Issue2192

We are currently using Django 1.7, Jython 2.7b3+ and django-jython 1.7.0b2 to run our server.
Commit https://github.com/jythontools/jython/commit/348b63a04e2b20ca8b91bd367b7f778d66379381
to solve issue http://bugs.jython.org/issue2094 is causing requests to hang indefinitely.

This change seems to be the root of the issue:

@@ -818,19 +881,21 @@ def connect_ex(self, addr):

     def listen(self, backlog):
         self.socket_type = SERVER_SOCKET
+        self.child_queue = ArrayBlockingQueue(backlog)
+        self.accepted_children = 1  # include the parent as well to simplify close logic

         b = ServerBootstrap()
-        self.group = NioEventLoopGroup(10, DaemonThreadFactory())
-        b.group(self.group)
+        self.parent_group = NioEventLoopGroup(2, DaemonThreadFactory("Jython-Netty-Parent-%s"))
+        self.child_group = NioEventLoopGroup(2, DaemonThreadFactory("Jython-Netty-Child-%s"))
+        b.group(self.parent_group, self.child_group)

Increasing the number of threads from 2 seemed to prevent the problem.

Thanks. I had reduced thread pool size because we have been experiencing thread leaks in some tests due to the lack of __del__ support, but that's forthcoming. Restoring to a reasonable sizing like 10 seems to be the best action for now; we can make configurable or smarter in sizing later.

Fixed as of http://hg.python.org/jython/rev/7a96264b09ab

__del__ now works in general for Jython (see #1057), although we still have the first thread in each pool hanging, but not apparently sockets.

As a consequence, I've been able to increase the thread pool count to 10. We will work on getting the final thread cleanup as well, although it most likely only impacts test code.

Also just fixed the related #2201, which was causing a separate issue in closing out thread pools