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< h1 > Hadoop: CLI MiniCluster.< / h1 >
< ul >
< li > < a href = "#Purpose" > Purpose< / a > < / li >
< li > < a href = "#Hadoop_Tarball" > Hadoop Tarball< / a > < / li >
< li > < a href = "#Running_the_MiniCluster" > Running the MiniCluster< / a > < / li > < / ul >
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< h2 > < a name = "Purpose" > < / a > Purpose< / h2 >
< p > 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 < code > YARN< / code > /< code > MapReduce< / code > & < code > HDFS< / code > clusters.< / p >
< p > 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.< / p > < / section > < section >
< h2 > < a name = "Hadoop_Tarball" > < / a > Hadoop Tarball< / h2 >
< p > You should be able to obtain the Hadoop tarball from the release. Also, you can directly create a tarball from the source:< / p >
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< pre > $ mvn clean install -DskipTests
$ mvn package -Pdist -Dtar -DskipTests -Dmaven.javadoc.skip
< / pre > < / div > < / div >
< p > < b > NOTE:< / b > You will need < a class = "externalLink" href = "http://code.google.com/p/protobuf/" > protoc 2.5.0< / a > installed.< / p >
< p > The tarball should be available in < code > hadoop-dist/target/< / code > directory.< / p > < / section > < section >
< h2 > < a name = "Running_the_MiniCluster" > < / a > Running the MiniCluster< / h2 >
< p > From inside the root directory of the extracted tarball, you can start the CLI MiniCluster using the following command:< / p >
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< pre > $ bin/mapred minicluster -rmport RM_PORT -jhsport JHS_PORT
< / pre > < / div > < / div >
< p > In the example command above, < code > RM_PORT< / code > and < code > JHS_PORT< / code > should be replaced by the user’ s choice of these port numbers. If not specified, random free ports will be used.< / p >
< p > 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:< / p >
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< pre > $ -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)
$ -nnhttpport < arg> NameNode HTTP 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.
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< p > To display this full list of available arguments, the user can pass the < code > -help< / code > argument to the above command.< / p > < / section >
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