Re: [undertow-dev] Websocket connections and IO thread affinity
We recently changed xnio to balance connections by default using a strategy similar to the
new SO_REUSEPORT facility in the Linux kernel (3.3.3 or later). In the short future, we
will be switching to the native facility when accessible in the JDK NIO implementation.
Older versions had a feature called balancing tokens that you could use to balance
connections fairly, but it had to be especially configured.
On Jun 16, 2016, at 1:00 PM, peter royal
<peter.royal(a)pobox.com> wrote:
(I believe the following is true... please correct me if not!)
I have an application which heavily utilizes web sockets. It is an
internal application which uses a small number of connections with
reasonable load on each.
When a new connection is received by Undertow, there is an
at-connection-time assignment of an XNIO IO Thread to the connection.
This is causing uneven load on my IO threads, due to chance.
I'm increasing the number of IO threads as a temporary fix, but it might
be useful to be able to either migrate a long-lived connection to
another IO thread (harder) or do better load balancing amongst IO
threads. For the latter, if Undertow was able to provide a strategy for
picking a thread in NioXnioWorker.getIoThread(hashCode), it could try
and pick a thread that had fewer connections assigned to it.
Has anyone else run into this problem? Would a fix be accepted?
-pete
--
(peter.royal|osi)(a)pobox.com - http://fotap.org/~osi
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