编辑
显然,我所希望做的事情超出了thrift的范围...如果我确保端口上永远不会有多个客户端,一切都是没问题的。当然,这有点违背了初衷,因为我想打开几个可重用的连接到服务器,以提高响应时间和降低开销。
如果有人有一个替代方法来实现这一点,那将不胜感激(或者如果我的结论是错误的)。
背景
我有一个多组件应用程序,大部分都是通过thrift连接起来的(主要是java->php连接)。
到目前为止,一切都看起来很好,但是当我引入一个Java->Java连接时,客户端端点是一个可以启动数百个请求/秒的servlet。
被访问的方法具有以下接口:
bool pvCheck(1:i32 toolId) throws(1:DPNoToolException nte),
为了确保不是服务端出现问题,我用一个简单的实现替换了它:
@Override
public boolean pvCheck(int toolId) throws TException {
//boolean ret = api.getViewsAndDec(toolId);
return true;
}
错误/可能的原因?
只要连接不多,一切都正常,但是当连接越来越接近时,连接开始在读取器中卡住。
如果我在调试器中查看其中一个连接,堆栈如下:
Daemon Thread [http-8080-197] (Suspended)
BufferedInputStream.read(byte[], int, int) line: 308
TSocket(TIOStreamTransport).read(byte[], int, int) line: 126
TSocket(TTransport).readAll(byte[], int, int) line: 84
TBinaryProtocol.readAll(byte[], int, int) line: 314
TBinaryProtocol.readI32() line: 262
TBinaryProtocol.readMessageBegin() line: 192
DumboPayment$Client.recv_pvCheck() line: 120
DumboPayment$Client.pvCheck(int) line: 105
Receiver.performTask(HttpServletRequest, HttpServletResponse) line: 157
Receiver.doGet(HttpServletRequest, HttpServletResponse) line: 109
Receiver(HttpServlet).service(HttpServletRequest, HttpServletResponse) line: 617
Receiver(HttpServlet).service(ServletRequest, ServletResponse) line: 717
ApplicationFilterChain.internalDoFilter(ServletRequest, ServletResponse) line: 290
ApplicationFilterChain.doFilter(ServletRequest, ServletResponse) line: 206
StandardWrapperValve.invoke(Request, Response) line: 233
StandardContextValve.invoke(Request, Response) line: 191
StandardHostValve.invoke(Request, Response) line: 127
ErrorReportValve.invoke(Request, Response) line: 102
StandardEngineValve.invoke(Request, Response) line: 109
CoyoteAdapter.service(Request, Response) line: 298
Http11AprProcessor.process(long) line: 859
Http11AprProtocol$Http11ConnectionHandler.process(long) line: 579
AprEndpoint$Worker.run() line: 1555
Thread.run() line: 619
这似乎是由于数据损坏而触发的,因为我遇到了以下异常:
10/11/22 18:38:55 WARN logger.Receiver: pvCheck had an exception
org.apache.thrift.TApplicationException: pvCheck failed: unknown result
at *.thrift.generated.DumboPayment$Client.recv_pvCheck(DumboPayment.java:135)
at *.thrift.generated.DumboPayment$Client.pvCheck(DumboPayment.java:105)
at *.Receiver.performTask(Receiver.java:157)
at *.Receiver.doGet(Receiver.java:109)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:859)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1555)
at java.lang.Thread.run(Thread.java:619)
并且
10/11/22 17:59:46 ERROR [/ninja_ar].[Receiver]: サーブレット Receiver のServlet.service()が例外を投げました
java.lang.OutOfMemoryError: Java heap space
at org.apache.thrift.protocol.TBinaryProtocol.readStringBody(TBinaryProtocol.java:296)
at org.apache.thrift.protocol.TBinaryProtocol.readString(TBinaryProtocol.java:290)
at org.apache.thrift.protocol.TBinaryProtocol.readMessageBegin(TBinaryProtocol.java:198)
at *.thrift.generated.DumboPayment$Client.recv_pvCheck(DumboPayment.java:120)
at *.thrift.generated.DumboPayment$Client.pvCheck(DumboPayment.java:105)
at *.Receiver.performTask(Receiver.java:157)
at *.Receiver.doGet(Receiver.java:109)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
at java.lang.Thread.run(Thread.java:636)
也许我有些离谱,但我相当确定这与客户端在没有发送任何内容时继续尝试读取有关。
一些实现细节:
服务器和客户端都使用Java二进制协议。
我编写了一个简单的客户端池类,它使我可以重用客户端,这些是主要功能:
public synchronized Client getClient() {
if(clientQueue.isEmpty()) {
return newClient();
} else {
return clientQueue.getLast();
}
}
private synchronized Client newClient() {
int leftToTry = serverArr.length;
Client cli = null;
while(leftToTry > 0 && cli == null) {
log.info("Creating new connection to " +
serverArr[roundRobinPos] + port);
TTransport transport = new TSocket(serverArr[roundRobinPos], port);
TProtocol protocol = new TBinaryProtocol(transport);
cli = new Client(protocol);
try {
transport.open();
} catch (TTransportException e) {
cli = null;
log.warn("Failed connection to " +
serverArr[roundRobinPos] + port);
}
roundRobinPos++;
if(roundRobinPos >= serverArr.length) {
roundRobinPos = 0;
}
leftToTry--;
}
return cli;
}
public void returnClient(Client cli) {
clientQueue.addFirst(cli);
}
客户端应用程序(即Tomcat Servlet)以下列方式访问它:
Client dpayClient = null;
if(dpay != null
&& (dpayClient = dpay.getClient()) != null) {
try {
dpayClient.pvCheck(requestParameters.getId());
} catch (DPNoToolException e) {
return;
} catch (TException e) {
log.warn("pvCheck had an exception", e);
} finally {
if(dpayClient != null) {
dpay.returnClient(dpayClient);
}
}
}
实际的Thrift连接是通过以下方式提升的。
private boolean initThrift(int port, Configuration conf) {
TProtocolFactory protocolFactory = new TBinaryProtocol.Factory();
DPaymentHandler handler = new DPaymentHandler(conf);
DumboPayment.Processor processor =
new DumboPayment.Processor(handler);
InetAddress listenAddress;
try {
listenAddress = InetAddress.getLocalHost();
} catch (UnknownHostException e) {
LOG.error("Failed in thrift init", e);
return false;
}
TServerTransport serverTransport;
try {
serverTransport = new TServerSocket(
new InetSocketAddress(listenAddress, port));
} catch (TTransportException e) {
LOG.error("Failed in thrift init", e);
return false;
}
TTransportFactory transportFactory = new TTransportFactory();
TServer server = new TThreadPoolServer(processor, serverTransport,
transportFactory, protocolFactory);
LOG.info("Starting Dumbo Payment thrift server on " +
listenAddress + ":" + Integer.toString(port));
server.serve();
return true;
}
最后
我已经卡在这个问题上有一段时间了……可能我错过了一些明显的东西。希望能得到任何帮助。
如果需要任何额外的信息,请让我知道。这里有很多话,所以我想尽量只保留最相关的内容。