Question

我在运行Tomcat的生产服务器上运行了三个相隔10秒的线程转储。我发现同一个线程（相同的线程id）出现在所有三个线程转储中，并且正在执行完全相同的事情 - 处理JSP页面。这是否意味着它被卡住了？或者可能是来自Tomcat线程池的同一个线程不断被一次又一次地分配相同的任务。

这是一个适度大的应用程序，有很多servlet / JSP页面，业务逻辑和数据库。此外，它相当繁忙（每秒约20个请求）。 Tomcat独立运行（不在Apache之后）。

编辑1（附加信息）：主页通常需要不到10秒的时间进行渲染，因此这不是对主页的典型单一请求。

编辑2：我在几个小时之后接受了另一个线程转储（但没有重新启动Tomcat），这个特定的线程正在做其他事情。这是否意味着线程没有被卡住？

以下是该特定线程的线程转储部分（只列出一个，因为其他两个完全相同）：

"http-bio-8080-exec-220" daemon prio=10 tid=0x00007f5c801de800 nid=0x3151 runnable [0x00007f5c74d28000]
   java.lang.Thread.State: RUNNABLE
    at java.net.SocketOutputStream.socketWrite0(Native Method)
    at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:113)
    at java.net.SocketOutputStream.write(SocketOutputStream.java:159)
    at org.apache.coyote.http11.InternalOutputBuffer.realWriteBytes(InternalOutputBuffer.java:215)
    at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:480)
    at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:366)
    at org.apache.coyote.http11.InternalOutputBuffer$OutputStreamOutputBuffer.doWrite(InternalOutputBuffer.java:240)
    at org.apache.coyote.http11.filters.ChunkedOutputFilter.doWrite(ChunkedOutputFilter.java:119)
    at org.apache.coyote.http11.AbstractOutputBuffer.doWrite(AbstractOutputBuffer.java:192)
    at org.apache.coyote.Response.doWrite(Response.java:517)
    at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:408)
    at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:480)
    at org.apache.catalina.connector.OutputBuffer.realWriteChars(OutputBuffer.java:487)
    at org.apache.tomcat.util.buf.CharChunk.append(CharChunk.java:312)
    at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:528)
    at org.apache.catalina.connector.CoyoteWriter.write(CoyoteWriter.java:152)
    at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:119)
    at org.apache.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:336)
    at java.io.Writer.write(Writer.java:157)
    at org.apache.jasper.runtime.JspWriterImpl.print(JspWriterImpl.java:473)
    at org.apache.taglibs.standard.tag.common.core.UrlSupport.doEndTag(UrlSupport.java:127)
    at org.apache.jsp.WEB_002dINF.jsp.site.home_jsp._jspx_meth_c_005furl_005f22(home_jsp.java:1172)
    at org.apache.jsp.WEB_002dINF.jsp.site.home_jsp._jspx_meth_c_005fif_005f2(home_jsp.java:1141)
    at org.apache.jsp.WEB_002dINF.jsp.site.home_jsp._jspx_meth_c_005fforEach_005f1(home_jsp.java:1102)
    at org.apache.jsp.WEB_002dINF.jsp.site.home_jsp._jspService(home_jsp.java:308)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:487)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:412)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
    at inspirasites.servlets.HomeServlet.doGet(HomeServlet.java:102)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at inspirasites.filters.CharEncodingFilter.doFilter(CharEncodingFilter.java:23)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at inspirasites.filters.SiteFilter.doFilter(SiteFilter.java:45)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    - locked <0x00000000e12fb330> (a org.apache.tomcat.util.net.SocketWrapper)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)

Answer 1

我最近在应用程序中看到了完全相同的行为，并且能够重现它。它可能是由发送请求但不消耗响应数据的行为不当的客户端引起的。在这种情况下，套接字将阻止，请参阅此问题的答案：Is an OutputStream in Java blocking? (Sockets)

Tomcat线程转储 - 可能被困的线程

1 个答案: