Uses of Interface org.apache.hadoop.mapred.join.ComposableRecordReader (Hadoop 1.2.1 API)
Date: 2013-07-22

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## Uses of Interface
org.apache.hadoop.mapred.join.ComposableRecordReader

Packages that use ComposableRecordReader
org.apache.hadoop.mapred.join | Given a set of sorted datasets keyed with the same class and yielding equal partitions, it is possible to effect a join of those datasets prior to the map.

Uses of ComposableRecordReader in org.apache.hadoop.mapred.join

Classes in org.apache.hadoop.mapred.join that implement ComposableRecordReader
`class` | `InnerJoinRecordReader<K extends WritableComparable>` Full inner join.
`class` | `JoinRecordReader<K extends WritableComparable>` Base class for Composite joins returning Tuples of arbitrary Writables.
`class` | `MultiFilterRecordReader<K extends WritableComparable,V extends Writable>` Base class for Composite join returning values derived from multiple sources, but generally not tuples.
`class` | `OuterJoinRecordReader<K extends WritableComparable>` Full outer join.
`class` | `OverrideRecordReader<K extends WritableComparable,V extends Writable>` Prefer the "rightmost" data source for this key.
`class` | `WrappedRecordReader<K extends WritableComparable,U extends Writable>` Proxy class for a RecordReader participating in the join framework.

Fields in org.apache.hadoop.mapred.join declared as ComposableRecordReader
`protected ComposableRecordReader<K,? extends V>[]` | `CompositeRecordReader.kids`

Fields in org.apache.hadoop.mapred.join with type parameters of type ComposableRecordReader
`protected static Map<String,Constructor<? extends ComposableRecordReader>>` | `Parser.Node.rrCstrMap`

Methods in org.apache.hadoop.mapred.join that return ComposableRecordReader
`ComposableRecordReader<K,V>` | `ComposableInputFormat.getRecordReader(InputSplit split, JobConf job, Reporter reporter)`
`ComposableRecordReader<K,TupleWritable>` | `CompositeInputFormat.getRecordReader(InputSplit split, JobConf job, Reporter reporter)` Construct a CompositeRecordReader for the children of this InputFormat as defined in the init expression.

Methods in org.apache.hadoop.mapred.join that return types with arguments of type ComposableRecordReader
`protected PriorityQueue<ComposableRecordReader<K,?>>` | `CompositeRecordReader.getRecordReaderQueue()` Return sorted list of RecordReaders for this composite.

Methods in org.apache.hadoop.mapred.join with parameters of type ComposableRecordReader
`void` | `CompositeRecordReader.add(ComposableRecordReader<K,? extends V> rr)` Add a RecordReader to this collection.
`int` | `CompositeRecordReader.compareTo(ComposableRecordReader<K,?> other)` Implement Comparable contract (compare key of join or head of heap with that of another).
`int` | `WrappedRecordReader.compareTo(ComposableRecordReader<K,?> other)` Implement Comparable contract (compare key at head of proxied RR with that of another).

Method parameters in org.apache.hadoop.mapred.join with type arguments of type ComposableRecordReader
`protected static void` | `Parser.Node.addIdentifier(String ident, Class<?>[] mcstrSig, Class<? extends Parser.Node> nodetype, Class<? extends ComposableRecordReader> cl)` For a given identifier, add a mapping to the nodetype for the parse tree and to the ComposableRecordReader to be created, including the formals required to invoke the constructor.

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