2:12 a.m.
Unicast messages to unused port result in infinitely retransmission of message
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Key: JGRP-357
URL: http://jira.jboss.com/jira/browse/JGRP-357
Project: JGroups
Issue Type: Bug
Affects Versions: 2.4
Reporter: Vincent Hartsteen
Assigned To: Bela Ban
In JGroups 2.4 (but probably this also happens in previous versions, did not verify this)
we noticed that it is possible to send a message to a host:port that is not part of the
group. This member might have been a member of the group but does not need to have been.
This results in the retransmission of the message. However this retransmission never seems
to end. The attached program demonstrates this.
Use the properties file to assign a host-address and port the program will send messages
to.
Properties file:
===========
flood.target.address : 10.220.242.33
flood.target.port : 2715
flood.topic : flood.the.network
flood.stack : UDP(mcast_addr=228.1.2.123;mcast_port=19302;ip_ttl=32;loopback=false;\
mcast_recv_buf_size=1000000;max_bundle_size=64000;max_bundle_timeout=100;use_incoming_packet_handler=false;\
use_outgoing_packet_handler=true;ucast_send_buf_size=1000000;ip_ttl=32;enable_bundling=true/):\
PING(timeout=6000;num_initial_members=8;down_thread=false):\
MERGE2(max_interval=300000;min_interval=60000;down_thread=false):\
FD(timeout=30000;max_tries=5;shun=true):\
pbcast.NAKACK(gc_lag=300;retransmit_timeout=3000,30000,60000,180000;use_mcast_xmit=false;max_xmit_size=8192):\
UNICAST(timeout=3000,30000,60000,180000):\
pbcast.STABLE(desired_avg_gossip=300000;stability_delay=30000;max_bytes=65536;down_thread=false):\
pbcast.GMS(join_timeout=10000;join_retry_timeout=5000;shun=true;print_local_addr=true;down_thread=false):\
FC(max_credits=64000;min_credits=8000;down_thread=false):\
FRAG2(frag_size=8000;down_thread=false;up_thread=false):\
COMPRESS(down_thread=false;min_size=256;compression_level=9;up_thread=true):\
pbcast.STATE_TRANSFER(down_thread=false;up_thread=false)
Program:
=======
public class Flooder implements MembershipListener, RequestHandler, RspCollector {
private static Log log = LogFactory.getLog(Flooder.class);
private static int counter = 0;
private Channel channel = null;
private MessageDispatcher dispatcher = null;
private Timer floodTimer = null;
private InetAddress targetAddr;
private int targetPort;
private String topic;
private String stack;
public Flooder() throws IOException, ChannelException {
Properties properties = new Properties();
InputStream in =
ClassLoader.getSystemClassLoader().getResourceAsStream("flooder.properties");
properties.load(in);
in.close();
targetAddr =
InetAddress.getByName(properties.getProperty("flood.target.address").trim());
targetPort =
Integer.parseInt(properties.getProperty("flood.target.port"));
topic = properties.getProperty("flood.topic");
stack = properties.getProperty("flood.stack");
initialize();
}
public void initialize() throws ChannelException {
channel = new JChannel(stack);
channel.setOpt(Channel.BLOCK, Boolean.TRUE);
channel.setOpt(Channel.GET_STATE_EVENTS, Boolean.TRUE);
channel.setOpt(Channel.AUTO_RECONNECT, Boolean.TRUE);
channel.setOpt(Channel.AUTO_GETSTATE, Boolean.TRUE);
channel.connect(topic);
dispatcher = new MessageDispatcher(channel, null, this, this);
log.trace("Connected to topic " + topic + " w/ stack: " +
((JChannel)channel).getProtocolStack().printProtocolSpec(true));
}
public void startFlooding() {
if (floodTimer != null) floodTimer.cancel();
floodTimer = new Timer();
floodTimer.schedule(new TimerTask() {
@Override
public void run() {
Address address = new IpAddress(targetAddr, targetPort);
Message msg = new Message(address, null, ("Flooooooooood#" +
++counter + "#").getBytes());
Vector<Address> victor = new Vector<Address>(1);
victor.add(address);
dispatcher.castMessage(victor, System.currentTimeMillis(), msg,
Flooder.this);
log.trace("Sent Flooding message #" + counter + " to "
+ address + " @ " + new Date());
}
}, 1000, 10000);
}
public void block() {
log.trace("BLOCK");
}
public void suspect(Address addr) {
log.trace("SUSPECT: " + addr);
}
public void viewAccepted(View v) {
log.trace("VIEW ACCEPTED: " + v);
}
public Object handle(Message msg) {
log.trace("MESSAGE RECEIVED: " + msg);
return "HANDLED";
}
public void receiveResponse(Message m) {
log.trace("RECEIVE RESPONSE: " + m + " hdr=" +
m.getHeaders());
}
public void viewChange(View v) {
log.trace("VIEW CHANGE: " + v);
}
public static void main(String[] args) {
try {
Flooder flooder = new Flooder();
flooder.startFlooding();
} catch (Exception ex) {
log.error("Exception occurred: ", ex);
}
}
}
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