SAMZA-2757 : Make Samza Compatible with Java 11

bin/grid

@@ -34,9 +34,10 @@ DEPLOY_ROOT_DIR=$BASE_DIR/deploy
 DOWNLOAD_CACHE_DIR=$HOME/.samza/download
 COMMAND=$1
 SYSTEM=$2
+YARN_VERSION="3.3.4"
 
 DOWNLOAD_KAFKA=https://archive.apache.org/dist/kafka/2.1.1/kafka_2.11-2.1.1.tgz
-DOWNLOAD_YARN=https://archive.apache.org/dist/hadoop/common/hadoop-2.9.2/hadoop-2.9.2.tar.gz
+DOWNLOAD_YARN=https://archive.apache.org/dist/hadoop/common/hadoop-$YARN_VERSION/hadoop-$YARN_VERSION.tar.gz
 DOWNLOAD_ZOOKEEPER=https://archive.apache.org/dist/zookeeper/zookeeper-3.4.14/zookeeper-3.4.14.tar.gz
 
 SERVICE_WAIT_TIMEOUT_SEC=20
@@ -52,6 +53,7 @@ bootstrap() {
   mkdir "$DEPLOY_ROOT_DIR"
   install_all
   start_all
+  echo "Visit http://localhost:8088/ for Hadoop UI"
   exit 0
 }
 
@@ -81,17 +83,20 @@ install_all_without_yarn() {
 install_samza() {
   echo "Building samza from master..."
   mkdir -p "$DEPLOY_ROOT_DIR"
+  echo "DOWNLOAD_CACHE_DIR: $DOWNLOAD_CACHE_DIR"
   if [ -d "$DOWNLOAD_CACHE_DIR/samza/.git" ]; then
+    echo "Resetting local samza to master"
     pushd "$DOWNLOAD_CACHE_DIR/samza"
     git fetch origin
     git reset --hard origin/master
   else
+    echo "Cloning samza git repo to build locally"
     mkdir -p $DOWNLOAD_CACHE_DIR
     pushd $DOWNLOAD_CACHE_DIR
     git clone https://gitbox.apache.org/repos/asf/samza.git
     cd samza
   fi
-  ./gradlew -PscalaSuffix=2.11 clean publishToMavenLocal
+  ./gradlew -PscalaSuffix=2.12 clean publishToMavenLocal
   popd
 }
 
@@ -103,7 +108,7 @@ install_zookeeper() {
 
 install_yarn() {
   mkdir -p "$DEPLOY_ROOT_DIR"
-  install yarn $DOWNLOAD_YARN hadoop-2.9.2
+  install yarn $DOWNLOAD_YARN hadoop-$YARN_VERSION
   cp "$BASE_DIR/conf/yarn-site.xml" "$DEPLOY_ROOT_DIR/yarn/etc/hadoop/yarn-site.xml"
   if [ ! -f "$HOME/.samza/conf/yarn-site.xml" ]; then
     mkdir -p "$HOME/.samza/conf"