org.apache.hadoop.mrunit

Class MapDriver<K1,V1,K2,V2>

java.lang.Object

org.apache.hadoop.mrunit.TestDriver<K2,V2,T>

org.apache.hadoop.mrunit.MapDriverBase<K1,V1,K2,V2,MapDriver<K1,V1,K2,V2>>

org.apache.hadoop.mrunit.MapDriver<K1,V1,K2,V2>

public class MapDriver<K1,V1,K2,V2>
extends MapDriverBase<K1,V1,K2,V2,MapDriver<K1,V1,K2,V2>>

Harness that allows you to test a Mapper instance. You provide the input (k, v)* pairs that should be sent to the Mapper, and outputs you expect to be sent by the Mapper to the collector for those inputs. By calling runTest(), the harness will deliver the input to the Mapper and will check its outputs against the expected results.

Field Summary

Fields

Modifier and Type	Field and Description
static org.apache.commons.logging.Log	LOG

Fields inherited from class org.apache.hadoop.mrunit.MapDriverBase

inputKey, inputs, inputVal, mapInputPath

Fields inherited from class org.apache.hadoop.mrunit.TestDriver

counterWrapper, expectedEnumCounters, expectedMultipleOutputs, expectedOutputs, expectedPathOutputs, expectedStringCounters, mos

Constructor Summary

Constructors

Constructor and Description
MapDriver()
MapDriver(org.apache.hadoop.mapred.Mapper<K1,V1,K2,V2> m)

Method Summary

Methods

Modifier and Type	Method and Description
org.apache.hadoop.mapred.Counters	getCounters()
org.apache.hadoop.mapred.Mapper<K1,V1,K2,V2>	getMapper()
static <K1,V1,K2,V2> MapDriver<K1,V1,K2,V2>	newMapDriver() Returns a new MapDriver without having to specify the generic types on the right hand side of the object create statement.
static <K1,V1,K2,V2> MapDriver<K1,V1,K2,V2>	newMapDriver(org.apache.hadoop.mapred.Mapper<K1,V1,K2,V2> mapper) Returns a new MapDriver without having to specify the generic types on the right hand side of the object create statement.
List<Pair<K2,V2>>	run() Runs the test but returns the result set instead of validating it (ignores any addOutput(), etc calls made before this)
void	setCounters(org.apache.hadoop.mapred.Counters ctrs) Sets the counters object to use for this test.
void	setMapper(org.apache.hadoop.mapred.Mapper<K1,V1,K2,V2> m) Set the Mapper instance to use with this test driver
String	toString()
MapDriver<K1,V1,K2,V2>	withCounters(org.apache.hadoop.mapred.Counters ctrs) Sets the counters to use and returns self for fluent style
MapDriver<K1,V1,K2,V2>	withMapper(org.apache.hadoop.mapred.Mapper<K1,V1,K2,V2> m) Sets the Mapper instance to use and returns self for fluent style
MapDriver<K1,V1,K2,V2>	withOutputFormat(Class<? extends org.apache.hadoop.mapred.OutputFormat> outputFormatClass, Class<? extends org.apache.hadoop.mapred.InputFormat> inputFormatClass) Configure Mapper to output with a real OutputFormat.

Methods inherited from class org.apache.hadoop.mrunit.MapDriverBase

addAll, addInput, addInput, clearInput, getInputKey, getInputValue, getMapInputPath, preRunChecks, printPreTestDebugLog, setInput, setInput, setInputFromString, setInputKey, setInputValue, setMapInputPath, withAll, withInput, withInput, withInputFromString, withInputKey, withInputValue, withMapInputPath

Methods inherited from class org.apache.hadoop.mrunit.TestDriver

addAllOutput, addCacheArchive, addCacheArchive, addCacheFile, addCacheFile, addMultiOutput, addMultiOutput, addOutput, addOutput, addOutputFromString, cleanupDistributedCache, copy, copyPair, driverReused, formatPairList, formatValueList, getConfiguration, getExpectedEnumCounters, getExpectedOutputs, getExpectedStringCounters, getKeyComparator, getOutputSerializationConfiguration, getValueComparator, initDistributedCache, parseCommaDelimitedList, parseTabbedPair, resetExpectedCounters, resetOutput, run, runTest, runTest, setCacheArchives, setCacheFiles, setConfiguration, setKeyComparator, setOutputSerializationConfiguration, setUsedOnceStatus, setValueComparator, thisAsTestDriver, validate, validate, validate, validateOutputList, withAllOutput, withCacheArchive, withCacheArchive, withCacheFile, withCacheFile, withConfiguration, withCounter, withCounter, withMultiOutput, withMultiOutput, withOutput, withOutput, withOutputFromString, withOutputSerializationConfiguration, withPathOutput, withPathOutput, withStrictCounterChecking

Methods inherited from class java.lang.Object

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

Field Detail

LOG

public static final org.apache.commons.logging.Log LOG

Constructor Detail

MapDriver

public MapDriver(org.apache.hadoop.mapred.Mapper<K1,V1,K2,V2> m)

MapDriver

public MapDriver()

Method Detail

getCounters

public org.apache.hadoop.mapred.Counters getCounters()

Returns:

the counters used in this test

setCounters

public void setCounters(org.apache.hadoop.mapred.Counters ctrs)

Sets the counters object to use for this test.

Parameters:

ctrs - The counters object to use.

withCounters

public MapDriver<K1,V1,K2,V2> withCounters(org.apache.hadoop.mapred.Counters ctrs)

Sets the counters to use and returns self for fluent style

setMapper

public void setMapper(org.apache.hadoop.mapred.Mapper<K1,V1,K2,V2> m)

Set the Mapper instance to use with this test driver

Parameters:

m - the Mapper instance to use

withMapper

public MapDriver<K1,V1,K2,V2> withMapper(org.apache.hadoop.mapred.Mapper<K1,V1,K2,V2> m)

Sets the Mapper instance to use and returns self for fluent style

getMapper

public org.apache.hadoop.mapred.Mapper<K1,V1,K2,V2> getMapper()

Returns:

the Mapper object being used by this test

withOutputFormat

public MapDriver<K1,V1,K2,V2> withOutputFormat(Class<? extends org.apache.hadoop.mapred.OutputFormat> outputFormatClass,
                                      Class<? extends org.apache.hadoop.mapred.InputFormat> inputFormatClass)

Configure Mapper to output with a real OutputFormat. Set InputFormat to read output back in for use with run* methods

Parameters:

outputFormatClass -

inputFormatClass -

Returns:

this for fluent style

run

public List<Pair<K2,V2>> run()
                      throws IOException

Description copied from class: TestDriver

Runs the test but returns the result set instead of validating it (ignores any addOutput(), etc calls made before this)

Specified by:

run in class MapDriverBase<K1,V1,K2,V2,MapDriver<K1,V1,K2,V2>>

Returns:

the list of (k, v) pairs returned as output from the test

Throws:

IOException

toString

public String toString()

Overrides:

toString in class Object

newMapDriver

public static <K1,V1,K2,V2> MapDriver<K1,V1,K2,V2> newMapDriver()

Returns a new MapDriver without having to specify the generic types on the right hand side of the object create statement.

Returns:

new MapDriver

newMapDriver

public static <K1,V1,K2,V2> MapDriver<K1,V1,K2,V2> newMapDriver(org.apache.hadoop.mapred.Mapper<K1,V1,K2,V2> mapper)

Returns a new MapDriver without having to specify the generic types on the right hand side of the object create statement.

Parameters:

mapper -

Returns:

new MapDriver