/**
* Place the host:port advertisement for the Monitor's Log4j listener in ZooKeeper
*
* @param conf configuration for the instance
* @param instanceId instanceId for the instance
* @param hostAddress Address that monitor process is bound to
*/
public static void startLogListener(
AccumuloConfiguration conf, String instanceId, String hostAddress) {
try {
SocketServer server = new SocketServer(conf.getPort(Property.MONITOR_LOG4J_PORT));
// getLocalPort will return the actual ephemeral port used when '0' was provided.
String logForwardingAddr = hostAddress + ":" + server.getLocalPort();
log.debug("Setting monitor log4j log-forwarding address to: " + logForwardingAddr);
final String path = ZooUtil.getRoot(instanceId) + Constants.ZMONITOR_LOG4J_ADDR;
final ZooReaderWriter zoo = ZooReaderWriter.getInstance();
// Delete before we try to re-create in case the previous session hasn't yet expired
try {
zoo.delete(path, -1);
} catch (KeeperException e) {
// We don't care if the node is already gone
if (!KeeperException.Code.NONODE.equals(e.code())) {
throw e;
}
}
zoo.putEphemeralData(path, logForwardingAddr.getBytes(UTF_8));
new Daemon(server).start();
} catch (Throwable t) {
log.info("Unable to start/advertise Log4j listener for log-forwarding to monitor", t);
}
}
@Override
public void processResult(CuratorFramework client, CuratorEvent event) throws Exception {
if (event.getResultCode() == KeeperException.Code.NONODE.intValue()) {
createNode();
} else {
boolean isEphemeral = event.getStat().getEphemeralOwner() != 0;
if (isEphemeral != mode.isEphemeral()) {
log.warn(
"Existing node ephemeral state doesn't match requested state. Maybe the node was created outside of PersistentNode? "
+ basePath);
}
}
}