How to use

startStabilityTask

method

in

org.jgroups.protocols.pbcast.STABLE

/**
 Schedules a stability message to be mcast after a random number of milliseconds (range [1-stability_delay] secs).
 The reason for waiting a random amount of time is that, in the worst case, all members receive a
 STABLE_GOSSIP message from the last outstanding member at the same time and would therefore mcast the
 STABILITY message at the same time too. To avoid this, each member waits random N msecs. If, before N
 elapses, some other member sent the STABILITY message, we just cancel our own message. If, during
 waiting for N msecs to send STABILITY message S1, another STABILITY message S2 is to be sent, we just discard S2.
 @param tmp A copy of the stability digest, so we don't need to copy it again
 */
protected void sendStabilityMessage(Digest tmp, final ViewId view_id) {
  if(send_stable_msgs_to_coord_only || stability_delay <= 1)
    _sendStabilityMessage(tmp, view_id);
  else {
    // give other members a chance to mcast STABILITY message. if we receive STABILITY by the end of our random
    // sleep, we will not send the STABILITY msg. this prevents that all mbrs mcast a STABILITY msg at the same time
    startStabilityTask(tmp, view_id, Util.random(stability_delay));
  }
}

/**
 Schedules a stability message to be mcast after a random number of milliseconds (range 1-5 secs).
 The reason for waiting a random amount of time is that, in the worst case, all members receive a
 STABLE_GOSSIP message from the last outstanding member at the same time and would therefore mcast the
 STABILITY message at the same time too. To avoid this, each member waits random N msecs. If, before N
 elapses, some other member sent the STABILITY message, we just cancel our own message. If, during
 waiting for N msecs to send STABILITY message S1, another STABILITY message S2 is to be sent, we just
 discard S2.
 @param tmp A copy of te stability digest, so we don't need to copy it again
 */
private void sendStabilityMessage(Digest tmp) {
  long delay;
  if(suspended) {
    if(log.isTraceEnabled())
      log.trace("STABILITY message will not be sent as I'm suspended");
    return;
  }
  // give other members a chance to mcast STABILITY message. if we receive STABILITY by the end of
  // our random sleep, we will not send the STABILITY msg. this prevents that all mbrs mcast a
  // STABILITY msg at the same time
  delay=Util.random(stability_delay);
  if(log.isTraceEnabled()) log.trace("sending stability msg (in " + delay + " ms) " + tmp.printHighestDeliveredSeqnos() +
  " (copy=" + tmp.hashCode() + ")");
  startStabilityTask(tmp, delay);
}

/**
 Schedules a stability message to be mcast after a random number of milliseconds (range [1-stability_delay] secs).
 The reason for waiting a random amount of time is that, in the worst case, all members receive a
 STABLE_GOSSIP message from the last outstanding member at the same time and would therefore mcast the
 STABILITY message at the same time too. To avoid this, each member waits random N msecs. If, before N
 elapses, some other member sent the STABILITY message, we just cancel our own message. If, during
 waiting for N msecs to send STABILITY message S1, another STABILITY message S2 is to be sent, we just discard S2.
 @param tmp A copy of the stability digest, so we don't need to copy it again
 */
protected void sendStabilityMessage(Digest tmp, final ViewId view_id) {
  if(send_stable_msgs_to_coord_only || stability_delay <= 1)
    _sendStabilityMessage(tmp, view_id);
  else {
    // give other members a chance to mcast STABILITY message. if we receive STABILITY by the end of our random
    // sleep, we will not send the STABILITY msg. this prevents that all mbrs mcast a STABILITY msg at the same time
    startStabilityTask(tmp, view_id, Util.random(stability_delay));
  }
}