@Override
public String getSeeds() {
Set<Entity> seeds = getConfig(CassandraNode.INITIAL_SEEDS);
if (seeds == null) {
log.warn(
"No seeds available when requested for " + this,
new Throwable("source of no Cassandra seeds when requested"));
return null;
}
String snitchName = getConfig(CassandraNode.ENDPOINT_SNITCH_NAME);
MutableSet<String> seedsHostnames = MutableSet.of();
for (Entity entity : seeds) {
// tried removing ourselves if there are other nodes, but that is a BAD idea!
// blows up with a "java.lang.RuntimeException: No other nodes seen!"
if (snitchName.equals("Ec2MultiRegionSnitch") || snitchName.contains("MultiCloudSnitch")) {
// http://www.datastax.com/documentation/cassandra/2.0/mobile/cassandra/architecture/architectureSnitchEC2MultiRegion_c.html
// says the seeds should be public IPs.
seedsHostnames.add(entity.getAttribute(CassandraNode.ADDRESS));
} else {
String sensorName = getConfig(BROADCAST_ADDRESS_SENSOR);
if (Strings.isNonBlank(sensorName)) {
seedsHostnames.add(entity.getAttribute(Sensors.newStringSensor(sensorName)));
} else {
Maybe<String> optionalSeedHostname = Machines.findSubnetOrPublicHostname(entity);
if (optionalSeedHostname.isPresent()) {
String seedHostname = optionalSeedHostname.get();
seedsHostnames.add(seedHostname);
} else {
log.warn(
"In node {}, seed hostname missing for {}; not including in seeds list",
this,
entity);
}
}
}
}
String result = Strings.join(seedsHostnames, ",");
log.info("Seeds for {}: {}", this, result);
return result;
}
