org.apache.hadoop.mapreduce.util

Class CountersStrings

java.lang.Object

org.apache.hadoop.mapreduce.util.CountersStrings

@InterfaceAudience.Private
public class CountersStrings
extends Object

String conversion utilities for counters. Candidate for deprecation since we start to use JSON in 0.21+

Constructor Summary

Constructors

Constructor and Description
CountersStrings()

Method Summary

Methods

Modifier and Type	Method and Description
static <C extends Counter,G extends CounterGroupBase<C>,T extends AbstractCounters<C,G>> T	parseEscapedCompactString(String compactString, T counters) Parse a pre 0.21 counters string into a counter object.
static String	toEscapedCompactString(Counter counter) Make the pre 0.21 counter string (for e.g.
static <G extends CounterGroupBase<?>> String	toEscapedCompactString(G group) Make the 0.21 counter group string.
static <C extends Counter,G extends CounterGroupBase<C>,T extends AbstractCounters<C,G>> String	toEscapedCompactString(T counters) Make the pre 0.21 counters string

Methods inherited from class java.lang.Object

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

Constructor Detail

CountersStrings

public CountersStrings()

Method Detail

toEscapedCompactString

public static String toEscapedCompactString(Counter counter)

Make the pre 0.21 counter string (for e.g. old job history files) [(actual-name)(display-name)(value)]

Parameters:

counter - to stringify

Returns:

the stringified result

toEscapedCompactString

public static <G extends CounterGroupBase<?>> String toEscapedCompactString(G group)

Make the 0.21 counter group string. format: {(actual-name)(display-name)(value)[][][]} where [] are compact strings for the counters within.

Type Parameters:

G - type of the group

Parameters:

group - to stringify

Returns:

the stringified result

toEscapedCompactString

public static <C extends Counter,G extends CounterGroupBase<C>,T extends AbstractCounters<C,G>> String toEscapedCompactString(T counters)

Make the pre 0.21 counters string

Type Parameters:

C - type of the counter

G - type of the counter group

T - type of the counters object

Parameters:

counters - the object to stringify

Returns:

the string in the following format {(groupName)(group-displayName)[(counterName)(displayName)(value)]*}*

parseEscapedCompactString

public static <C extends Counter,G extends CounterGroupBase<C>,T extends AbstractCounters<C,G>> T parseEscapedCompactString(String compactString,
                                                                                                            T counters)
                                                            throws ParseException

Parse a pre 0.21 counters string into a counter object.

Type Parameters:

C - type of the counter

G - type of the counter group

T - type of the counters object

Parameters:

compactString - to parse

counters - an empty counters object to hold the result

Returns:

the counters object holding the result

Throws:

ParseException