Hi Oleg,
Yes, we're shutting down the client from a callback in the actual
application. The design of the program is a state machine that issues
requests and processes the responses. If there's a failure during the
process (received via the failure() callback) we terminate the state
machine and part of that process is closing the client.
We've added code, as a workaround, to spawn a temporary worker thread to
close the connection. That has worked. So if there's no solution to
the original problem, we have a way to get around this.
Thanks again,
Mark
On 1/27/2016 3:38 AM, Oleg Kalnichevski wrote:
On Tue, 2016-01-26 at 13:30 -0600, Mark Johnson wrote:
Hi Oleg,
Below is a program that reproduces the hang. It might take a couple of
runs to make this happen - it depends on what thread the callback is
generated on. If it's on the IO Dispatcher thread, we can close the
connection on that thread also and there's no problem. If the callback
comes on the pool-thread the program hangs. The stack trace of the
pool-thread when this happens looks like this:
Thread [pool-1-thread] (Suspended) <-- I paused it in the debugger
but this is where it stays
owns: SessionRequestImpl (id=44)
waiting for: Thread (id=21)
Object.wait(long)
Thread.join(long)
Thread.join()
InternalHttpAsyncClient(ClosableHttpAsyncClientBase).close()
Testprog$Callback.failed(Exception)
etc.
...
@Override
public void cancelled() {
Thread t = Thread.currentThread();
System.out.println(t.getName() + ": " + "Request cancelled");
try {
System.out.println(t.getName() + ": " + "Closing client connection");
_httpclient.close();
} catch (Exception ex) {
System.out.println(t.getName() + ": " + ex.getMessage());
}
_latch.countDown();
}
Good Lord! You are shutting down the client from a callback. Is there a
good reason for that?
Regardless I'll see if there is a way to avoid a deadlock here.
Thanks for the reproducer.
Oleg
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