change memcached key timeout

@@ -9,6 +9,8 @@
 const zookeeper = require('node-zookeeper-client');
 const _ = require('lodash');
 
+const ONE_YEAR = 60 * 60 * 24 * 365;
+
 const getter = (client, path, memory, cache) => {
     client.getData(
         path,
@@ -26,7 +28,7 @@ const getter = (client, path, memory, cache) => {
             memory && _.set(memory, keys, data.toString('utf8') === 'true' ? true : false);
             if (cache) {
                 try {
-                    cache.set('zookeeper:' + path, data.toString('utf8'));
+                    cache.set('zookeeper:' + path, data.toString('utf8'), ONE_YEAR);
                     console.log('cache %s data: %s', 'zookeeper:' + path, data.toString('utf8'));
                 } catch (e) {
                 }