HDFS-3400. DNs should be able start with jsvc even if security is disabled. Contributed by Aaron T. Myers

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1337017 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -451,6 +451,9 @@ Release 2.0.0 - UNRELEASED
 
     HDFS-3401. Cleanup DatanodeDescriptor creation in the tests. (eli)
 
+    HDFS-3400. DNs should be able start with jsvc even if security is disabled.
+    (atm via eli)
+
   OPTIMIZATIONS
 
     HDFS-3024. Improve performance of stringification in addStoredBlock (todd)

hadoop-hdfs-project/hadoop-hdfs/src/main/bin/hdfs

@@ -56,6 +56,7 @@ shift
 
 # Determine if we're starting a secure datanode, and if so, redefine appropriate variables
 if [ "$COMMAND" == "datanode" ] && [ "$EUID" -eq 0 ] && [ -n "$HADOOP_SECURE_DN_USER" ]; then
+  if [ -n "$JSVC_HOME" ]; then
     if [ -n "$HADOOP_SECURE_DN_PID_DIR" ]; then
       HADOOP_PID_DIR=$HADOOP_SECURE_DN_PID_DIR
     fi
@@ -66,6 +67,10 @@ if [ "$COMMAND" == "datanode" ] && [ "$EUID" -eq 0 ] && [ -n "$HADOOP_SECURE_DN_
    
     HADOOP_IDENT_STRING=$HADOOP_SECURE_DN_USER
     starting_secure_dn="true"
+  else
+    echo "It looks like you're trying to start a secure DN, but \$JSVC_HOME"\
+      "isn't set. Falling back to starting insecure DN."
+  fi
 fi
 
 if [ "$COMMAND" = "namenode" ] ; then
@@ -130,7 +135,7 @@ if [ "$starting_secure_dn" = "true" ]; then
 
   JSVC=$JSVC_HOME/jsvc
   if [ ! -f $JSVC ]; then
-    echo "JSVC_HOME is not set correctly so jsvc can not be found. Jsvc is required to run secure datanodes. "
+    echo "JSVC_HOME is not set correctly so jsvc cannot be found. Jsvc is required to run secure datanodes. "
     echo "Please download and install jsvc from http://archive.apache.org/dist/commons/daemon/binaries/ "\
       "and set JSVC_HOME to the directory containing the jsvc binary."
     exit

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

@@ -29,6 +29,7 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants;
 import org.apache.hadoop.http.HttpServer;
+import org.apache.hadoop.security.UserGroupInformation;
 import org.mortbay.jetty.nio.SelectChannelConnector;
 
 /**
@@ -60,10 +61,7 @@ public class SecureDataNodeStarter implements Daemon {
   @Override
   public void init(DaemonContext context) throws Exception {
     System.err.println("Initializing secure datanode resources");
-    // We should only start up a secure datanode in a Kerberos-secured cluster
+    Configuration conf = new Configuration();
-    Configuration conf = new Configuration(); // Skip UGI method to not log in
-    if(!conf.get(HADOOP_SECURITY_AUTHENTICATION).equals("kerberos"))
-      throw new RuntimeException("Cannot start secure datanode in unsecure cluster");
     
     // Stash command-line arguments for regular datanode
     args = context.getArguments();
@@ -98,7 +96,8 @@ public class SecureDataNodeStarter implements Daemon {
     System.err.println("Successfully obtained privileged resources (streaming port = "
         + ss + " ) (http listener port = " + listener.getConnection() +")");
     
-    if (ss.getLocalPort() >= 1023 || listener.getPort() >= 1023) {
+    if ((ss.getLocalPort() >= 1023 || listener.getPort() >= 1023) &&
+        UserGroupInformation.isSecurityEnabled()) {
       throw new RuntimeException("Cannot start secure datanode with unprivileged ports");
     }
     System.err.println("Opened streaming server at " + streamingAddr);