public CuratorFramework getZkClient() {
        if (zkClient != null) {
            return zkClient;
        }
        zkRootClient = CuratorFrameworkFactory.newClient(getZkAddr(), new ExponentialBackoffRetry(1000, 10));
        zkRootClient.start();
        zkClient = zkRootClient.usingNamespace(getZkRoot());
        return zkClient;
    }
The path where realtime segments declare.
<pre>
    .../rt/table/tableA/host0/seg0_0 ... segN_0
    .../rt/table/tableA/host1/seg0_1 ... segN_1
</pre>
indexr-server/src/main/java/io/indexr/server/IndexRConfig.java