类 org.apache.hadoop.mapreduce.Counter
的使用

使用Counter的程序包

程序包	说明
org.apache.hadoop.mapred	A software framework for easily writing applications which process vast amounts of data (multi-terabyte data-sets) parallelly on large clusters (thousands of nodes) built of commodity hardware in a reliable, fault-tolerant manner.
org.apache.hadoop.mapreduce

org.apache.hadoop.mapred中Counter的使用

org.apache.hadoop.mapred中Counter的子类

限定符和类型	类和说明
static class	Counters.Counter A counter record, comprising its name and value.

参数类型为Counter的org.apache.hadoop.mapred中的方法

限定符和类型	方法和说明
protected static <INKEY,INVALUE,OUTKEY,OUTVALUE> Reducer.Context	Task.createReduceContext(Reducer<INKEY,INVALUE,OUTKEY,OUTVALUE> reducer, Configuration job, TaskAttemptID taskId, RawKeyValueIterator rIter, Counter inputKeyCounter, Counter inputValueCounter, RecordWriter<OUTKEY,OUTVALUE> output, OutputCommitter committer, StatusReporter reporter, RawComparator<INKEY> comparator, Class<INKEY> keyClass, Class<INVALUE> valueClass)

org.apache.hadoop.mapreduce中Counter的使用

返回Counter的org.apache.hadoop.mapreduce中的方法

限定符和类型	方法和说明
Counter	Counters.findCounter(Enum<?> key) Find the counter for the given enum.
Counter	CounterGroup.findCounter(String counterName)
Counter	Counters.findCounter(String groupName, String counterName)
protected Counter	CounterGroup.findCounter(String counterName, String displayName) Internal to find a counter in a group.
Counter	TaskInputOutputContext.getCounter(Enum<?> counterName)
abstract Counter	StatusReporter.getCounter(Enum<?> name)
Counter	TaskInputOutputContext.getCounter(String groupName, String counterName)
abstract Counter	StatusReporter.getCounter(String group, String name)

返回变量类型为Counter的类型的org.apache.hadoop.mapreduce中的方法

限定符和类型	方法和说明
Iterator<Counter>	CounterGroup.iterator()

参数类型为Counter的org.apache.hadoop.mapreduce中的构造器

构造器和说明
ReduceContext(Configuration conf, TaskAttemptID taskid, RawKeyValueIterator input, Counter inputKeyCounter, Counter inputValueCounter, RecordWriter<KEYOUT,VALUEOUT> output, OutputCommitter committer, StatusReporter reporter, RawComparator<KEYIN> comparator, Class<KEYIN> keyClass, Class<VALUEIN> valueClass)
Reducer.Context(Configuration conf, TaskAttemptID taskid, RawKeyValueIterator input, Counter inputKeyCounter, Counter inputValueCounter, RecordWriter<KEYOUT,VALUEOUT> output, OutputCommitter committer, StatusReporter reporter, RawComparator<KEYIN> comparator, Class<KEYIN> keyClass, Class<VALUEIN> valueClass)