org.apache.hadoop.hive.common.metrics
Class Metrics

java.lang.Object
  org.apache.hadoop.hive.common.metrics.Metrics

public class Metrics
extends Object

Metrics Subsystem - allows exposure of a number of named parameters/counters via jmx, intended to be used as a static subsystem Has a couple of primary ways it can be used: (i) Using the set and get methods to set and get named parameters (ii) Using the incrementCounter method to increment and set named parameters in one go, rather than having to make a get and then a set. (iii) Using the startScope and endScope methods to start and end named "scopes" that record the number of times they've been instantiated and amount of time(in milliseconds) spent inside the scopes.

Nested Class Summary

class

Metrics.MetricsScope MetricsScope : A class that encapsulates an idea of a metered scope.

Constructor Summary

Metrics()

Method Summary

static void	endScope(String name)
static Object	get(String name)
static Metrics.MetricsScope	getScope(String name)
static Long	incrementCounter(String name)
static Long	incrementCounter(String name, long increment)
static void	init()
static void	set(String name, Object value)
static Metrics.MetricsScope	startScope(String name)

Methods inherited from class java.lang.Object

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

Constructor Detail

Metrics

public Metrics()

Method Detail

init

public static void init()
                 throws Exception

Throws:

Exception

incrementCounter

public static Long incrementCounter(String name)
                             throws IOException

Throws:

IOException

incrementCounter

public static Long incrementCounter(String name,
                                    long increment)
                             throws IOException

Throws:

IOException

set

public static void set(String name,
                       Object value)
                throws IOException

Throws:

IOException

get

public static Object get(String name)
                  throws IOException

Throws:

IOException

startScope

public static Metrics.MetricsScope startScope(String name)
                                       throws IOException

Throws:

IOException

getScope

public static Metrics.MetricsScope getScope(String name)
                                     throws IOException

Throws:

IOException

endScope

public static void endScope(String name)
                     throws IOException

Throws:

IOException