org.apache.hadoop.hive.ql.exec.mr
Class ObjectCache

java.lang.Object
  org.apache.hadoop.hive.ql.exec.mr.ObjectCache

All Implemented Interfaces:

ObjectCache

public class ObjectCache
extends Object
implements ObjectCache

ObjectCache. No-op implementation on MR we don't have a means to reuse Objects between runs of the same task.

Constructor Summary

ObjectCache()

Method Summary

void	cache(String key, Object value) Add an object to the cache
Object	retrieve(String key) Retrieve object from cache.

Methods inherited from class java.lang.Object

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

Constructor Detail

ObjectCache

public ObjectCache()

Method Detail

cache

public void cache(String key,
                  Object value)

Description copied from interface: ObjectCache

Add an object to the cache

Specified by:

cache in interface ObjectCache

retrieve

public Object retrieve(String key)

Description copied from interface: ObjectCache

Retrieve object from cache.

Specified by:

retrieve in interface ObjectCache

Returns:

the last cached object with the key, null if none.