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+#!/bin/bash
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# A simple wrapper script around hadoop which enables the use of qfs easily.
+# Using the hadoop command with qfs requires users to specify overrides for
+# various parameters (e.g. fs.defaultFS) which can become cumbersome to do on
+# the command line every time. The goal here is to provide a clean user
+# experience in using hadoop and qfs.
+
+export JAVA_LIBRARY_PATH=/usr/lib/qfs
+
+QFS_OPTS=" -Dfs.qfs.impl=com.quantcast.qfs.hadoop.QuantcastFileSystem"
+QFS_OPTS="$QFS_OPTS -Dfs.defaultFS=qfs://<%= scope['qfs::common::metaserver_host'] %>:<%= scope['qfs::common::metaserver_client_port'] %>"
+QFS_OPTS="$QFS_OPTS -Dfs.qfs.metaServerHost=<%= scope['qfs::common::metaserver_host'] %>"
+QFS_OPTS="$QFS_OPTS -Dfs.qfs.metaServerPort=<%= scope['qfs::common::metaserver_port'] %>"
+
+usage() {
+  echo "
+usage: $0 <options>
+  $0 is a simple wrapper around the standard hadoop command that allows for an
+  easy interface with qfs. A subset of the standard hadoop commands are
+  supported (where it makes sense). For all other commands, use the hadoop
+  command directly.
+
+  Commands:
+     fs                             query the qfs filesystem
+     jar <jar> <main class>         submit a job to hadoop that uses qfs
+                                        Note: the main class is required
+     distcp <srcurl> <desturl>      copy file or directories recursively
+                                        Note: supports copy into qfs from hdfs
+  "
+  exit 1
+}
+
+if [ $# == 0 ]; then
+    usage
+fi
+
+COMMAND=$1
+shift
+
+case $COMMAND in
+    # usage flags
+    --help|-h)
+        usage
+        ;;
+    fs|distcp)
+        hadoop $COMMAND $QFS_OPTS "$@"
+        ;;
+    jar)
+        if [ $# -lt 2 ]; then
+            echo "$COMMAND: jar file and main class are required"
+            usage
+        fi
+
+        JAR_FILE=$1
+        MAIN_CLASS=$2
+        shift 2
+        hadoop $COMMAND $JAR_FILE $MAIN_CLASS $QFS_OPTS "$@"
+        ;;
+    *)
+        echo "$COMMAND: unsupported -- try using the hadoop command directly"
+        usage
+        ;;
+esac