一个带有5个线程的ThreadPoolExecutor和一个大小为50的阻塞队列。此外，我使用CallerRunsPolicy来处理超额作业。对于每个工人的工作如下：从URL对应的MongoDB入门 Java ExecuterService死锁？

然而PROGRAMM卡住每次

读取JSON数据
解析JSON

更新。有时很早，有时只有几个小时之后。到目前为止，我还没有在代码中发现任何错误。异常处理但不会抛出，所有使用的方法应该是线程安全的。

这里是线程转储PROGRAMM挂起后：

2016-01-16 23:40:05 
Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.66-b18 mixed mode): 

"JMX server connection timeout 711" #711 daemon prio=5 os_prio=0 tid=0x000000001813d000 nid=0x4e8 in Object.wait() [0x000000004733f000] 
    java.lang.Thread.State: TIMED_WAITING (on object monitor) 
    at java.lang.Object.wait(Native Method) 
    at com.sun.jmx.remote.internal.ServerCommunicatorAdmin$Timeout.run(Unknown Source) 
    - locked <0x00000000e26162c8> (a [I) 
    at java.lang.Thread.run(Unknown Source) 

    Locked ownable synchronizers: 
    - None 

"RMI Scheduler(0)" #710 daemon prio=5 os_prio=0 tid=0x000000001813b800 nid=0x1ba0 waiting on condition [0x000000004723f000] 
    java.lang.Thread.State: TIMED_WAITING (parking) 
    at sun.misc.Unsafe.park(Native Method) 
    - parking to wait for <0x00000000e1ce64e0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) 
    at java.util.concurrent.locks.LockSupport.parkNanos(Unknown Source) 
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(Unknown Source) 
    at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(Unknown Source) 
    at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    at java.lang.Thread.run(Unknown Source) 

    Locked ownable synchronizers: 
    - None 

"RMI TCP Connection(1)-192.168.56.1" #709 daemon prio=5 os_prio=0 tid=0x0000000017714000 nid=0x11f0 runnable [0x000000004713e000] 
    java.lang.Thread.State: RUNNABLE 
    at java.net.SocketInputStream.socketRead0(Native Method) 
    at java.net.SocketInputStream.socketRead(Unknown Source) 
    at java.net.SocketInputStream.read(Unknown Source) 
    at java.net.SocketInputStream.read(Unknown Source) 
    at java.io.BufferedInputStream.fill(Unknown Source) 
    at java.io.BufferedInputStream.read(Unknown Source) 
    - locked <0x00000000e25e5fe8> (a java.io.BufferedInputStream) 
    at java.io.FilterInputStream.read(Unknown Source) 
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source) 
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source) 
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$256(Unknown Source) 
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$$Lambda$1/917377658.run(Unknown Source) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    at java.lang.Thread.run(Unknown Source) 

    Locked ownable synchronizers: 
    - <0x00000000e23ce048> (a java.util.concurrent.ThreadPoolExecutor$Worker) 

"RMI TCP Accept-0" #708 daemon prio=5 os_prio=0 tid=0x0000000017fa2000 nid=0xd18 runnable [0x0000000046f3e000] 
    java.lang.Thread.State: RUNNABLE 
    at java.net.DualStackPlainSocketImpl.accept0(Native Method) 
    at java.net.DualStackPlainSocketImpl.socketAccept(Unknown Source) 
    at java.net.AbstractPlainSocketImpl.accept(Unknown Source) 
    at java.net.PlainSocketImpl.accept(Unknown Source) 
    - locked <0x00000000e1ce8078> (a java.net.SocksSocketImpl) 
    at java.net.ServerSocket.implAccept(Unknown Source) 
    at java.net.ServerSocket.accept(Unknown Source) 
    at sun.management.jmxremote.LocalRMIServerSocketFactory$1.accept(Unknown Source) 
    at sun.rmi.transport.tcp.TCPTransport$AcceptLoop.executeAcceptLoop(Unknown Source) 
    at sun.rmi.transport.tcp.TCPTransport$AcceptLoop.run(Unknown Source) 
    at java.lang.Thread.run(Unknown Source) 

