[maven-release-plugin] prepare release kylin-3.0.0-alpha2
diff --git a/assembly/pom.xml b/assembly/pom.xml
index 539202b..5ebf1ad 100644
--- a/assembly/pom.xml
+++ b/assembly/pom.xml
@@ -26,7 +26,7 @@
     <parent>
         <artifactId>kylin</artifactId>
         <groupId>org.apache.kylin</groupId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <properties>
diff --git a/cache/pom.xml b/cache/pom.xml
index 373b21d..b890c65 100644
--- a/cache/pom.xml
+++ b/cache/pom.xml
@@ -26,7 +26,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <dependencies>
diff --git a/core-common/pom.xml b/core-common/pom.xml
index cc0d55d..72498e3 100644
--- a/core-common/pom.xml
+++ b/core-common/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <dependencies>
diff --git a/core-cube/pom.xml b/core-cube/pom.xml
index dc40072..1220d4c 100644
--- a/core-cube/pom.xml
+++ b/core-cube/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <dependencies>
diff --git a/core-dictionary/pom.xml b/core-dictionary/pom.xml
index 06be88c..68fbe82 100644
--- a/core-dictionary/pom.xml
+++ b/core-dictionary/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <dependencies>
diff --git a/core-job/pom.xml b/core-job/pom.xml
index b5db25d..c99eb3e 100644
--- a/core-job/pom.xml
+++ b/core-job/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <dependencies>
diff --git a/core-metadata/pom.xml b/core-metadata/pom.xml
index 8666d2d..024a969 100644
--- a/core-metadata/pom.xml
+++ b/core-metadata/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <dependencies>
diff --git a/core-metrics/pom.xml b/core-metrics/pom.xml
index 76b5286..832766f 100644
--- a/core-metrics/pom.xml
+++ b/core-metrics/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <artifactId>kylin</artifactId>
         <groupId>org.apache.kylin</groupId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <dependencies>
diff --git a/core-storage/pom.xml b/core-storage/pom.xml
index 06233fe..a69d565 100644
--- a/core-storage/pom.xml
+++ b/core-storage/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <dependencies>
diff --git a/datasource-sdk/pom.xml b/datasource-sdk/pom.xml
index 7a4d469..fad665a 100644
--- a/datasource-sdk/pom.xml
+++ b/datasource-sdk/pom.xml
@@ -26,7 +26,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <dependencies>
diff --git a/engine-mr/pom.xml b/engine-mr/pom.xml
index 0b185b1..df1d23d 100644
--- a/engine-mr/pom.xml
+++ b/engine-mr/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <dependencies>
diff --git a/engine-spark/pom.xml b/engine-spark/pom.xml
index 5c88001..24be7ec 100644
--- a/engine-spark/pom.xml
+++ b/engine-spark/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <dependencies>
diff --git a/jdbc/pom.xml b/jdbc/pom.xml
index 255092e..cae665d 100644
--- a/jdbc/pom.xml
+++ b/jdbc/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <properties>
diff --git a/kylin-it/pom.xml b/kylin-it/pom.xml
index ed18408..120b7c7 100644
--- a/kylin-it/pom.xml
+++ b/kylin-it/pom.xml
@@ -29,7 +29,7 @@
     <parent>
         <artifactId>kylin</artifactId>
         <groupId>org.apache.kylin</groupId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <properties>
diff --git a/metrics-reporter-hive/pom.xml b/metrics-reporter-hive/pom.xml
index 0c79050..5560985 100644
--- a/metrics-reporter-hive/pom.xml
+++ b/metrics-reporter-hive/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <artifactId>kylin</artifactId>
         <groupId>org.apache.kylin</groupId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <dependencies>
diff --git a/metrics-reporter-kafka/pom.xml b/metrics-reporter-kafka/pom.xml
index 5f16ec3..6419ed9 100644
--- a/metrics-reporter-kafka/pom.xml
+++ b/metrics-reporter-kafka/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <artifactId>kylin</artifactId>
         <groupId>org.apache.kylin</groupId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <dependencies>
diff --git a/pom.xml b/pom.xml
index bf1b460..cf845c4f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -30,7 +30,7 @@
   <groupId>org.apache.kylin</groupId>
   <artifactId>kylin</artifactId>
   <packaging>pom</packaging>
-  <version>3.0.0-SNAPSHOT</version>
+  <version>3.0.0-alpha2</version>
 
   <name>Apache Kylin</name>
   <url>http://kylin.apache.org</url>
@@ -229,7 +229,7 @@
     <developerConnection>scm:git:ssh://git@github.com/apache/kylin.git
     </developerConnection>
     <url>https://github.com/apache/kylin</url>
-    <tag>HEAD</tag>
+    <tag>kylin-3.0.0-alpha2</tag>
   </scm>
 
