/** * 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); } } }