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yarn-beginners-examples

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Yarn example source code accompanying wikibooks "Beginning Hadoop Programming" by Jaehwa Jung

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yarn-beginners-examples
=======================

## Build ##
```
mvn clean install
cp target/yarn-examples-1.0-SNAPSHOT.jar  $HADOOP_HOME/share/hadoop/yarn/lib/
```

## Usage ##
```
cd $HADOOP_HOME
hadoop jar share/hadoop/yarn/lib/yarn-examples-1.0-SNAPSHOT.jar com.wikibooks.hadoop.yarn.examples.MyClient

usage: Client
 -appname <arg>                                 Application Name. Default
                                                value - HelloYarn
 -container_memory <arg>                        Amount of memory in MB to
                                                be requested to run the
                                                shell command
 -container_vcores <arg>                        Amount of virtual cores to
                                                be requested to run the
                                                shell command
 -help                                          Print usage
 -jar <arg>                                     Jar file containing the
                                                application master
 -master_memory <arg>                           Amount of memory in MB to
                                                be requested to run the
                                                application master
 -master_vcores <arg>                           Amount of virtual cores to
                                                be requested to run the
                                                application master
 -num_containers <arg>                          No. of containers on which
                                                the shell command needs to
                                                be executed
 -priority <arg>                                Application Priority.
                                                Default 0
 -queue <arg>                                   RM Queue in which this
                                                application is to be
                                                submitted
 -timeout <arg>                                 Application timeout in
                                                milliseconds
```

## Example ##
```
cd $HADOOP_HOME
$HADOOP_HOME/bin/yarn jar share/hadoop/yarn/lib/yarn-examples-1.0-SNAPSHOT.jar com.wikibooks.hadoop.yarn.examples.MyClient -jar share/hadoop/yarn/lib/yarn-examples-1.0-SNAPSHOT.jar -num_containers=1
```

## Etc ##

If you run the MyClient, you will find a error log in container stderr file as follow

```
INFO impl.AMRMClientAsyncImpl: Interrupted while waiting for queue
java.lang.InterruptedException
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.reportInterruptAfterWait(AbstractQueuedSynchronizer.java:1961)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1996)
	at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:399)
	at org.apache.hadoop.yarn.client.api.async.impl.AMRMClientAsyncImpl$CallbackHandlerThread.run(AMRMClientAsyncImpl.java:275)
```

Don't worry about it, above log is a unnecessary log which is a bug for hadoop.
See YARN-1022: https://issues.apache.org/jira/browse/YARN-1022

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