    Locked ownable synchronizers: 
    - None 

"pool-1-thread-5" #19 prio=5 os_prio=0 tid=0x000000001859e000 nid=0x628 waiting on condition [0x0000000018f9e000] 
    java.lang.Thread.State: WAITING (parking) 
    at sun.misc.Unsafe.park(Native Method) 
    - parking to wait for <0x00000000a57af940> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) 
    at java.util.concurrent.locks.LockSupport.park(Unknown Source) 
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source) 
    at java.util.concurrent.ArrayBlockingQueue.take(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    at java.lang.Thread.run(Unknown Source) 

    Locked ownable synchronizers: 
    - None 

"pool-1-thread-4" #18 prio=5 os_prio=0 tid=0x000000001859d800 nid=0x2208 waiting on condition [0x0000000018e9f000] 
    java.lang.Thread.State: WAITING (parking) 
    at sun.misc.Unsafe.park(Native Method) 
    - parking to wait for <0x00000000a57af940> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) 
    at java.util.concurrent.locks.LockSupport.park(Unknown Source) 
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source) 
    at java.util.concurrent.ArrayBlockingQueue.take(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    at java.lang.Thread.run(Unknown Source) 

    Locked ownable synchronizers: 
    - None 

"pool-1-thread-3" #17 prio=5 os_prio=0 tid=0x000000001859c800 nid=0x239c waiting on condition [0x0000000018d9e000] 
    java.lang.Thread.State: WAITING (parking) 
    at sun.misc.Unsafe.park(Native Method) 
    - parking to wait for <0x00000000a57af940> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) 
    at java.util.concurrent.locks.LockSupport.park(Unknown Source) 
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source) 
    at java.util.concurrent.ArrayBlockingQueue.take(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    at java.lang.Thread.run(Unknown Source) 

    Locked ownable synchronizers: 
    - None 

"pool-1-thread-2" #16 prio=5 os_prio=0 tid=0x000000001859a000 nid=0x18a8 runnable [0x0000000018c9e000] 
    java.lang.Thread.State: RUNNABLE 
    at java.net.SocketInputStream.socketRead0(Native Method) 
    at java.net.SocketInputStream.socketRead(Unknown Source) 
    at java.net.SocketInputStream.read(Unknown Source) 
    at java.net.SocketInputStream.read(Unknown Source) 
    at java.io.BufferedInputStream.fill(Unknown Source) 
    at java.io.BufferedInputStream.read1(Unknown Source) 
    at java.io.BufferedInputStream.read(Unknown Source) 
    - locked <0x00000000f921a080> (a java.io.BufferedInputStream) 
    at sun.net.www.http.HttpClient.parseHTTPHeader(Unknown Source) 
    at sun.net.www.http.HttpClient.parseHTTP(Unknown Source) 
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source) 
    - locked <0x00000000f921a0c0> (a sun.net.www.protocol.http.HttpURLConnection) 
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) 
    - locked <0x00000000f921a0c0> (a sun.net.www.protocol.http.HttpURLConnection) 
    at java.net.URL.openStream(Unknown Source) 
    at Pr0grammDB.readURL(Pr0grammDB.java:217) 
    at Pr0grammDB.readJSON(Pr0grammDB.java:210) 
    at Pr0grammDB$1Job.run(Pr0grammDB.java:98) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    at java.lang.Thread.run(Unknown Source) 

    Locked ownable synchronizers: 
    - <0x00000000a57afa50> (a java.util.concurrent.ThreadPoolExecutor$Worker) 

"pool-1-thread-1" #15 prio=5 os_prio=0 tid=0x0000000018599000 nid=0x20fc waiting on condition [0x0000000018b9f000] 
    java.lang.Thread.State: WAITING (parking) 
    at sun.misc.Unsafe.park(Native Method) 
    - parking to wait for <0x00000000a57af940> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) 
    at java.util.concurrent.locks.LockSupport.park(Unknown Source) 
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source) 
    at java.util.concurrent.ArrayBlockingQueue.take(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    at java.lang.Thread.run(Unknown Source) 

