org.springframework.data.hadoop.test.support.compat
Class MiniMRClusterCompat

java.lang.Object
  org.springframework.data.hadoop.test.support.compat.MiniMRClusterCompat

public abstract class MiniMRClusterCompat
extends java.lang.Object

Compatibility class accessing minimr classes at runtime without knowing implementations during the compile time.

Usually minimr clusters are constructed via MiniMRClientClusterFactory which have same methods for hadoop 1.x and 2.x. Hadoop have this to easy testing for both versions. However at least hadoop 1.x distribution from a Cloudera(chd3, chd4) don't have this factory method for we need to resolve underlying cluster classes at runtime. Effectively these legacy classes cannot be resolved at compile time because Hadoop 2.x is based on Yarn and thus have different minimr cluster implementations.

Author:

Janne Valkealahti

Constructor Summary

MiniMRClusterCompat()

Method Summary

static org.apache.hadoop.conf.Configuration	getConfiguration(java.lang.Object mrClusterObject) Gets the Configuration from a cluster.
static java.lang.Object	instantiateCluster(java.lang.Class<?> caller, int nodes, org.apache.hadoop.conf.Configuration configuration, org.apache.hadoop.fs.FileSystem fileSystem, java.lang.ClassLoader classLoader) Instantiates a minimrcluster.
static void	stopCluster(java.lang.Object mrClusterObject) Finds and calls lifecycle stop method for given cluster via reflection.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MiniMRClusterCompat

public MiniMRClusterCompat()

Method Detail

instantiateCluster

public static java.lang.Object instantiateCluster(java.lang.Class<?> caller,
                                                  int nodes,
                                                  org.apache.hadoop.conf.Configuration configuration,
                                                  org.apache.hadoop.fs.FileSystem fileSystem,
                                                  java.lang.ClassLoader classLoader)

Instantiates a minimrcluster.

Parameters:

caller - the one who called this method

nodes - number of nodes

configuration - passed configuration

fileSystem - hdfs filesystem

classLoader - the class loader

Returns:

the cluster object

stopCluster

public static void stopCluster(java.lang.Object mrClusterObject)

Finds and calls lifecycle stop method for given cluster via reflection.

Parameters:

mrClusterObject - the Cluster Object

getConfiguration

public static org.apache.hadoop.conf.Configuration getConfiguration(java.lang.Object mrClusterObject)

Gets the Configuration from a cluster.

Parameters:

mrClusterObject - the Cluster Object

Returns:

the cluster Configuration