org.apache.hadoop.hbase.mapreduce

Class RowCounter

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.hadoop.hbase.mapreduce.RowCounter

All Implemented Interfaces:

org.apache.hadoop.conf.Configurable, org.apache.hadoop.util.Tool

@InterfaceAudience.Public
public class RowCounter
extends org.apache.hadoop.conf.Configured
implements org.apache.hadoop.util.Tool

A job with a just a map phase to count rows. Map outputs table rows IF the input row has columns that have content.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
(package private) static class	RowCounter.RowCounterMapper Mapper that runs the count.

Field Summary

Fields

Modifier and Type	Field and Description
private static String	EXPECTED_COUNT_KEY
private static String	JOB_NAME_CONF_KEY
private static org.slf4j.Logger	LOG
(package private) static String	NAME Name of this 'program'.

Constructor Summary

Constructors

Constructor and Description
RowCounter()

Method Summary

Modifier and Type	Method and Description
static org.apache.hadoop.mapreduce.Job	createSubmittableJob(org.apache.hadoop.conf.Configuration conf, String[] args) Sets up the actual job.
static void	main(String[] args) Main entry point.
private static List<MultiRowRangeFilter.RowRange>	parseRowRangeParameter(String arg, String rangeSwitch)
private static void	printUsage() Prints usage without error message.
private static void	printUsage(String errorMessage)
int	run(String[] args)
private static void	setScanFilter(Scan scan, List<MultiRowRangeFilter.RowRange> rowRangeList) Sets filter FilterBase to the Scan instance.

Methods inherited from class org.apache.hadoop.conf.Configured

getConf, setConf

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.conf.Configurable

getConf, setConf

Field Detail

LOG

private static final org.slf4j.Logger LOG

NAME

static final String NAME

Name of this 'program'.

See Also:

Constant Field Values

JOB_NAME_CONF_KEY

private static final String JOB_NAME_CONF_KEY

See Also:

Constant Field Values

EXPECTED_COUNT_KEY

private static final String EXPECTED_COUNT_KEY

Constructor Detail

RowCounter

public RowCounter()

Method Detail

createSubmittableJob

public static org.apache.hadoop.mapreduce.Job createSubmittableJob(org.apache.hadoop.conf.Configuration conf,
                                                                   String[] args)
                                                            throws IOException

Sets up the actual job.

Parameters:

conf - The current configuration.

args - The command line parameters.

Returns:

The newly created job.

Throws:

IOException - When setting up the job fails.

parseRowRangeParameter

private static List<MultiRowRangeFilter.RowRange> parseRowRangeParameter(String arg,
                                                                         String rangeSwitch)

setScanFilter

private static void setScanFilter(Scan scan,
                                  List<MultiRowRangeFilter.RowRange> rowRangeList)

Sets filter FilterBase to the Scan instance. If provided rowRangeList contains more than one element, method sets filter which is instance of MultiRowRangeFilter. Otherwise, method sets filter which is instance of FirstKeyOnlyFilter. If rowRangeList contains exactly one element, startRow and stopRow are set to the scan.

Parameters:

scan -

rowRangeList -

printUsage

private static void printUsage(String errorMessage)

printUsage

private static void printUsage()

Prints usage without error message. Note that we don't document --expected-count, because it's intended for test.

run

public int run(String[] args)
        throws Exception

Specified by:

run in interface org.apache.hadoop.util.Tool

Throws:

Exception

main

public static void main(String[] args)
                 throws Exception

Main entry point.

Parameters:

args - The command line parameters.

Throws:

Exception - When running the job fails.