On Wed, Jan 20, 2010 at 11:41 AM, Christopher Schultz
<ch...@christopherschultz.net> wrote:
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> Mohit,
>
> On 1/20/2010 2:11 PM, Mohit Anchlia wrote:
>>> Server version: Apache Tomcat/6.0.18
>>>
>>> We don't any other web server in front
>
> Okay. What connector(s) are you using? I'm not sure it matters, given
> the other information you've provided.
<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="120000"
maxThreads="300"
redirectPort="8443" />
>>> Interesting. Do all responses with fewer than 2657 bytes succeed? Do all
>>> responses with more than 2656 bytes fail?
>>
>> YES
>
> Hmm.
>
>> Please post the entire stack trace of the exception.
>>
>>> SEVERE: Servlet.service() for servlet SwitchServlet threw exception
>>> java.net.SocketTimeoutException: Read timed out
>>> at java.net.SocketInputStream.socketRead0(Native Method)
>>> at java.net.SocketInputStream.read(SocketInputStream.java:129)
>>> at java.io.FilterInputStream.read(FilterInputStream.java:111)
>>> at
>>> com.wily.introscope.agent.probe.net.ManagedSocketInputStream.read(ManagedSocketInputStream.java:214)
>
> I've never see this class before. What is it? In this some kind of
> instrumentation? If so, what happens if you turn it off?
Yes it's Wily that we use to instrument to get the throughput,
response time etc.
> Another interesting thing is that this fails during a read() operation.
> So, your servlet isn't failing to send data to the client, it's failing
> to read the data in the first place.
YES that is correct.
> I'll bet that 2657 bytes is the size of your "500 error" page. Can you
> check that?
> Does your servlet usually emit fewer than 2657 bytes? That's a pretty
> small response for many HTTP requests.
Yes we don't send much data because it's just an acknwoledgment that's
parsed by home grown client application
>>> at
>>> org.apache.coyote.http11.InternalInputBuffer.fill(InternalInputBuffer.java:746)
>>> at
>>> org.apache.coyote.http11.InternalInputBuffer$InputStreamInputBuffer.doRead(InternalInputBuffer.java:776)
>>> at
>>> org.apache.coyote.http11.filters.IdentityInputFilter.doRead(IdentityInputFilter.java:116)
>>> at
>>> org.apache.coyote.http11.InternalInputBuffer.doRead(InternalInputBuffer.java:705)
>>> at org.apache.coyote.Request.doRead(Request.java:428)
>>> at
>>> org.apache.catalina.connector.InputBuffer.realReadBytes(InputBuffer.java:304)
>>> at
>>> org.apache.tomcat.util.buf.ByteChunk.substract(ByteChunk.java:405)
>>> at
>>> org.apache.catalina.connector.InputBuffer.read(InputBuffer.java:327)
>>> at
>>> org.apache.catalina.connector.CoyoteInputStream.read(CoyoteInputStream.java:162)
>>> at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:1025)
>>> at org.apache.commons.io.IOUtils.copy(IOUtils.java:999)
>>> at org.apache.commons.io.IOUtils.toByteArray(IOUtils.java:218)
>>> at
>>> com.intuit.engine.efp.efe.efileswitch.SwitchServlet.doPostOrGet(SwitchServlet.java:174)
>>> at
>>> com.intuit.engine.efp.efe.common.servlet.BaseServlet.doPost(BaseServlet.java:48)
>
> So, you're copying a byte array from the client. Where are you copying
> it to?
Copying it to byte array.
transmission = IOUtils.toByteArray(request.getInputStream())
>> Yes it always fail with desktop clients on the broadband/modem etc..
>> Basically ones that are using our GUI application.
>
> So, regular web browsers like Firefox, MSIE, Safari? When you say "GUI
> application" do you mean a web-based application, or do you have
> something else that's running on the client?
Something else which home grown application running on client
>> Is there also a timeout where connection is closed when 'n' secs
>> expire irrespecitve of if the client and server are actively talking
>> to each other.
>
> That would be the SocketTimeout itself which I don't believe is settable
> through Tomcat's <Connector> configuration. The default socket timeout
> for ServerSocket is 0 (infinity: wait forever) so it must be that this
> default is being changed somewhere along the way.
>
> It's possible that the <Connector> configurator will pass-through any
> settings onto the socket (I haven't read the code). It would be simple
> to try adding "soTimeout=60000" (that's 60 seconds) to your <Connector>
> configuration and see if that works. Check the logs after startup to see
> if there's any warning that the "soTimeout" attribute didn't match
> anything useful.
It didn't throw warning when I changed it.
> - -chris
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