@InterfaceAudience.Public @InterfaceStability.Stable public abstract class MultiFilterRecordReader<K extends WritableComparable,V extends Writable> extends CompositeRecordReader<K,V,V> implements ComposableRecordReader<K,V>
jc, kids| Constructor and Description |
|---|
MultiFilterRecordReader(int id,
JobConf conf,
int capacity,
Class<? extends WritableComparator> cmpcl) |
| Modifier and Type | Method and Description |
|---|---|
protected boolean |
combine(Object[] srcs,
TupleWritable dst)
Default implementation offers
emit(org.apache.hadoop.mapred.join.TupleWritable) every Tuple from the
collector (the outer join of child RRs). |
V |
createValue()
Create an object of the appropriate type to be used as a value.
|
protected abstract V |
emit(TupleWritable dst)
For each tuple emitted, return a value (typically one of the values
in the tuple).
|
protected ResetableIterator<V> |
getDelegate()
Return an iterator returning a single value from the tuple.
|
boolean |
next(K key,
V value)
Reads the next key/value pair from the input for processing.
|
accept, add, close, compareTo, createInternalValue, createKey, fillJoinCollector, getComparator, getConf, getPos, getProgress, getRecordReaderQueue, hasNext, id, key, key, setConf, skipclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitaccept, hasNext, id, key, key, skipclose, createKey, getPos, getProgresscompareTopublic MultiFilterRecordReader(int id,
JobConf conf,
int capacity,
Class<? extends WritableComparator> cmpcl)
throws IOException
IOExceptionprotected abstract V emit(TupleWritable dst) throws IOException
IOExceptionprotected boolean combine(Object[] srcs, TupleWritable dst)
emit(org.apache.hadoop.mapred.join.TupleWritable) every Tuple from the
collector (the outer join of child RRs).combine in class CompositeRecordReader<K extends WritableComparable,V extends Writable,V extends Writable>public boolean next(K key, V value) throws IOException
next in interface RecordReader<K extends WritableComparable,V extends Writable>key - the key to read data intovalue - the value to read data intoIOExceptionpublic V createValue()
createValue in interface RecordReader<K extends WritableComparable,V extends Writable>protected ResetableIterator<V> getDelegate()
getDelegate in class CompositeRecordReader<K extends WritableComparable,V extends Writable,V extends Writable>MultiFilterRecordReader.MultiFilterDelegationIteratorCopyright © 2022 Apache Software Foundation. All rights reserved.