MINA only allocates ports the application tells it to. Nothing is automatic.
On Fri, May 17, 2019 at 10:23 AM Emmanuel Lécharny <[email protected]> wrote: > > On 17/05/2019 16:04, Phil Hudson wrote: > > > > Hi All, > > > > I have 2 questions about the way NioSocketAcceptor allocates and uses > > ports. > > > > Background > > > > We are using a 3^rd party product (QuickFix/J) for client/server > > communication, which in turn uses > > > > MINA for network communication. For server side communication, > > QuickFix/J is instantiating a > > > > NioSocketAcceptor for listening on a specified port. We recently > > noticed an issue where a large number > > > > of additional ports are also being allocated when a NioSocketAcceptor > > is instantiated. We seem to > > > > see around 10 ‘pairs’ of ports allocated (20 total) with each > > instantiation. As you can see in the sample > > > > below, they seem to be in pairs, where they talk to each other. ?? > > > > Proto Local Address Foreign Address State > PID > > > > TCP 127.0.0.1:55686 MYSYS:55687 ESTABLISHED 24976 > > > > TCP 127.0.0.1:55687 MYSYS:55686 ESTABLISHED 24976 > > > > TCP 127.0.0.1:55688 MYSYS:55689 ESTABLISHED 24976 > > > > TCP 127.0.0.1:55689 MYSYS:55688 ESTABLISHED 24976 > > > > … > > > > Note that the actual port being listened on is a different port > > altogether… example: port 6073 > > > > I have searched for why this is occurring, but can’t find any > > documentation on it. > > > > Questions > > > > 1) Why do 20 ports get allocated when a NioSocketAcceptor is > instantiated? > > > > 1a) What is it using these ports for? > > > > No idea. It all depends on the application using MINA. > > > 2) Is there a way to control this? (or control the range it > > allocates from?) > > > > You have to ask the QuickFix/J fellows. > > MINA is just a framework, it does what you tell it to do... > > Quickly browsing their documentation, it seems they allow users to set a > failover mechanism, by which they start more than one acceptor: > > https://www.quickfixj.org/usermanual/2.1.0/usage/acceptor_failover.html > > but that might be unrelated. Just ask QuickFix/J people, they are the > ones who know :-) > > > And thanks them for using MINA ;-) > > >
