From f548ef08d0e7eb7ca682ec00948ad4ce30a216af Mon Sep 17 00:00:00 2001
From: Xargin <cao1988228@163.com>
Date: Thu, 12 Jul 2018 19:25:53 +0800
Subject: [PATCH] add todo

---
 SUMMARY.md                             | 2 +-
 ch6-cloud/ch6-02-dist-search-engine.md | 6 +++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/SUMMARY.md b/SUMMARY.md
index fbe9ca5..6c6e035 100644
--- a/SUMMARY.md
+++ b/SUMMARY.md
@@ -51,7 +51,7 @@
    * [5.11. Load-balance负载均衡](ch5-web/ch5-11-load-balance.md)
 * [第六章 分布式系统](ch6-cloud/readme.md)
    * [6.1. 云上地鼠(TODO)](ch6-cloud/ch6-01-cloud.md)
-   * [6.2. 分布式搜索引擎](ch6-cloud/ch6-02-dist-search-engine.md)
+   * [6.2. 分布式搜索引擎(Doing)](ch6-cloud/ch6-02-dist-search-engine.md)
    * [6.2. Raft协议(TODO)](ch6-cloud/ch6-02-raft.md)
    * [6.3. 分布式哈希(TODO)](ch6-cloud/ch6-03-hash.md)
    * [6.4. 分布式队列(TODO)](ch6-cloud/ch6-04-queue.md)
diff --git a/ch6-cloud/ch6-02-dist-search-engine.md b/ch6-cloud/ch6-02-dist-search-engine.md
index 1bfebf6..4c13830 100644
--- a/ch6-cloud/ch6-02-dist-search-engine.md
+++ b/ch6-cloud/ch6-02-dist-search-engine.md
@@ -271,4 +271,8 @@ SQL 的 where 部分就是 boolean expression。我们之前提到过，这种 b
 
 > github.com/cch123/elasticsql
 
-来学习具体的实现。
\ No newline at end of file
+来学习具体的实现。
+
+## 异构数据同步
+
+TODO