From a4b2cd4df2594acba97e8fbef53ea582ef6da5df Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=BD=AD=E5=8B=87=E5=8D=87=20pengys?= <8082209@qq.com>
Date: Fri, 16 Nov 2018 15:39:21 +0800
Subject: [PATCH] Make ZooKeeper Version Compatibility clear in document
 (#1916)

* ZooKeeper Version Compatibility

* Update backend-cluster.md

Reorganize words. cc @peng-yongsheng

* Update application.yml

* Update application.yml
---
 docs/en/setup/backend/backend-cluster.md                  | 8 +++++++-
 .../server-starter/src/main/assembly/application.yml      | 2 ++
 .../server-starter/src/main/resources/application.yml     | 2 ++
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/docs/en/setup/backend/backend-cluster.md b/docs/en/setup/backend/backend-cluster.md
index 8d7d00642d..5c7d4977fb 100644
--- a/docs/en/setup/backend/backend-cluster.md
+++ b/docs/en/setup/backend/backend-cluster.md
@@ -12,7 +12,13 @@ by using k8s native APIs to manage cluster.
 
 ## Zookeeper coordinator
 Zookeeper is a very common and wide used cluster coordinator. Set the **cluster** module's implementor
-to **zookeeper** in the yml to active.
+to **zookeeper** in the yml to active. 
+
+Required Zookeeper version, 3.5+
+
+Zookeeper version is required above 3.5 by Curator 4.0 lib, but actually Curator 4.0 is compatible with ZooKeeper 3.4.x.
+To make ZooKeeper 3.4.x works, please replace the ZooKeeper 3.5+ library jar in `oap-libs` folder with ZooKeeper 3.4.x library.
+
 ```yaml
 cluster:
   zookeeper:
diff --git a/oap-server/server-starter/src/main/assembly/application.yml b/oap-server/server-starter/src/main/assembly/application.yml
index c4fc5740fa..312f35673b 100644
--- a/oap-server/server-starter/src/main/assembly/application.yml
+++ b/oap-server/server-starter/src/main/assembly/application.yml
@@ -16,6 +16,8 @@
 
 cluster:
   standalone:
+  # Please check your ZooKeeper is 3.5+, However, it is also compatible with ZooKeeper 3.4.x. Replace the ZooKeeper 3.5+
+  # library in the oap-libs folder with your ZooKeeper 3.4.x libraru.
 #  zookeeper:
 #    hostPort: localhost:2181
 #    # Retry Policy
diff --git a/oap-server/server-starter/src/main/resources/application.yml b/oap-server/server-starter/src/main/resources/application.yml
index 2236cfc28e..cd57703df5 100644
--- a/oap-server/server-starter/src/main/resources/application.yml
+++ b/oap-server/server-starter/src/main/resources/application.yml
@@ -16,6 +16,8 @@
 
 cluster:
   standalone:
+   # Please check your ZooKeeper is 3.5+, However, it is also compatible with ZooKeeper 3.4.x. Replace the ZooKeeper 3.5+
+   # library the oap-libs folder with your ZooKeeper 3.4.x library.
 #  zookeeper:
 #    hostPort: localhost:2181
 #    # Retry Policy