Hi,
we are facing some weird problems at one of our customers.
Our application is running on a tomcat server behind a Apache2 Webserver
which does SSL.
The servers are connected with mod_proxy_ajp.
The network is a slow 2MBit WAN which is used to capacity.
Within this infrastructure we periodically get Broken Pipe Exceptions which
are caused by an IOException in JKInputStream.
Conspicuous is the following: When an IOException occurs in most of the
cases (not in all) it is followed by another one, exactly 30seconds later.
I think Apache tries to resend the request to tomcat after a timout is
reached.
The IOExceptions in JKInputStream are thrown on AjaxRequests only (realised
with wicktes AjaxFormSubmittingBehavior), which are done on every "onblur"
javascript event. Our app contains pretty complex forms, with many input
fields (>200). If one is tabbing fast through the form many ajax events are
fired...
I tried to reproduce this at our companies network with FireFox Network
throttling plugin (500Byte/s up and download), without luck.
Note:
The customer uses IE6 and IE7.
This problem arises at the special WAN Network only. Our customer has
another internal production system (same application) at a LAN network,
which does not face these Exceptions.
Does anybody has a hint or idea what could be going on? That would be great!
Many thanks in advance to everybody who investigates on this.
See bellow the stack traces:
catalina.out:
20.11.2009 10:22:29 org.apache.jk.core.MsgContext action
WARNUNG: Error sending end packet
java.net.SocketException: Broken pipe
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
at org.apache.jk.common.ChannelSocket.send(ChannelSocket.java:537)
at org.apache.jk.common.JkInputStream.endMessage(JkInputStream.java:127)
at org.apache.jk.core.MsgContext.action(MsgContext.java:305)
at org.apache.coyote.Response.action(Response.java:183)
at org.apache.coyote.Response.finish(Response.java:305)
at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:205)
at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:283)
at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:773)
at
org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:703)
at
org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:895)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Thread.java:595)
application.log:
2009-11-20 10:22:29,042 WARN [TP-Processor2]
org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/customer] -
Exception thrown whilst processing POSTed parameters
java.io.IOException
at org.apache.jk.common.JkInputStream.receive(JkInputStream.java:205)
at org.apache.jk.common.JkInputStream.doRead(JkInputStream.java:179)
at org.apache.coyote.Request.doRead(Request.java:419)
at
org.apache.catalina.connector.InputBuffer.realReadBytes(InputBuffer.java:264)
at org.apache.tomcat.util.buf.ByteChunk.substract(ByteChunk.java:403)
at org.apache.catalina.connector.InputBuffer.read(InputBuffer.java:279)
at
org.apache.catalina.connector.CoyoteInputStream.read(CoyoteInputStream.java:193)
at org.apache.catalina.connector.Request.readPostBody(Request.java:2420)
at
org.apache.catalina.connector.Request.parseParameters(Request.java:2399)
at org.apache.catalina.connector.Request.getParameter(Request.java:1005)
at
org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:353)
at
COM.customer.foo.servlets.WrappedRequest.getParameter(WrappedRequest.java:134)
at
org.apache.wicket.protocol.http.servlet.ServletWebRequest.getParameter(ServletWebRequest.java:105)
at
org.apache.wicket.protocol.http.request.WebRequestCodingStrategy.decode(WebRequestCodingStrategy.java:198)
at org.apache.wicket.Request.getRequestParameters(Request.java:171)
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1233)
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1353)
at org.apache.wicket.RequestCycle.request(RequestCycle.java:493)
at
org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:355)
at
org.apache.wicket.protocol.http.WicketServlet.doPost(WicketServlet.java:145)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
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
COM.customer.foo.servlets.AdaptiveEncodingFilter.doFilter(AdaptiveEncodingFilter.java:54)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at
COM.customer.foo.servlets.PerformanceMonitorFilter.doFilter(PerformanceMonitorFilter.java:60)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:548)
at
org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:420)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:200)
at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:283)
at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:773)
at
org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:703)
at
org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:895)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Thread.java:595)
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