svn merge -c 1373090 FIXES: HDFS-3718. Datanode won't shutdown because of runaway DataBlockScanner thread (Kihwal Lee via daryn)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1373098 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -95,6 +95,9 @@ Release 0.23.3 - UNRELEASED
 
     HDFS-3597. SNN fails to start after DFS upgrade. (Andy Isaacson via todd)
 
+    HDFS-3718. Datanode won't shutdown because of runaway DataBlockScanner
+    thread (Kihwal Lee via daryn)
+
 Release 0.23.2 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java

@@ -1112,6 +1112,7 @@ public class DataNode extends Configured
       }
     }
     
+    this.shouldRun = false;
     shutdownPeriodicScanners();
     
     if (infoServer != null) {
@@ -1125,7 +1126,6 @@ public class DataNode extends Configured
       ipcServer.stop();
     }
     
-    this.shouldRun = false;
     if (dataXceiverServer != null) {
       ((DataXceiverServer) this.dataXceiverServer.getRunnable()).kill();
       this.dataXceiverServer.interrupt();