Hazelcast内存不足问题

Question

Hazelcast 3.3中经常出现内存不足的问题，我想知道节点有足够的内存和CPU，16GB Ram，8核处理器，仍然发生此错误。 它是一个单节点设置。

com.hazelcast.core.HazelcastException: Client is shutting down!!!
    at com.hazelcast.client.connection.nio.ClientConnection.innerClose(ClientConnection.java:302)
    at com.hazelcast.client.connection.nio.ClientConnection.close(ClientConnection.java:355)
    at com.hazelcast.client.connection.nio.ClientConnection.close(ClientConnection.java:230)
    at com.hazelcast.client.connection.nio.ClientConnectionManagerImpl.shutdown(ClientConnectionManagerImpl.java:249)
    at com.hazelcast.client.ClientOutOfMemoryHandler$ClientHelper.closeSockets(ClientOutOfMemoryHandler.java:54)
    at com.hazelcast.client.ClientOutOfMemoryHandler$ClientHelper.cleanResources(ClientOutOfMemoryHandler.java:45)
    at com.hazelcast.client.ClientOutOfMemoryHandler.onOutOfMemory(ClientOutOfMemoryHandler.java:34)
    at com.hazelcast.instance.OutOfMemoryErrorDispatcher.onOutOfMemory(OutOfMemoryErrorDispatcher.java:143)
    at com.hazelcast.spi.impl.BasicOperationService$OperationHandler.handleOperationError(BasicOperationService.java:827)
    at com.hazelcast.spi.impl.BasicOperationService$OperationHandler.handle(BasicOperationService.java:703)
    at com.hazelcast.spi.impl.BasicOperationService$OperationHandler.access$400(BasicOperationService.java:675)
    at com.hazelcast.spi.impl.BasicOperationService.runOperationOnCallingThread(BasicOperationService.java:229)
    at com.hazelcast.spi.impl.BasicInvocation.doInvokeLocal(BasicInvocation.java:286)
    at com.hazelcast.spi.impl.BasicInvocation.doInvoke(BasicInvocation.java:272)
    at com.hazelcast.spi.impl.BasicInvocation.invoke(BasicInvocation.java:232)
    at com.hazelcast.spi.impl.BasicInvocationBuilder.invoke(BasicInvocationBuilder.java:45)
    at com.hazelcast.client.impl.client.PartitionClientRequest.process(PartitionClientRequest.java:60)
    at com.hazelcast.client.impl.ClientEngineImpl$ClientPacketProcessor.processRequest(ClientEngineImpl.java:418)
    at com.hazelcast.client.impl.ClientEngineImpl$ClientPacketProcessor.run(ClientEngineImpl.java:357)
    at com.hazelcast.spi.impl.BasicOperationService$BasicDispatcherImpl.dispatch(BasicOperationService.java:546)
    at com.hazelcast.spi.impl.BasicOperationScheduler$OperationThread.process(BasicOperationScheduler.java:439)
    at com.hazelcast.spi.impl.BasicOperationScheduler$OperationThread.doRun(BasicOperationScheduler.java:433)
    at com.hazelcast.spi.impl.BasicOperationScheduler$OperationThread.run(BasicOperationScheduler.java:408)
    at ------ End remote and begin local stack-trace ------.(Unknown Source)
    at com.hazelcast.client.spi.impl.ClientCallFuture.resolveResponse(ClientCallFuture.java:192)
    at com.hazelcast.client.spi.impl.ClientCallFuture.get(ClientCallFuture.java:134)
    at com.hazelcast.client.spi.impl.ClientCallFuture.get(ClientCallFuture.java:111)
    at com.hazelcast.client.spi.ClientProxy.invoke(ClientProxy.java:110)
    at com.hazelcast.client.proxy.ClientMapProxy.get(ClientMapProxy.java:180)

对于“每次新运行”，都会在（大约）运行15分钟后发生。

此后，我们不断收到以下错误，

java.util.concurrent.RejectedExecutionException: Internal executor rejected task: java.util.concurrent.FutureTask@5463e258, because client is shutting down...
    at com.hazelcast.client.spi.impl.ClientExecutionServiceImpl$1.rejectedExecution(ClientExecutionServiceImpl.java:60)
    at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:821)
    at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1372)
    at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:110)
    at com.hazelcast.client.spi.impl.ClientExecutionServiceImpl.submitInternal(ClientExecutionServiceImpl.java:81)
    at com.hazelcast.client.connection.nio.ClientConnectionManagerImpl.getOrConnect(ClientConnectionManagerImpl.java:339)
    at com.hazelcast.client.connection.nio.ClientConnectionManagerImpl.tryToConnect(ClientConnectionManagerImpl.java:280)
    at com.hazelcast.client.spi.impl.ClientInvocationServiceImpl.send(ClientInvocationServiceImpl.java:120)
    at com.hazelcast.client.spi.impl.ClientInvocationServiceImpl.invokeOnRandomTarget(ClientInvocationServiceImpl.java:61)
    at com.hazelcast.client.spi.ProxyManager.initialize(ProxyManager.java:197)
    at com.hazelcast.client.spi.ProxyManager.getOrCreateProxy(ProxyManager.java:180)
    at com.hazelcast.client.HazelcastClient.getDistributedObject(HazelcastClient.java:461)
    at com.hazelcast.client.HazelcastClient.getMap(HazelcastClient.java:314)
    at com.hazelcast.client.HazelcastClientProxy.getMap(HazelcastClientProxy.java:97)

请，如果有任何配置设置，我需要添加？？？

对于信息 ：

没有添加驱逐策略 ，其默认值为NONE。 我正在将MAP STORE用于持久性策略，并将写入延迟设为1秒。

Answer 1

由于您没有支持合同，因此这是最有价值的答案。

1. 您有一个单节点设置，就像一个单节点群集听起来那样错误，以这种方式运行Hazelcast是错误的。 Hazelcast不是为单成员群集设计的（也没有任何意义）。

2. 堆数量设置为16GB。 您的预期数据值是多少？ 我的意思是您无法在16GB的堆中存储16GB的数据。

3. 当JVM运行OOME时，您是否尝试过进行堆转储？ 您是否看过它，看看是什么在吞噬您的记忆？ （如前所述，寻找“如何查找内存泄漏”）

4. 如果您没有选择驱逐，即使使用MapStore也不会驱逐。

5. 您是否尝试过使用不同的GC组合或完全尝试查看GC？ GC错误有多种。

6. 看来您的客户端正在运行OOME，所以问题可能根本就不是数据量。 但是，由于没有进一步的信息，因此很难推理。