    Locked ownable synchronizers: 
    - None 

"pool-1-thread-1" #12 daemon prio=5 os_prio=0 tid=0x0000000017ecc800 nid=0x2bd8 waiting on condition [0x000000001879f000] 
    java.lang.Thread.State: TIMED_WAITING (parking) 
    at sun.misc.Unsafe.park(Native Method) 
    - parking to wait for <0x00000000a57af298> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) 
    at java.util.concurrent.locks.LockSupport.parkNanos(Unknown Source) 
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(Unknown Source) 
    at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(Unknown Source) 
    at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    at java.lang.Thread.run(Unknown Source) 

    Locked ownable synchronizers: 
    - None 

"cluster-ClusterId{value='569a6466a802c513644d5a51', description='null'}-127.0.0.1:27017" #11 daemon prio=5 os_prio=0 tid=0x000000001785e000 nid=0x1de8 waiting on condition [0x000000001869e000] 
    java.lang.Thread.State: TIMED_WAITING (parking) 
    at sun.misc.Unsafe.park(Native Method) 
    - parking to wait for <0x00000000a57ad528> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) 
    at java.util.concurrent.locks.LockSupport.parkNanos(Unknown Source) 
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(Unknown Source) 
    at com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable.waitForSignalOrTimeout(DefaultServerMonitor.java:237) 
    at com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable.waitForNext(DefaultServerMonitor.java:218) 
    at com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:167) 
    - locked <0x00000000a57ad270> (a com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable) 
    at java.lang.Thread.run(Unknown Source) 

    Locked ownable synchronizers: 
    - None 

"Service Thread" #9 daemon prio=9 os_prio=0 tid=0x0000000017493800 nid=0x23a8 runnable [0x0000000000000000] 
    java.lang.Thread.State: RUNNABLE 

    Locked ownable synchronizers: 
    - None 

"C1 CompilerThread2" #8 daemon prio=9 os_prio=2 tid=0x0000000015af8800 nid=0x2f5c waiting on condition [0x0000000000000000] 
    java.lang.Thread.State: RUNNABLE 

    Locked ownable synchronizers: 
    - None 

"C2 CompilerThread1" #7 daemon prio=9 os_prio=2 tid=0x0000000015af1800 nid=0x18c0 waiting on condition [0x0000000000000000] 
    java.lang.Thread.State: RUNNABLE 

    Locked ownable synchronizers: 
    - None 

"C2 CompilerThread0" #6 daemon prio=9 os_prio=2 tid=0x0000000015aef000 nid=0x15f8 waiting on condition [0x0000000000000000] 
    java.lang.Thread.State: RUNNABLE 

    Locked ownable synchronizers: 
    - None 

"Attach Listener" #5 daemon prio=5 os_prio=2 tid=0x0000000015aec800 nid=0x2074 waiting on condition [0x0000000000000000] 
    java.lang.Thread.State: RUNNABLE 

    Locked ownable synchronizers: 
    - None 

"Signal Dispatcher" #4 daemon prio=9 os_prio=2 tid=0x0000000015aec000 nid=0x2c94 runnable [0x0000000000000000] 
    java.lang.Thread.State: RUNNABLE 

    Locked ownable synchronizers: 
    - None 

"Finalizer" #3 daemon prio=8 os_prio=1 tid=0x00000000022b8000 nid=0x2f14 in Object.wait() [0x0000000016e4f000] 
    java.lang.Thread.State: WAITING (on object monitor) 
    at java.lang.Object.wait(Native Method) 
    - waiting on <0x00000000a57ebd08> (a java.lang.ref.ReferenceQueue$Lock) 
    at java.lang.ref.ReferenceQueue.remove(Unknown Source) 
    - locked <0x00000000a57ebd08> (a java.lang.ref.ReferenceQueue$Lock) 
    at java.lang.ref.ReferenceQueue.remove(Unknown Source) 
    at java.lang.ref.Finalizer$FinalizerThread.run(Unknown Source) 

