@ SuppressWarnings ( "unchecked" ) // child types unknown public ComposableRecordReader < K , TupleWritable > getRecordReader ( InputSplit split , JobConf job , Reporter reporter ) throws IOException { setFormat ( job ) ; return root . getRecordReader ( split , job , reporter ) ; }
Construct a CompositeRecordReader for the children of this InputFormat as defined in the init expression . The outermost join need only be composable not necessarily a composite . Mandating TupleWritable isn t strictly correct .