【发布时间】：2020-04-02 16:11:54
【问题描述】：
我有一个 java (AWS Java SDK 1.11.313) SQS 消费者每 20 秒轮询一次队列，该队列已运行近一周。在这段时间内，它两次失败，两次都抛出以下异常：
com.amazonaws.SdkClientException: Unable to execute HTTP request: Permission denied: connect
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.handleRetryableException(AmazonHttpClient.java:1114)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeHelper(AmazonHttpClient.java:1064)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.doExecute(AmazonHttpClient.java:743)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeWithTimer(AmazonHttpClient.java:717)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.execute(AmazonHttpClient.java:699)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.access$500(AmazonHttpClient.java:667)
at com.amazonaws.http.AmazonHttpClient$RequestExecutionBuilderImpl.execute(AmazonHttpClient.java:649)
at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:513)
at com.amazonaws.services.sqs.AmazonSQSClient.doInvoke(AmazonSQSClient.java:2033)
at com.amazonaws.services.sqs.AmazonSQSClient.invoke(AmazonSQSClient.java:2009)
at com.amazonaws.services.sqs.AmazonSQSClient.executeReceiveMessage(AmazonSQSClient.java:1485)
at com.amazonaws.services.sqs.AmazonSQSClient.receiveMessage(AmazonSQSClient.java:1460)
at net.myCompany.messageHandlers.QMessageHandler.receiveMsg(QMessageHandler.java:112)
at net.myCompany.MessageHandler.receiveDirectMsg(MessageHandler.java:23)
at net.myCompany.commandProcessors.QCommandProcessor.run(QCommandProcessor.java:23)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.net.SocketException: Permission denied: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:83)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at org.apache.http.conn.ssl.SSLConnectionSocketFactory.connectSocket(SSLConnectionSocketFactory.java:339)
at com.amazonaws.http.conn.ssl.SdkTLSSocketFactory.connectSocket(SdkTLSSocketFactory.java:132)
at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:142)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:373)
at sun.reflect.GeneratedMethodAccessor21.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.amazonaws.http.conn.ClientConnectionManagerFactory$Handler.invoke(ClientConnectionManagerFactory.java:76)
at com.amazonaws.http.conn.$Proxy9.connect(Unknown Source)
at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:381)
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:237)
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56)
at com.amazonaws.http.apache.client.impl.SdkHttpClient.execute(SdkHttpClient.java:72)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeOneRequest(AmazonHttpClient.java:1236)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeHelper(AmazonHttpClient.java:1056)
... 14 more
在这两种情况下，客户都在约 15 分钟后恢复。下面的方法负责创建和发送接收请求。异常出现在 for 循环上方的 sqs.receiveMessage() 方法调用上。每次发送请求时，都会创建一个新的 com.amazonaws.services.sqs.AmazonSQS 实例并将其分配给 sqs 变量。
List<JSONObject> receiveMsg() {
List<JSONObject> cmdMsgList = new ArrayList<>();
try {
if(sqs != null) {
System.out.println("Attempting message receive at: " + Instant.now());
// Receive messages
ReceiveMessageRequest receiveMessageRequest = new ReceiveMessageRequest(commandQUrl);
receiveMessageRequest.setWaitTimeSeconds(20);
receiveMessageRequest.setMaxNumberOfMessages(10);
List<Message> messages = sqs.receiveMessage(receiveMessageRequest).getMessages();
for (Message message : messages) {
JSONObject msgBody = checkTargetDevice(message);
if (msgBody != null) {
cmdMsgList.add(msgBody);
}
}
} else {
ServiceManager.getInstance().setServerConnection(false);
ServiceManager.getInstance().setConnectionStatus("Can't receive message - Message channel does not exist");
}
} catch (QueueDoesNotExistException mia) {
ServiceManager.getInstance().setServerConnection(false);
}catch (AmazonServiceException ase) {
if(ServiceManager.getInstance().isDebug()) {
ase.printStackTrace();
ase.getErrorMessage();
}
} catch (AmazonClientException ace) {
if(ServiceManager.getInstance().isDebug()) {
ace.printStackTrace();
}
}
return cmdMsgList;
}
我认为可能创建了太多连接并且没有正确关闭但是在使用 netstat 之后它似乎并不过分，该程序只有几个 tcp 连接。我已经在 return 语句之前添加了 sqs.shutdown() 调用，但是我不期待有太大的变化，因为 AWS documentation 声明 AmazonSQS 接口上的此方法调用 是一个可选方法，并且不希望调用者叫它。
非常感谢您对此问题的任何见解或建议。提前致谢。
【问题讨论】：
标签： java amazon-web-services amazon-sqs