@InterfaceAudience.Public @InterfaceStability.Stable public class ValueAggregatorBaseDescriptor extends Object implements ValueAggregatorDescriptor
Modifier and Type | Field and Description |
---|---|
static String |
DOUBLE_VALUE_SUM |
String |
inputFile |
static String |
LONG_VALUE_MAX |
static String |
LONG_VALUE_MIN |
static String |
LONG_VALUE_SUM |
static String |
STRING_VALUE_MAX |
static String |
STRING_VALUE_MIN |
static String |
UNIQ_VALUE_COUNT |
static String |
VALUE_HISTOGRAM |
ONE, TYPE_SEPARATOR
Constructor and Description |
---|
ValueAggregatorBaseDescriptor() |
Modifier and Type | Method and Description |
---|---|
void |
configure(Configuration conf)
get the input file name.
|
static Map.Entry<Text,Text> |
generateEntry(String type,
String id,
Text val) |
ArrayList<Map.Entry<Text,Text>> |
generateKeyValPairs(Object key,
Object val)
Generate 1 or 2 aggregation-id/value pairs for the given key/value pair.
|
static ValueAggregator |
generateValueAggregator(String type,
long uniqCount) |
public static final String UNIQ_VALUE_COUNT
public static final String LONG_VALUE_SUM
public static final String DOUBLE_VALUE_SUM
public static final String VALUE_HISTOGRAM
public static final String LONG_VALUE_MAX
public static final String LONG_VALUE_MIN
public static final String STRING_VALUE_MAX
public static final String STRING_VALUE_MIN
public ValueAggregatorBaseDescriptor()
public static Map.Entry<Text,Text> generateEntry(String type, String id, Text val)
type
- the aggregation typeid
- the aggregation idval
- the val associated with the id to be aggregatedpublic static ValueAggregator generateValueAggregator(String type, long uniqCount)
type
- the aggregation typeuniqCount
- the limit in the number of unique values to keep,
if type is UNIQ_VALUE_COUNTpublic ArrayList<Map.Entry<Text,Text>> generateKeyValPairs(Object key, Object val)
generateKeyValPairs
in interface ValueAggregatorDescriptor
key
- input keyval
- input valuepublic void configure(Configuration conf)
configure
in interface ValueAggregatorDescriptor
conf
- a configuration objectCopyright © 2015 Apache Software Foundation. All rights reserved.