/// <summary>
/// Create a map context that is based on ChainMapContext and the given record
/// reader and record writer
/// </summary>
private Mapper.Context CreateMapContext <Keyin, Valuein, Keyout, Valueout>(RecordReader
<KEYIN, VALUEIN> rr, RecordWriter <KEYOUT, VALUEOUT> rw, TaskInputOutputContext <KEYIN
, VALUEIN, KEYOUT, VALUEOUT> context, Configuration conf)
{
MapContext <KEYIN, VALUEIN, KEYOUT, VALUEOUT> mapContext = new ChainMapContextImpl
<KEYIN, VALUEIN, KEYOUT, VALUEOUT>(context, rr, rw, conf);
Mapper.Context mapperContext = new WrappedMapper <KEYIN, VALUEIN, KEYOUT, VALUEOUT
>().GetMapContext(mapContext);
return(mapperContext);
}
public virtual void TestCloneMapContext()
{
TaskID taskId = new TaskID(jobId, TaskType.Map, 0);
TaskAttemptID taskAttemptid = new TaskAttemptID(taskId, 0);
MapContext <IntWritable, IntWritable, IntWritable, IntWritable> mapContext = new MapContextImpl
<IntWritable, IntWritable, IntWritable, IntWritable>(conf, taskAttemptid, null,
null, null, null, null);
Mapper.Context mapperContext = new WrappedMapper <IntWritable, IntWritable, IntWritable
, IntWritable>().GetMapContext(mapContext);
ContextFactory.CloneMapContext(mapperContext, conf, null, null);
}
