java JVM在序列化过程中挂起
我正在调试每两天挂起一次的服务器
java version "1.8.0_201"
Java(TM) SE Runtime Environment (build 1.8.0_201-b09)
Java HotSpot(TM) 64-Bit Server VM (build 25.201-b09, mixed mode)
突然,一切都冻结了,服务器停止处理/接收任何请求(确切地说是任何工作)。捕获线程转储后,我注意到以下几点:
- 没有死锁,根据
jstack
- 199个线程处于
BLOCKED
状态,5个线程处于IN_NATIVE
状态,1个线程处于IN_VM
状态 - 所有阻塞线程都在
wait
/sleep
/receive
/etc方法上阻塞
只有IN_VM
中的线程实际显示了一些重要堆栈:
Thread 10453: (state = IN_VM)
- java.lang.System.identityHashCode(java.lang.Object) @bci=0 (Compiled frame; information may be imprecise)
- java.io.ObjectOutputStream$HandleTable.hash(java.lang.Object) @bci=1, line=2360 (Compiled frame)
- java.io.ObjectOutputStream$HandleTable.insert(java.lang.Object, int) @bci=2, line=2323 (Compiled frame)
- java.io.ObjectOutputStream$HandleTable.growSpine() @bci=57, line=2338 (Compiled frame)
- java.io.ObjectOutputStream$HandleTable.assign(java.lang.Object) @bci=28, line=2279 (Compiled frame)
- java.io.ObjectOutputStream.writeOrdinaryObject(java.lang.Object, java.io.ObjectStreamClass, boolean) @bci=105, line=1428 (Compiled frame)
- java.io.ObjectOutputStream.writeObject0(java.lang.Object, boolean) @bci=506, line=1178 (Compiled frame)
- java.io.ObjectOutputStream.writeObject(java.lang.Object) @bci=16, line=348 (Compiled frame)
- java.util.HashMap.internalWriteEntries(java.io.ObjectOutputStream) @bci=49, line=1793 (Compiled frame)
- java.util.HashMap.writeObject(java.io.ObjectOutputStream) @bci=24, line=1363 (Compiled frame)
- sun.reflect.GeneratedMethodAccessor13.invoke(java.lang.Object, java.lang.Object[]) @bci=40 (Compiled frame)
- sun.reflect.DelegatingMethodAccessorImpl.invoke(java.lang.Object, java.lang.Object[]) @bci=6, line=43 (Compiled frame)
- java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[]) @bci=56, line=498 (Compiled frame)
- java.io.ObjectStreamClass.invokeWriteObject(java.lang.Object, java.io.ObjectOutputStream) @bci=24, line=1140 (Compiled frame)
- java.io.ObjectOutputStream.writeSerialData(java.lang.Object, java.io.ObjectStreamClass) @bci=125, line=1497 (Compiled frame)
- java.io.ObjectOutputStream.writeOrdinaryObject(java.lang.Object, java.io.ObjectStreamClass, boolean) @bci=137, line=1432 (Compiled frame)
- java.io.ObjectOutputStream.writeObject0(java.lang.Object, boolean) @bci=506, line=1178 (Compiled frame)
- java.io.ObjectOutputStream.defaultWriteFields(java.lang.Object, java.io.ObjectStreamClass) @bci=18, line=1523 (Compiled frame)
- java.io.ObjectOutputStream.defaultWriteObject() @bci=41, line=441 (Compiled frame)
- java.util.Collections$SynchronizedMap.writeObject(java.io.ObjectOutputStream) @bci=8, line=2691 (Compiled frame)
- sun.reflect.GeneratedMethodAccessor12.invoke(java.lang.Object, java.lang.Object[]) @bci=40 (Compiled frame)
- sun.reflect.DelegatingMethodAccessorImpl.invoke(java.lang.Object, java.lang.Object[]) @bci=6, line=43 (Compiled frame)
- java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[]) @bci=56, line=498 (Compiled frame)
- java.io.ObjectStreamClass.invokeWriteObject(java.lang.Object, java.io.ObjectOutputStream) @bci=24, line=1140 (Compiled frame)
- java.io.ObjectOutputStream.writeSerialData(java.lang.Object, java.io.ObjectStreamClass) @bci=125, line=1497 (Compiled frame)
- java.io.ObjectOutputStream.writeOrdinaryObject(java.lang.Object, java.io.ObjectStreamClass, boolean) @bci=137, line=1432 (Compiled frame)
- java.io.ObjectOutputStream.writeObject0(java.lang.Object, boolean) @bci=506, line=1178 (Compiled frame)
- java.io.ObjectStreamClass$FieldReflector.getPrimFieldValues(java.lang.Object, byte[]) @bci=313, line=2135 (Compiled frame)
- java.io.ObjectStreamClass.getPrimFieldValues(java.lang.Object, byte[]) @bci=6, line=1389 (Compiled frame)
- java.io.ObjectOutputStream.defaultWriteFields(java.lang.Object, java.io.ObjectStreamClass) @bci=70, line=1533 (Compiled frame)
- java.io.ObjectOutputStream.writeSerialData(java.lang.Object, java.io.ObjectStreamClass) @bci=211, line=1509 (Compiled frame)
- java.io.ObjectOutputStream.writeOrdinaryObject(java.lang.Object, java.io.ObjectStreamClass, boolean) @bci=137, line=1432 (Compiled frame)
- java.io.ObjectOutputStream.writeObject0(java.lang.Object, boolean) @bci=506, line=1178 (Compiled frame)
- java.io.ObjectOutputStream$BlockDataOutputStream.flush() @bci=1, line=1822 (Compiled frame)
- java.io.ObjectOutputStream.flush() @bci=4, line=719 (Compiled frame)
....
....
- few more frames where we invoke `flush()`
我们尝试序列化的对象如下所示:
public class DomainObjectCollection implements Serializable
{
private static final long serialVersionUID = -2050273337993827124L;
private Map<String, DomainObject> objects;
private Map<String, List<DomainObject>> objectsForUsername;
public DomainObjectCollection()
{
this.objects = Collections.synchronizedMap(new HashMap<>());
this.objectsForUsername = Collections.synchronizedMap(new HashMap<>());
}
}
我们序列化对象非常简单:
os = new ObjectOutputStream(new BufferedOutputStream(new FileOutputStream(file), 128 * 1024));
os.writeObject(object);
os.flush();
所以,除了同步,没有什么特别的
有人遇到过类似的情况吗?如果我没有提供一些细节,请随时询问
更新
大约一小时前,从上面的线程转储中,我捕获了混合堆栈跟踪:
----------------- 10453 -----------------
0x00007f0e5b65d709 __pthread_cond_timedwait + 0x129
0x00007f0e5a8bcbb7 _ZN18ObjectSynchronizer12FastHashCodeEP6ThreadP7oopDesc + 0x377
0x00007f0e5a5746df JVM_IHashCode + 0x4f
0x00007f0e4577d13f <Unknown compiled code>
Locked ownable synchronizers:
- None
共 (0) 个答案