/// <summary>
/// Combine InputSplits from child InputFormats into a
/// <see cref="CompositeInputSplit"/>
/// .
/// </summary>
/// <exception cref="System.IO.IOException"/>
/// <exception cref="System.Exception"/>
public override IList GetSplits(JobContext job)
{
IList <IList <InputSplit> > splits = new AList <IList <InputSplit> >(kids.Count);
for (int i = 0; i < kids.Count; ++i)
{
IList <InputSplit> tmp = kids[i].GetSplits(job);
if (null == tmp)
{
throw new IOException("Error gathering splits from child RReader");
}
if (i > 0 && splits[i - 1].Count != tmp.Count)
{
throw new IOException("Inconsistent split cardinality from child " + i + " (" + splits
[i - 1].Count + "/" + tmp.Count + ")");
}
splits.Add(i, tmp);
}
int size = splits[0].Count;
IList <InputSplit> ret = new AList <InputSplit>();
for (int i_1 = 0; i_1 < size; ++i_1)
{
CompositeInputSplit split = new CompositeInputSplit(splits.Count);
for (int j = 0; j < splits.Count; ++j)
{
split.Add(splits[j][i_1]);
}
ret.AddItem(split);
}
return(ret);
}
/// <exception cref="System.IO.IOException"/>
/// <exception cref="System.Exception"/>
public override RecordReader CreateRecordReader(InputSplit split, TaskAttemptContext
taskContext)
{
// child types unknowable
if (!(split is CompositeInputSplit))
{
throw new IOException("Invalid split type:" + split.GetType().FullName);
}
CompositeInputSplit spl = (CompositeInputSplit)split;
int capacity = kids.Count;
CompositeRecordReader ret = null;
try
{
if (!rrCstrMap.Contains(ident))
{
throw new IOException("No RecordReader for " + ident);
}
ret = (CompositeRecordReader)rrCstrMap[ident].NewInstance(id, taskContext.GetConfiguration
(), capacity, cmpcl);
}
catch (MemberAccessException e)
{
throw new IOException(e);
}
catch (InstantiationException e)
{
throw new IOException(e);
}
catch (TargetInvocationException e)
{
throw new IOException(e);
}
for (int i = 0; i < capacity; ++i)
{
ret.Add(((ComposableRecordReader)kids[i].CreateRecordReader(spl.Get(i), taskContext
)));
}
return((ComposableRecordReader)ret);
}