YARN-1573. ZK store should use a private password for root-node-acls. (kasha)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1560595 13f79535-47bb-0310-9956-ffa450edef68

hadoop-yarn-project/CHANGES.txt

@@ -216,6 +216,9 @@ Release 2.4.0 - UNRELEASED
     YARN-1623. Include queue name in RegisterApplicationMasterResponse (Sandy
     Ryza)
 
+    YARN-1573. ZK store should use a private password for root-node-acls. 
+    (kasha).
+
   OPTIMIZATIONS
 
   BUG FIXES

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/resources/yarn-default.xml

@@ -357,7 +357,7 @@
 
       By default, when this property is not set, we use the ACLs from
       yarn.resourcemanager.zk-acl for shared admin access and
-      rm-address:cluster-timestamp for username-based exclusive create-delete
+      rm-address:random-number for username-based exclusive create-delete
       access.
 
       This property allows users to set ACLs of their choice instead of using

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/recovery/ZKRMStateStore.java

@@ -24,6 +24,7 @@ import java.io.DataInputStream;
 import java.io.DataOutputStream;
 import java.io.IOException;
 import java.security.NoSuchAlgorithmException;
+import java.security.SecureRandom;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
@@ -47,7 +48,6 @@ import org.apache.hadoop.yarn.proto.YarnServerResourceManagerServiceProtos.Appli
 import org.apache.hadoop.yarn.proto.YarnServerResourceManagerServiceProtos.ApplicationStateDataProto;
 import org.apache.hadoop.yarn.proto.YarnServerResourceManagerServiceProtos.RMStateVersionProto;
 import org.apache.hadoop.yarn.security.client.RMDelegationTokenIdentifier;
-import org.apache.hadoop.yarn.server.resourcemanager.ResourceManager;
 import org.apache.hadoop.yarn.server.resourcemanager.recovery.records.RMStateVersion;
 import org.apache.hadoop.yarn.server.resourcemanager.recovery.records.impl.pb.ApplicationAttemptStateDataPBImpl;
 import org.apache.hadoop.yarn.server.resourcemanager.recovery.records.impl.pb.ApplicationStateDataPBImpl;
@@ -74,6 +74,7 @@ import com.google.common.annotations.VisibleForTesting;
 public class ZKRMStateStore extends RMStateStore {
 
   public static final Log LOG = LogFactory.getLog(ZKRMStateStore.class);
+  private final SecureRandom random = new SecureRandom();
 
   protected static final String ROOT_ZNODE_NAME = "ZKRMStateRoot";
   protected static final RMStateVersion CURRENT_VERSION_INFO = RMStateVersion
@@ -136,6 +137,8 @@ public class ZKRMStateStore extends RMStateStore {
   private String fencingNodePath;
   private Op createFencingNodePathOp;
   private Op deleteFencingNodePathOp;
+  private String zkRootNodeUsername;
+  private final String zkRootNodePassword = Long.toString(random.nextLong());
 
   @VisibleForTesting
   List<ACL> zkRootNodeAcl;
@@ -145,9 +148,6 @@ public class ZKRMStateStore extends RMStateStore {
   private final String zkRootNodeAuthScheme =
       new DigestAuthenticationProvider().getScheme();
 
-  private String zkRootNodeUsername;
-  private String zkRootNodePassword;
-
   /**
    * Given the {@link Configuration} and {@link ACL}s used (zkAcl) for
    * ZooKeeper access, construct the {@link ACL}s for the store's root node.
@@ -172,7 +172,6 @@ public class ZKRMStateStore extends RMStateStore {
     zkRootNodeUsername = HAUtil.getConfValueForRMInstance(
         YarnConfiguration.RM_ADDRESS,
         YarnConfiguration.DEFAULT_RM_ADDRESS, conf);
-    zkRootNodePassword = Long.toString(ResourceManager.getClusterTimeStamp());
     Id rmId = new Id(zkRootNodeAuthScheme,
         DigestAuthenticationProvider.generateDigest(
             zkRootNodeUsername + ":" + zkRootNodePassword));