private Address findMasterWithMulticast() {
try {
final String ip = System.getProperty("join.ip");
if (ip == null) {
JoinInfo joinInfo = node.createJoinInfo();
for (; node.isActive() && currentTryCount.incrementAndGet() <= maxTryCount.get(); ) {
joinInfo.setTryCount(currentTryCount.get());
node.multicastService.send(joinInfo);
if (node.getMasterAddress() == null) {
//noinspection BusyWait
Thread.sleep(10);
} else {
return node.getMasterAddress();
}
}
} else {
logger.log(Level.FINEST, "RETURNING join.ip");
return new Address(ip, config.getNetworkConfig().getPort());
}
} catch (final Exception e) {
if (logger != null) {
logger.log(Level.WARNING, e.getMessage(), e);
}
} finally {
this.currentTryCount.set(0);
}
return null;
}
public void onReceivedJoinInfo(JoinInfo joinInfo) {
if (joinInfo.getTryCount() > this.currentTryCount.get() + 20) {
int timeoutSeconds =
(config.getNetworkConfig().getJoin().getMulticastConfig().getMulticastTimeoutSeconds()
+ 4)
* 100;
this.maxTryCount.set(timeoutSeconds);
}
}
public void searchForOtherClusters(SplitBrainHandler splitBrainHandler) {
final BlockingQueue q = new LinkedBlockingQueue();
MulticastListener listener =
new MulticastListener() {
public void onMessage(Object msg) {
systemLogService.logJoin("MulticastListener onMessage " + msg);
if (msg != null && msg instanceof JoinInfo) {
JoinInfo joinInfo = (JoinInfo) msg;
if (node.address != null && !node.address.equals(joinInfo.address)) {
q.offer(msg);
}
}
}
};
node.multicastService.addMulticastListener(listener);
node.multicastService.send(node.createJoinInfo());
systemLogService.logJoin("Sent multicast join request");
try {
JoinInfo joinInfo = (JoinInfo) q.poll(3, TimeUnit.SECONDS);
if (joinInfo != null) {
if (joinInfo.getMemberCount() == 1) {
// if the other cluster has just single member, that may be a newly starting node
// instead of a split node.
// Wait 2 times 'WAIT_SECONDS_BEFORE_JOIN' seconds before processing merge JoinInfo.
Thread.sleep(node.groupProperties.WAIT_SECONDS_BEFORE_JOIN.getInteger() * 1000L * 2);
}
if (shouldMerge(joinInfo)) {
logger.log(
Level.WARNING, node.address + " is merging [multicast] to " + joinInfo.address);
targetAddress = joinInfo.address;
node.clusterManager.sendClusterMergeToOthers(targetAddress);
splitBrainHandler.restart();
return;
}
}
} catch (InterruptedException ignored) {
} catch (Exception e) {
if (logger != null) {
logger.log(Level.WARNING, e.getMessage(), e);
}
} finally {
node.multicastService.removeMulticastListener(listener);
}
}