public GossipingPropertyFileSnitch(int refreshPeriodInSeconds) throws ConfigurationException {
snitchHelperReference = new AtomicReference<ReconnectableSnitchHelper>();
reloadConfiguration();
try {
psnitch = new PropertyFileSnitch();
logger.info("Loaded {} for compatibility", PropertyFileSnitch.SNITCH_PROPERTIES_FILENAME);
} catch (ConfigurationException e) {
logger.info(
"Unable to load {}; compatibility mode disabled",
PropertyFileSnitch.SNITCH_PROPERTIES_FILENAME);
}
try {
Utils.resourceToFile(SnitchProperties.RACKDC_PROPERTY_FILENAME);
Runnable runnable =
new WrappedRunnable() {
@Override
protected void runMayThrow() throws ConfigurationException {
reloadConfiguration();
}
};
ResourceWatcher.watch(
SnitchProperties.RACKDC_PROPERTY_FILENAME, runnable, refreshPeriodInSeconds * 1000);
} catch (ConfigurationException ex) {
logger.error(
"{} found, but does not look like a plain file. Will not watch it for changes",
SnitchProperties.RACKDC_PROPERTY_FILENAME);
}
}
public FailureDetector() {
// Register this instance with JMX
try {
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
mbs.registerMBean(this, new ObjectName(Utils.getJmxObjectName("FailureDetector")));
} catch (Exception e) {
throw new RuntimeException(e);
}
}
@Override
public boolean isAlive(InetAddress ep) {
if (ep.equals(Utils.getBroadcastAddress())) return true;
EndpointState epState = Gossiper.instance.getEndpointStateForEndpoint(ep);
// we could assert not-null, but having isAlive fail screws a node over so badly that
// it's worth being defensive here so minor bugs don't cause disproportionate
// badness. (See lealone-1463 for an example).
if (epState == null) logger.error("unknown endpoint {}", ep);
return epState != null && epState.isAlive();
}
@Override
public void gossiperStarting() {
super.gossiperStarting();
Gossiper.instance.addLocalApplicationState(
ApplicationState.INTERNAL_IP,
StorageService.VALUE_FACTORY.internalIP(Utils.getLocalAddress().getHostAddress()));
reloadGossiperState();
gossipStarted = true;
}
/**
* Return the rack for which an endpoint resides in
*
* @param endpoint the endpoint to process
* @return string of rack
*/
@Override
public String getRack(InetAddress endpoint) {
if (endpoint.equals(Utils.getBroadcastAddress())) return myRack;
EndpointState epState = Gossiper.instance.getEndpointStateForEndpoint(endpoint);
if (epState == null || epState.getApplicationState(ApplicationState.RACK) == null) {
if (psnitch == null) {
if (savedEndpoints == null) savedEndpoints = ClusterMetaData.loadDcRackInfo();
if (savedEndpoints.containsKey(endpoint)) return savedEndpoints.get(endpoint).get("rack");
return DEFAULT_RACK;
} else return psnitch.getRack(endpoint);
}
return epState.getApplicationState(ApplicationState.RACK).value;
}