    Locked ownable synchronizers: 
    - None 

"Reference Handler" #2 daemon prio=10 os_prio=2 tid=0x00000000022af000 nid=0x83c in Object.wait() [0x0000000016d4f000] 
    java.lang.Thread.State: WAITING (on object monitor) 
    at java.lang.Object.wait(Native Method) 
    - waiting on <0x00000000a57ebf20> (a java.lang.ref.Reference$Lock) 
    at java.lang.Object.wait(Unknown Source) 
    at java.lang.ref.Reference$ReferenceHandler.run(Unknown Source) 
    - locked <0x00000000a57ebf20> (a java.lang.ref.Reference$Lock) 

    Locked ownable synchronizers: 
    - None 

"main" #1 prio=5 os_prio=0 tid=0x000000000207e000 nid=0x1964 runnable [0x000000000217e000] 
    java.lang.Thread.State: RUNNABLE 
    at java.net.SocketInputStream.socketRead0(Native Method) 
    at java.net.SocketInputStream.socketRead(Unknown Source) 
    at java.net.SocketInputStream.read(Unknown Source) 
    at java.net.SocketInputStream.read(Unknown Source) 
    at java.io.BufferedInputStream.fill(Unknown Source) 
    at java.io.BufferedInputStream.read1(Unknown Source) 
    at java.io.BufferedInputStream.read(Unknown Source) 
    - locked <0x00000000f921c318> (a java.io.BufferedInputStream) 
    at sun.net.www.http.HttpClient.parseHTTPHeader(Unknown Source) 
    at sun.net.www.http.HttpClient.parseHTTP(Unknown Source) 
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source) 
    - locked <0x00000000f921c358> (a sun.net.www.protocol.http.HttpURLConnection) 
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) 
    - locked <0x00000000f921c358> (a sun.net.www.protocol.http.HttpURLConnection) 
    at java.net.URL.openStream(Unknown Source) 
    at Pr0grammDB.readURL(Pr0grammDB.java:217) 
    at Pr0grammDB.readJSON(Pr0grammDB.java:210) 
    at Pr0grammDB$1Job.run(Pr0grammDB.java:98) 
    at java.util.concurrent.ThreadPoolExecutor$CallerRunsPolicy.rejectedExecution(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor.reject(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor.execute(Unknown Source) 
    at Pr0grammDB.addAdditionalData(Pr0grammDB.java:114) 
    at Pr0grammDB.main(Pr0grammDB.java:48) 

    Locked ownable synchronizers: 
    - None 

"VM Thread" os_prio=2 tid=0x0000000015ab7000 nid=0x684 runnable 

"GC task thread#0 (ParallelGC)" os_prio=0 tid=0x00000000021d7800 nid=0x28e0 runnable 

"GC task thread#1 (ParallelGC)" os_prio=0 tid=0x00000000021d9000 nid=0x2658 runnable 

"GC task thread#2 (ParallelGC)" os_prio=0 tid=0x00000000021da800 nid=0x273c runnable 

"GC task thread#3 (ParallelGC)" os_prio=0 tid=0x00000000021dd000 nid=0x20f8 runnable 

"VM Periodic Task Thread" os_prio=2 tid=0x00000000174a2000 nid=0x824 waiting on condition 

JNI global references: 385

除了一个所有线程都似乎在等待着。但我不知道他们在等什么。另一个似乎卡在socketRead中。

当代码挂起时，堆的使用情况也有点怪异。在降至100MB并重复之前，它升至约400MB。一个周期约需1小时。

也许你可以帮我找到问题吗？

来源

2016-01-16 Rocreex

这500,000项，他们在哪里取自？ –

它们来自我在此过程中写入的数据库。与此同时，我增加了URLConnections的超时时间，它似乎到目前为止工作。但是，在等待HTTP答案的同时，一个线程如何阻止所有其他线程呢？ – Rocreex

你有没有解决过这个问题？ – Arya

溶液中加入超时的URLConnection的，因为显然没有标准超时：

URL url = new URL(urlString); 
URLConnection urlConn = url.openConnection(); 
urlConn.setConnectTimeout(10000); 
urlConn.setReadTimeout(10000);

来源

2016-08-03 19:43:21 Rocreex

Java ExecuterService死锁？

回答

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