项目运行一段时间后会自动假死，使用jstack/jmap命令，服务恢复正常

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springcloud&sprinboot项目运行一段时间后会自动假死，使用jmap命令，服务恢复正常
最近发现项目中的B服务经常莫名假死，就是端口正常开放，cpu处于正常情况，从服务日志中可以看到B服务还可以处理C服务的请求，但是B服务无法响应A服务的请求，使用jstack命令，如下：

2019-07-07 22:09:32
Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.181-b13 mixed mode):

"Attach Listener" #222 daemon prio=9 os_prio=0 tid=0x00007f6d8800b000 nid=0x7a1e waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"http-nio-6010-exec-160" #221 daemon prio=5 os_prio=0 tid=0x00007f6cec088800 nid=0x7956 waiting on condition [0x00007f6cb6d59000]
   java.lang.Thread.State: WAITING (parking)
        at sun.misc.Unsafe.park(Native Method)
        - parking to wait for  <0x00000006c7fbcee0> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
        at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:870)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2083)
        at java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:467)
        at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:85)
        at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:31)
        at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1073)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:748)

"http-nio-6010-exec-159" #220 daemon prio=5 os_prio=0 tid=0x00007f6ce00b9000 nid=0x77e2 waiting on condition [0x00007f6cb6dda000]
   java.lang.Thread.State: WAITING (parking)
        at sun.misc.Unsafe.park(Native Method)
        - parking to wait for  <0x00000006c7fbcee0> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
        at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:870)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2083)
        at java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:467)
        at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:85)
        at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:31)
        at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1073)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

使用jmap命令之后，服务自动恢复，

Attaching to process ID 29499, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 25.181-b13

using thread-local object allocation.
Parallel GC with 8 thread(s)

Heap Configuration:
   MinHeapFreeRatio         = 0
   MaxHeapFreeRatio         = 100
   MaxHeapSize              = 4294967296 (4096.0MB)
   NewSize                  = 134217728 (128.0MB)
   MaxNewSize               = 134217728 (128.0MB)
   OldSize                  = 2013265920 (1920.0MB)
   NewRatio                 = 2
   SurvivorRatio            = 8
   MetaspaceSize            = 536870912 (512.0MB)
   CompressedClassSpaceSize = 1065353216 (1016.0MB)
   MaxMetaspaceSize         = 1073741824 (1024.0MB)
   G1HeapRegionSize         = 0 (0.0MB)

Heap Usage:
PS Young Generation
Eden Space:
   capacity = 132120576 (126.0MB)
   used     = 56769088 (54.13922119140625MB)
   free     = 75351488 (71.86077880859375MB)
   42.96763586619544% used
From Space:
   capacity = 1048576 (1.0MB)
   used     = 425984 (0.40625MB)
   free     = 622592 (0.59375MB)
   40.625% used
To Space:
   capacity = 1048576 (1.0MB)
   used     = 0 (0.0MB)
   free     = 1048576 (1.0MB