synchronized void rollCurrentKey() { if (!leaderElector.isMaster()) { LOG.info("Skipping rollCurrentKey() because not running as master."); return; } long now = EnvironmentEdgeManager.currentTime(); AuthenticationKey prev = currentKey; AuthenticationKey newKey = new AuthenticationKey( ++idSeq, Long.MAX_VALUE, // don't allow to expire until it's replaced by a new key generateSecret()); allKeys.put(newKey.getKeyId(), newKey); currentKey = newKey; zkWatcher.addKeyToZK(newKey); lastKeyUpdate = now; if (prev != null) { // make sure previous key is still stored prev.setExpiration(now + tokenMaxLifetime); allKeys.put(prev.getKeyId(), prev); zkWatcher.updateKeyInZK(prev); } }