   <dependencyManagement>
diff --git a/query/pom.xml b/query/pom.xml
index c8ce8ba..1e28b74 100644
--- a/query/pom.xml
+++ b/query/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <dependencies>
diff --git a/server-base/pom.xml b/server-base/pom.xml
index 2b5cd74..f64c9d3 100644
--- a/server-base/pom.xml
+++ b/server-base/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <dependencies>
diff --git a/server/pom.xml b/server/pom.xml
index ad68daa..7df77e2 100644
--- a/server/pom.xml
+++ b/server/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <dependencies>
diff --git a/source-hive/pom.xml b/source-hive/pom.xml
index e242f0a..0c581a8 100644
--- a/source-hive/pom.xml
+++ b/source-hive/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <dependencies>
diff --git a/source-jdbc/pom.xml b/source-jdbc/pom.xml
index 52b316b..3a5dcb6 100644
--- a/source-jdbc/pom.xml
+++ b/source-jdbc/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <dependencies>
diff --git a/source-kafka/pom.xml b/source-kafka/pom.xml
index 3d93f8c..c3186f1 100644
--- a/source-kafka/pom.xml
+++ b/source-kafka/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <dependencies>
diff --git a/storage-hbase/pom.xml b/storage-hbase/pom.xml
index 87e2adc..a4f0d04 100644
--- a/storage-hbase/pom.xml
+++ b/storage-hbase/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <properties>
diff --git a/storage-stream/pom.xml b/storage-stream/pom.xml
index 9697b29..bb021d1 100644
--- a/storage-stream/pom.xml
+++ b/storage-stream/pom.xml
@@ -21,7 +21,7 @@
     <parent>
         <artifactId>kylin</artifactId>
         <groupId>org.apache.kylin</groupId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>kylin-storage-stream</artifactId>
diff --git a/stream-coordinator/pom.xml b/stream-coordinator/pom.xml
index bc9df74..4c714b5 100644
--- a/stream-coordinator/pom.xml
+++ b/stream-coordinator/pom.xml
@@ -21,7 +21,7 @@
     <parent>
         <artifactId>kylin</artifactId>
         <groupId>org.apache.kylin</groupId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>kylin-stream-coordinator</artifactId>
diff --git a/stream-core/pom.xml b/stream-core/pom.xml
index e6fa05c..04f8fb9 100644
--- a/stream-core/pom.xml
+++ b/stream-core/pom.xml
@@ -21,7 +21,7 @@
     <parent>
         <artifactId>kylin</artifactId>
         <groupId>org.apache.kylin</groupId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>kylin-stream-core</artifactId>
diff --git a/stream-receiver/pom.xml b/stream-receiver/pom.xml
index cb8144b..c4b611d 100644
--- a/stream-receiver/pom.xml
+++ b/stream-receiver/pom.xml
@@ -21,7 +21,7 @@
     <parent>
         <artifactId>kylin</artifactId>
         <groupId>org.apache.kylin</groupId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>kylin-stream-receiver</artifactId>
diff --git a/stream-source-kafka/pom.xml b/stream-source-kafka/pom.xml
index a77ef7f..92502c3 100644
--- a/stream-source-kafka/pom.xml
+++ b/stream-source-kafka/pom.xml
@@ -21,7 +21,7 @@
     <parent>
         <artifactId>kylin</artifactId>
         <groupId>org.apache.kylin</groupId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>kylin-stream-source-kafka</artifactId>
diff --git a/tomcat-ext/pom.xml b/tomcat-ext/pom.xml
index 75c7da9..60732c9 100644
--- a/tomcat-ext/pom.xml
+++ b/tomcat-ext/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <groupId>org.apache.kylin</groupId>
         <artifactId>kylin</artifactId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <dependencies>
diff --git a/tool-assembly/pom.xml b/tool-assembly/pom.xml
index 62dd153..e9c6de9 100644
--- a/tool-assembly/pom.xml
+++ b/tool-assembly/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <artifactId>kylin</artifactId>
         <groupId>org.apache.kylin</groupId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <properties>
diff --git a/tool/pom.xml b/tool/pom.xml
index 77974c7..b149d7c 100644
--- a/tool/pom.xml
+++ b/tool/pom.xml
@@ -28,7 +28,7 @@
     <parent>
         <artifactId>kylin</artifactId>
         <groupId>org.apache.kylin</groupId>
-        <version>3.0.0-SNAPSHOT</version>
+        <version>3.0.0-alpha2</version>
     </parent>
 
     <properties>