[maven-release-plugin] prepare release release-0.8.1
diff --git a/client/pom.xml b/client/pom.xml
index 83ad796..f552b76 100644
--- a/client/pom.xml
+++ b/client/pom.xml
@@ -24,7 +24,7 @@
     <parent>
         <groupId>org.apache.iotdb</groupId>
         <artifactId>iotdb-parent</artifactId>
-        <version>0.8.1-SNAPSHOT</version>
+        <version>0.8.1</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
     <artifactId>iotdb-client</artifactId>
diff --git a/distribution/pom.xml b/distribution/pom.xml
index 538081e..f57bd11 100644
--- a/distribution/pom.xml
+++ b/distribution/pom.xml
@@ -24,7 +24,7 @@
     <parent>
         <groupId>org.apache.iotdb</groupId>
         <artifactId>iotdb-parent</artifactId>
-        <version>0.8.1-SNAPSHOT</version>
+        <version>0.8.1</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
     <artifactId>iotdb-distribution</artifactId>
diff --git a/example/kafka/pom.xml b/example/kafka/pom.xml
index 24d1786..9980237 100644
--- a/example/kafka/pom.xml
+++ b/example/kafka/pom.xml
@@ -29,7 +29,7 @@
     <parent>
         <groupId>org.apache.iotdb</groupId>
         <artifactId>iotdb-examples</artifactId>
-        <version>0.8.1-SNAPSHOT</version>
+        <version>0.8.1</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
     <artifactId>kafka-example</artifactId>
diff --git a/example/pom.xml b/example/pom.xml
index 0904721..7968687 100644
--- a/example/pom.xml
+++ b/example/pom.xml
@@ -24,7 +24,7 @@
     <parent>
         <groupId>org.apache.iotdb</groupId>
         <artifactId>iotdb-parent</artifactId>
-        <version>0.8.1-SNAPSHOT</version>
+        <version>0.8.1</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
     <packaging>pom</packaging>
diff --git a/example/rocketmq/pom.xml b/example/rocketmq/pom.xml
index 58d9627..9400010 100644
--- a/example/rocketmq/pom.xml
+++ b/example/rocketmq/pom.xml
@@ -24,7 +24,7 @@
     <parent>
         <groupId>org.apache.iotdb</groupId>
         <artifactId>iotdb-examples</artifactId>
-        <version>0.8.1-SNAPSHOT</version>
+        <version>0.8.1</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
     <artifactId>rocketmq-example</artifactId>
diff --git a/grafana/pom.xml b/grafana/pom.xml
index 29f8b94..620a4eb 100644
--- a/grafana/pom.xml
+++ b/grafana/pom.xml
@@ -24,7 +24,7 @@
     <parent>
         <groupId>org.apache.iotdb</groupId>
         <artifactId>iotdb-parent</artifactId>
-        <version>0.8.1-SNAPSHOT</version>
+        <version>0.8.1</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
     <!--parent>
diff --git a/jdbc/pom.xml b/jdbc/pom.xml
index 98d6000..299210f 100644
--- a/jdbc/pom.xml
+++ b/jdbc/pom.xml
@@ -24,7 +24,7 @@
     <parent>
         <groupId>org.apache.iotdb</groupId>
         <artifactId>iotdb-parent</artifactId>
-        <version>0.8.1-SNAPSHOT</version>
+        <version>0.8.1</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
     <artifactId>iotdb-jdbc</artifactId>
diff --git a/pom.xml b/pom.xml
index d90c917..af98931 100644
--- a/pom.xml
+++ b/pom.xml
@@ -28,7 +28,7 @@
     </parent>
     <groupId>org.apache.iotdb</groupId>
     <artifactId>iotdb-parent</artifactId>
-    <version>0.8.1-SNAPSHOT</version>
+    <version>0.8.1</version>
     <packaging>pom</packaging>
     <name>Apache IoTDB (incubating) Project Parent POM</name>
     <description>This is the top level project that builds, packages the tsfile, iotdb engine, jdbc, and integration libs.</description>
@@ -42,7 +42,7 @@
         <connection>scm:git:ssh://git@github.com/apache/incubator-iotdb.git</connection>
         <developerConnection>scm:git:ssh://git@github.com/apache/incubator-iotdb.git</developerConnection>
         <url>ssh://git@github.com:apache/incubator-iotdb.git</url>
-        <tag>release/0.8.1</tag>
+        <tag>release-0.8.1</tag>
     </scm>
     <!-- Properties Management -->
     <properties>
diff --git a/server/pom.xml b/server/pom.xml
index 706c7f9..dcf4e57 100644
--- a/server/pom.xml
+++ b/server/pom.xml
@@ -24,7 +24,7 @@
     <parent>
         <groupId>org.apache.iotdb</groupId>
         <artifactId>iotdb-parent</artifactId>
-        <version>0.8.1-SNAPSHOT</version>
+        <version>0.8.1</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
     <artifactId>iotdb-server</artifactId>
diff --git a/service-rpc/pom.xml b/service-rpc/pom.xml
index 40511b8..2987543 100644
--- a/service-rpc/pom.xml
+++ b/service-rpc/pom.xml
@@ -24,7 +24,7 @@
     <parent>
         <groupId>org.apache.iotdb</groupId>
         <artifactId>iotdb-parent</artifactId>
-        <version>0.8.1-SNAPSHOT</version>
+        <version>0.8.1</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
     <artifactId>service-rpc</artifactId>
diff --git a/spark-tsfile/pom.xml b/spark-tsfile/pom.xml
index db2fab4..fc10c87 100644
--- a/spark-tsfile/pom.xml
+++ b/spark-tsfile/pom.xml
@@ -24,7 +24,7 @@
     <parent>
         <groupId>org.apache.iotdb</groupId>
         <artifactId>iotdb-parent</artifactId>
-        <version>0.8.1-SNAPSHOT</version>
+        <version>0.8.1</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
     <artifactId>spark-tsfile</artifactId>
diff --git a/tsfile/pom.xml b/tsfile/pom.xml
index 2da67cc..e4eb912 100644
--- a/tsfile/pom.xml
+++ b/tsfile/pom.xml
@@ -24,7 +24,7 @@
     <parent>
         <groupId>org.apache.iotdb</groupId>
         <artifactId>iotdb-parent</artifactId>
-        <version>0.8.1-SNAPSHOT</version>
+        <version>0.8.1</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
     <artifactId>tsfile</artifactId>