org.apache.hadoop.hive.metastore

Class Batchable<I,R>

java.lang.Object

org.apache.hadoop.hive.metastore.Batchable<I,R>

public abstract class Batchable<I,R>
extends Object

Base class to add the batch process for DirectSQL or RawStore queries. 1. Provide the implementation of run() to process one batch 2. Call Batchable.runBatched() to process the whole dataset I: input type, R: result type

Field Summary

Fields

Modifier and Type	Field and Description
static int	NO_BATCHING

Constructor Summary

Constructors

Constructor and Description
Batchable()

Method Summary

Modifier and Type	Method and Description
protected void	addQueryAfterUse(Batchable<?,?> b)
void	addQueryAfterUse(javax.jdo.Query query)
void	closeAllQueries()
abstract List<R>	run(List<I> input)
static <I,R> List<R>	runBatched(int batchSize, List<I> input, Batchable<I,R> runnable)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

NO_BATCHING

public static final int NO_BATCHING

See Also:

Constant Field Values

Constructor Detail

Batchable

public Batchable()

Method Detail

run

public abstract List<R> run(List<I> input)
                     throws Exception

Throws:

Exception

addQueryAfterUse

public void addQueryAfterUse(javax.jdo.Query query)

addQueryAfterUse

protected void addQueryAfterUse(Batchable<?,?> b)

closeAllQueries

public void closeAllQueries()

runBatched

public static <I,R> List<R> runBatched(int batchSize,
                                       List<I> input,
                                       Batchable<I,R> runnable)
                                throws MetaException

Throws:

MetaException