org.apache.carbondata.datamap.bloom

Class BloomDataMapCache

java.lang.Object

org.apache.carbondata.datamap.bloom.BloomDataMapCache

All Implemented Interfaces:

Serializable

@InterfaceAudience.Internal
public class BloomDataMapCache
extends Object
implements Serializable

This class is used to add cache for bloomfilter datamap to accelerate query through it. The cache is implemented using guava cache and is a singleton which will be shared by all the bloomfilter datamaps. As for the cache, the key is a bloomindex file for a shard and the value is the bloomfilters for the blocklets in this shard. The size of cache can be configurable through CarbonProperties and the cache will be expired if no one access it in the past 2 hours.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	BloomDataMapCache.CacheKey

Method Summary

Modifier and Type	Method and Description
List<BloomDMModel>	getBloomDMModelByKey(BloomDataMapCache.CacheKey cacheKey) get bloom datamap from cache
static BloomDataMapCache	getInstance() get instance
protected Object	readResolve() for resolve from serialized

Methods inherited from class java.lang.Object

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

Method Detail

getInstance

public static BloomDataMapCache getInstance()

get instance

readResolve

protected Object readResolve()

for resolve from serialized

getBloomDMModelByKey

public List<BloomDMModel> getBloomDMModelByKey(BloomDataMapCache.CacheKey cacheKey)

get bloom datamap from cache