diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 6e4aec1..132181a 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -219,7 +219,7 @@
       <workItem from="1580626297484" duration="35811000" />
       <workItem from="1581061282899" duration="70334000" />
       <workItem from="1581749148787" duration="1225000" />
-      <workItem from="1581847341168" duration="1705000" />
+      <workItem from="1581847341168" duration="2266000" />
     </task>
     <task id="LOCAL-00001" summary="add q5/q7/q172">
       <created>1580045439607</created>
@@ -368,7 +368,14 @@
       <option name="project" value="LOCAL" />
       <updated>1581851491537</updated>
     </task>
-    <option name="localTasksCounter" value="22" />
+    <task id="LOCAL-00022" summary="update Rocket.md">
+      <created>1581855774959</created>
+      <option name="number" value="00022" />
+      <option name="presentableId" value="LOCAL-00022" />
+      <option name="project" value="LOCAL" />
+      <updated>1581855774959</updated>
+    </task>
+    <option name="localTasksCounter" value="23" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -447,10 +454,10 @@
       <screen x="0" y="0" width="1440" height="900" />
     </state>
     <state x="533" y="166" key="#com.intellij.ide.util.MemberChooser/0.0.1440.900@0.0.1440.900" timestamp="1578548165321" />
-    <state x="303" y="50" key="CommitChangelistDialog2" timestamp="1581851490927">
+    <state x="303" y="50" key="CommitChangelistDialog2" timestamp="1581855774677">
       <screen x="0" y="0" width="1440" height="900" />
     </state>
-    <state x="303" y="50" key="CommitChangelistDialog2/0.0.1440.900@0.0.1440.900" timestamp="1581851490927" />
+    <state x="303" y="50" key="CommitChangelistDialog2/0.0.1440.900@0.0.1440.900" timestamp="1581855774677" />
     <state x="144" y="78" width="1152" height="720" key="DiffContextDialog" timestamp="1581744794181">
       <screen x="0" y="23" width="1440" height="797" />
     </state>
@@ -500,10 +507,10 @@
       <screen x="0" y="0" width="1440" height="900" />
     </state>
     <state x="221" y="63" key="SettingsEditor/0.0.1440.900@0.0.1440.900" timestamp="1581061096545" />
-    <state x="320" y="190" key="Vcs.Push.Dialog.v2" timestamp="1581851493032">
+    <state x="320" y="190" key="Vcs.Push.Dialog.v2" timestamp="1581855776604">
       <screen x="0" y="0" width="1440" height="900" />
     </state>
-    <state x="320" y="190" key="Vcs.Push.Dialog.v2/0.0.1440.900@0.0.1440.900" timestamp="1581851493032" />
+    <state x="320" y="190" key="Vcs.Push.Dialog.v2/0.0.1440.900@0.0.1440.900" timestamp="1581855776604" />
     <state x="100" y="100" width="1240" height="700" key="com.intellij.history.integration.ui.views.DirectoryHistoryDialog" timestamp="1581744794182">
       <screen x="0" y="23" width="1440" height="797" />
     </state>
diff --git a/Rocket.md b/Rocket.md
index 9dbf13d..0b1c921 100644
--- a/Rocket.md
+++ b/Rocket.md
@@ -357,6 +357,11 @@ Kafka最初考虑的问题是，customer应该从brokes拉取消息还是brokers
 4. 批量发送：Kafka允许进行批量发送消息，先将消息缓存在内存中，然后一次请求批量发送出去
 5. 数据压缩：Kafka还支持对消息集合进行压缩，Producer可以通过GZIP或Snappy格式对消息集合进行压缩
 
+### Kafka判断一个节点还活着的两个条件
+
+1. 节点必须可以维护和 ZooKeeper 的连接，Zookeeper 通过心跳机制检查每个节点的连接
+2. 如果节点是个 follower,他必须能及时的同步 leader 的写操作，延时不能太久
+
 ## Dubbo
 
 ### Dubbo的容错机制
@@ -368,6 +373,10 @@ Kafka最初考虑的问题是，customer应该从brokes拉取消息还是brokers
 5. 并行调用多个服务器，只要一个成功即返回。通常用于实时性要求较高的读操作，但需要浪费更多服务资源。可通过 forks="2" 来设置最大并行数。
 6. 广播调用所有提供者，逐个调用，任意一台报错则报错。通常用于通知所有提供者更新缓存或日志等本地资源信息
 
+### Dubbo注册中心挂了还可以继续通信么
+
+可以，因为刚开始初始化的时候，消费者会将提供者的地址等信息拉取到本地缓存，所以注册中心挂了可以继续通信。
+
 ## 计算机网路
 
 ### Get和Post区别