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https://issues.apache.org/jira/browse/MAPREDUCE-1623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12862781#action_12862781
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Owen O'Malley commented on MAPREDUCE-1623:
------------------------------------------

o.a.h.mapreduce:

  public, evolving: Cluster, ClusterMetrics, Job, JobCounter, JobPriority, 
JobStatus, MarkableIterator, MarkableIteratorInterface,QueueAclsInfo, 
QueueInfo, QueueState, TaskCounter, TaskReport, TaskTrackerInfo, TaskType

  public,stable: Mapper, Reducer, Counter, CounterGroup, Counters, ID, 
InputFormat, InputSplit, JobContext, JobCounter, JobID, MapContext, Mapper, 
OutputCommitter, OutputFormat, Partitioner, RecordReader, RecordWriter, 
ReduceContext, Reducer, TaskAttemptContext, TaskAttemptID, TaskID, 
TaskInputOutputContext

  private: JobACL, JobSubmissionFiles, JobSubmitter, MRConfig, StatusReporter, 
TaskCompletionEvent, TaskReport

o.a.h.mapreduce.map:
  public, stable: InverseMapper, TokenCounterMapper

o.a..h.mapreduce.lib.output:
  public, stable: NullOutputFormat

o.a.h.mapreduce.lib.partition:
  public, stable: BinaryPartitioner, HashPartitioner, InputSampler, 
TotalOrderPartitioner

o.a.h.mapreduce.lib.reduce:
  public, stable: IntSumReducer, LongSumReducer

o.a.h.mapred:
  public, stable: Counters, ClusterStatus, FileInputFormat, 
FileOutputCommitter, FileOutputFormat, FileSplit, ID, InputFormat, InputSplit, 
IsolationRunner, JobClient, JobConf, JobConfigurable, JobID, JobPriority, 
MapRunnable, MapRunner, Mapper, MultiFileInputFormat, MultiFileSplit, 
OutputCollector, OutputCommitter, OutputFormat, Partitioner, RecordReader, 
RecordWriter, Reducer, Reporter, RunningJob, SequenceFileAsBinaryInputFormat, 
SequenceFileAsBinaryOutputFormat,SequenceFileAsTextInputFormat, 
SequenceFileAsTextRecordReader, SequenceFileInputFilter, 
SequenceFileInputFormat, SequenceFileOutputFormat, SequenceFileRecordReader, 
TaskAttemptID, TaskID, TextInputFormat, TextOutputFormat

o.a.h.mapred.lib:
  public, stable: BinaryPartitioner, Chain, ChainMapper, ChainReducer, 
CombineFileInputFormat, CombineFileRecordReader, CombineFileSplit, 
DelegatingInputFormat, DelegationMapper, FieldSelectionMapReduce, 
FilterOutputFormat, HashPartitioner, IdentityMapper, IdentityReducer, 
InputSampler, InverseMapper, KeyFieldBasedComparator, KeyFieldBasedPartitioner, 
LazyOutputFormat, LongSumReducer, MultipleInputs, MultipleOutputFormat, 
MultipleSequenceFileOutputFormat, MultipleTextOutputFormat, 
MultithreadedMapRunner, NLineInputFormat, NullOutputFormat, RegexMapper, 
TaggedInputSplit, TokenCountMapper, TotalOrderPartitioner

> Apply audience and stability annotations to classes in mapred package
> ---------------------------------------------------------------------
>
>                 Key: MAPREDUCE-1623
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1623
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>          Components: documentation
>            Reporter: Tom White
>            Assignee: Tom White
>            Priority: Blocker
>             Fix For: 0.22.0
>
>         Attachments: M1623-1.patch, MAPREDUCE-1623.patch, 
> MAPREDUCE-1623.patch, MAPREDUCE-1623.patch, MAPREDUCE-1623.patch, 
> MAPREDUCE-1623.patch, MAPREDUCE-1623.patch, MAPREDUCE-1623.patch
>
>
> There are lots of implementation classes in org.apache.hadoop.mapred which 
> makes it difficult to see the user-level MapReduce API classes in the 
> Javadoc. (See 
> http://hadoop.apache.org/common/docs/r0.20.2/api/org/apache/hadoop/mapred/package-summary.html
>  for example.) By marking these implementation classes with the 
> InterfaceAudience.Private annotation we can exclude them from user Javadoc 
> (using HADOOP-6658).
> Later work will move the implementation classes into o.a.h.mapreduce.server 
> and related packages (see MAPREDUCE-561), but applying the annotations is a 
> good first step. 

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