low load: ERROR ClientHandler Unexpected HTTP protocol error: Request already
submitted
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Key: SYNAPSE-452
URL: https://issues.apache.org/jira/browse/SYNAPSE-452
Project: Synapse
Issue Type: Bug
Affects Versions: 1.2
Environment: found on wso2-esb 1.7.1 (having synapse 1.2) running on
debian. XEN vm's running on Intel HW.
The back-end is a spring webapp (using cxf, using commons-httpclient)
We run the backend on the same VM as the ESB.
Reporter: harm verhagen
I'm seen http connection related exceptions when under _very_ low load.
what do I do:
I proxy a soap interface of a backend, using wso2.
I issue a soap command using www.soapui.org.
After 1,2,3 commands (issue manually) the bus gives internal excpetions.
what do I get:
from ESB logging.
2008-09-16 15:33:29,157 [127.0.0.1-vloeki_v01] [HttpServerWorker-9] ERROR
ClientHandler Unexpected HTTP protocol error: Request already submitted
org.apache.http.HttpException: Request already submitted
at
org.apache.http.impl.nio.DefaultNHttpClientConnection.submitRequest(DefaultNHttpClientConnection.java:203)
reference:
more details & logs at:
http://wso2.org/mailarchive/esb-java-user/2008-September/000812.html
workaround:
When not running the ESB and the backend on the same machine, (or better said,
when routing the traffic between ESB and backend trough an other machine). The
problem went away..
see http://wso2.org/mailarchive/esb-java-user/2008-September/000840.html.
This obviously isn't a real fix.
This issue might be related to:
https://issues.apache.org/jira/browse/SYNAPSE-344
https://issues.apache.org/jira/browse/SYNAPSE-341
https://issues.apache.org/jira/browse/HTTPCORE-170
however, I'm seeing this under very low loads, very reproducable. (I _never_
can more that 3 commands in 4 seconds without getting this error)
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