~~ Licensed 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. See accompanying LICENSE file.

  ---
  Hadoop MapReduce Next Generation ${project.version} - CLI MiniCluster.
  ---
  ---
  ${maven.build.timestamp}

Hadoop MapReduce Next Generation - CLI MiniCluster.

  \[ {{{./index.html}Go Back}} \]

%{toc|section=1|fromDepth=0}

* {Purpose}

  Using the CLI MiniCluster, users can simply start and stop a single-node
  Hadoop cluster with a single command, and without the need to set any
  environment variables or manage configuration files. The CLI MiniCluster
  starts both a <<<YARN>>>/<<<MapReduce>>> & <<<HDFS>>> clusters.

  This is useful for cases where users want to quickly experiment with a real
  Hadoop cluster or test non-Java programs that rely on significant Hadoop
  functionality.

* {Hadoop Tarball}

  You should be able to obtain the Hadoop tarball from the release. Also, you
  can directly create a tarball from the source:

+---+
$ mvn clean install -DskipTests
$ mvn package -Pdist -Dtar -DskipTests -Dmaven.javadoc.skip
+---+
  <<NOTE:>> You will need protoc 2.5.0 installed.

  The tarball should be available in <<<hadoop-dist/target/>>> directory. 

* {Running the MiniCluster}

  From inside the root directory of the extracted tarball, you can start the CLI
  MiniCluster using the following command:

+---+
$ bin/hadoop jar ./share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-${project.version}-tests.jar minicluster -rmport RM_PORT -jhsport JHS_PORT
+---+

  In the example command above, <<<RM_PORT>>> and <<<JHS_PORT>>> should be
  replaced by the user's choice of these port numbers. If not specified, random
  free ports will be used.

  There are a number of command line arguments that the users can use to control
  which services to start, and to pass other configuration properties.
  The available command line arguments:

+---+
$ -D <property=value>    Options to pass into configuration object
$ -datanodes <arg>       How many datanodes to start (default 1)
$ -format                Format the DFS (default false)
$ -help                  Prints option help.
$ -jhsport <arg>         JobHistoryServer port (default 0--we choose)
$ -namenode <arg>        URL of the namenode (default is either the DFS
$                        cluster or a temporary dir)
$ -nnport <arg>          NameNode port (default 0--we choose)
$ -nodemanagers <arg>    How many nodemanagers to start (default 1)
$ -nodfs                 Don't start a mini DFS cluster
$ -nomr                  Don't start a mini MR cluster
$ -rmport <arg>          ResourceManager port (default 0--we choose)
$ -writeConfig <path>    Save configuration to this XML file.
$ -writeDetails <path>   Write basic information to this JSON file.
+---+

  To display this full list of available arguments, the user can pass the
  <<<-help>>> argument to the above command.