After little more testing, I have concluded that it is not MINA issue. To open a connection to target server, I use below code with MINA:
====================================== ExecutorService ioExecutor = Executors.newCachedThreadPool(); IoConnector ioConnector = new SocketConnector(Runtime.getRuntime() .availableProcessors() + 1, ioExecutor); SocketAddress socketAddress = new InetSocketAddress(hostAddressString, hostPortNumber); ConnectFuture future = ioConnector.connect(socketAddress); ====================================== The InetSocketAddress class internally does a DNS lookup and maintains a cache of the IP addresses. But it seems that there is no way to retrieve all the IP addresses associated with a host name. The method InetSocketAddress.getAddress() returns only one IP address and even though one of the IPs is unavailable, it would not cycle through the next one. I even turned off the DNS caching using Java system property "networkaddress.cache.ttl=0". Again, it is not caching issue in my opinion. Even though I want to handle it in the application code, the Java APIs does not provide me a way to know that there are multiple IP addresses for a given host. I am not sure how application developers are handling this situation. On Wed, Dec 19, 2012 at 6:14 AM, Emmanuel Lécharny <elecha...@gmail.com>wrote: > Le 12/19/12 11:15 AM, Jean-Yves Linet a écrit : > > Hi, > > Well your problem can have multiple explanations : > > Do you remove the down host IP from the DNS list ? Otherwise DNS server > > will continue to use it. > > DNS resolution can be cached somewhere. (see networkaddress.cache in Java > > properties) > > I doubt that this could be a MINA issue. > I was about to do the exact same answer. > > > > -- > Regards, > Cordialement, > Emmanuel Lécharny > www.iktek.com > >
