https://issues.apache.org/bugzilla/show_bug.cgi?id=53061
Bug #: 53061
Summary: tomcat asynchronous invocation problem
Product: Tomcat 7
Version: 7.0.25
Platform: Other
OS/Version: Linux
Status: NEW
Severity: major
Priority: P2
Component: Catalina
AssignedTo: [email protected]
ReportedBy: [email protected]
Classification: Unclassified
Created attachment 28581
--> https://issues.apache.org/bugzilla/attachment.cgi?id=28581
a simple test reproducing the problem
We encountered a problem during asynchronous operations (tomcat7 with servlet
3).
Description:
One client continuously sends post requests to the server. On the server side
for each request created AsyncContext with timeout 20 seconds:
AsyncContext asyncContext = req.startAsync(req, resp);
asyncContext.setTimeout(20000);
As expected after approximately 20 sec the requests are completed. Then another
client also begins to send requests to the server but in this case they are
explicitly completed after 500 milliseconds. Something like this:
AsyncContext asyncContext = req.startAsync(req, resp);
asyncContext.setTimeout(20000);
try {
Thread.sleep(500);
} catch (Exception e) {
}
asyncContext.complete();
The problem is that after running the second client all requests that are
waiting for timeout (from the first client) are stuck and not released
(onTimeout method of AsyncEvent is not called) until the second client stops
sending requests.
It looks like the problem occurs on Linux but not on Windows.
I attached a simple test that may help to reproduce this issue. The following
servlet accepts URL parameter “complete”.
When “complete=1” the request will be completed after 500ms.
Otherwise the request will wait till timeout (20 seconds).
Run client that periodically sends requests to /servlet?complete=0. (I have
tested it with 10 parallel threads that run in a loop)
Then run another client that periodically sends requests to /servlet?complete=1
(This client can use only a single thread)
See that the first client does not receive any responses while the second
client is running.
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