Spring + DWR : AJAX request is blocked if another request is active
-------------------------------------------------------------------
Key: CDV-614
URL: https://jira.terracotta.org/jira//browse/CDV-614
Project: Community Development
Issue Type: Bug
Affects Versions: 2.5.1, 2.5.0
Reporter: Bob Robinson
Assignee: Issue Review Board
Attachments: tc-config-nospring.xml, tc-config-spring.xml, tctester.war
[Posted to JIRA by request from the Forums]
If one Http request to a Spring controller is active and running, other
requests (such as AJAX requests) are blocked until the first request completes.
The example that started it: We have a Spring app that allows the upload of a
file in a FORM POST with input type=file. The files might be large, in the
200-250MB range. We want to have a progress meter that shows the percent
complete of the upload that is updated via AJAX (using DWR).
Running standalone under Tomcat, this application works as expected. The
progress meter moves smoothly between 0 and 100% complete. Under Terracotta,
the percent does not update until the file is completely uploaded. The
suspicion is that the Spring dispatch servlet is locking the session somehow,
and isn't allowing the DWR request to complete until the first request is done.
Flow:
1. FORM POST to a file upload controller in Spring
2. AJAX progress % is shown every second in the browser until #1 is 100%
3. FORM POST (file upload) completes.
Terracotta fails at #2, while standalone Tomcat does not.
I've attached a simplified test application that shows the problem. Running
standalone, the clock in the page updates consistently. Running under TC (both
2.5.0 and 2.5.1), the clock stops after you hit the "Upload File" button, and
resumes when the file is uploaded (upload is simulated with Thread.sleep). Log
files belong are from the test application, showing the 10 second gap between
AJAX updates, instead of the expected 1 sec gap. Test app can be referenced
with [server:port]/tctester/index.html
[Here is where the post starts]
2008-02-10 13:03:39,671 [http-8080-Processor3] INFO
com.terracottatech.dso.runtime - Named lock [54138000CE95493621DF] acquired
with level WRITE (2)
at com.terracotta.session.util.Lock.getWriteLock(Lock.java:36)
at
com.terracotta.session.util.DefaultSessionId.getWriteLock(DefaultSessionId.java:5
at com.terracotta.session.SessionDataStore.find(SessionDataStore.java:83)
at
com.terracotta.session.TerracottaSessionManager.getSessionIfExists(TerracottaSessionManager.java:346)
at
com.terracotta.session.SessionRequest.getTerracottaSession(SessionRequest.java:10
at com.terracotta.session.SessionRequest.getSession(SessionRequest.java:72)
at
org.springframework.web.context.request.ServletRequestAttributes.<init>(ServletRequestAttributes.java:81)
at
org.springframework.web.context.request.RequestContextListener.requestInitialized(RequestContextListener.java:63)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:167)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at com.tc.tomcat55.session.SessionValve55.tcInvoke(SessionValve55.java:63)
at com.tc.tomcat55.session.SessionValve55.invoke(SessionValve55.java:50)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:14
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:595)
[Here is the next AJAX call lock, 10 secs later instead of the 1 sec expected]
2008-02-10 13:03:49,703 [http-8080-Processor4] INFO
com.terracottatech.dso.runtime - Named lock [54138000CE95493621DF] acquired
with level WRITE (2)
at com.terracotta.session.util.Lock.getWriteLock(Lock.java:36)
at
com.terracotta.session.util.DefaultSessionId.getWriteLock(DefaultSessionId.java:5
at com.terracotta.session.SessionDataStore.find(SessionDataStore.java:83)
at
com.terracotta.session.TerracottaSessionManager.getSessionIfExists(TerracottaSessionManager.java:346)
at
com.terracotta.session.SessionRequest.getTerracottaSession(SessionRequest.java:10
at com.terracotta.session.SessionRequest.getSession(SessionRequest.java:72)
at
org.springframework.web.context.request.ServletRequestAttributes.<init>(ServletRequestAttributes.java:81)
at
org.springframework.web.context.request.RequestContextListener.requestInitialized(RequestContextListener.java:63)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:167)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at com.tc.tomcat55.session.SessionValve55.tcInvoke(SessionValve55.java:63)
at com.tc.tomcat55.session.SessionValve55.invoke(SessionValve55.java:50)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:14
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:595)
--
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators:
https://jira.terracotta.org/jira//secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira
_______________________________________________
tc-dev mailing list
[email protected]
http://lists.terracotta.org/mailman/listinfo/tc-dev
