org.apache.hadoop.hbase.io.hfile

Class IndexOnlyLruBlockCache

java.lang.Object

org.apache.hadoop.hbase.io.hfile.LruBlockCache

org.apache.hadoop.hbase.io.hfile.IndexOnlyLruBlockCache

All Implemented Interfaces:

Iterable<CachedBlock>, HeapSize, BlockCache, FirstLevelBlockCache, ResizableBlockCache

@InterfaceAudience.Private
public class IndexOnlyLruBlockCache
extends LruBlockCache

An on heap block cache implementation extended LruBlockCache and only cache index block. This block cache should be only used by ClientSideRegionScanner that normally considers to be used by client resides out of the region server, e.g. a container of a map reduce job.

Field Summary

Fields inherited from class org.apache.hadoop.hbase.io.hfile.LruBlockCache

CACHE_FIXED_OVERHEAD

Constructor Summary

Constructors

Constructor and Description
IndexOnlyLruBlockCache(long maxSize, long blockSize, boolean evictionThread, org.apache.hadoop.conf.Configuration conf)

Method Summary

Modifier and Type	Method and Description
void	cacheBlock(BlockCacheKey cacheKey, Cacheable buf, boolean inMemory) Cache only index block with the specified name and buffer

Methods inherited from class org.apache.hadoop.hbase.io.hfile.LruBlockCache

cacheBlock, clearCache, containsBlock, evictBlock, evictBlock, evictBlocksByHfileName, getBlock, getBlockCaches, getBlockCount, getBloomBlockCount, getCurrentBloomSize, getCurrentDataSize, getCurrentIndexSize, getCurrentSize, getDataBlockCount, getEncodingCountsForTest, getFreeSize, getIndexBlockCount, getMaxSize, getStats, heapSize, iterator, logStats, setMaxSize, setVictimCache, shutdown, size, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.hbase.io.hfile.BlockCache

cacheBlock, isMetaBlock

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

IndexOnlyLruBlockCache

public IndexOnlyLruBlockCache(long maxSize,
                              long blockSize,
                              boolean evictionThread,
                              org.apache.hadoop.conf.Configuration conf)

Method Detail

cacheBlock

public void cacheBlock(BlockCacheKey cacheKey,
                       Cacheable buf,
                       boolean inMemory)

Cache only index block with the specified name and buffer

Specified by:

cacheBlock in interface BlockCache

Overrides:

cacheBlock in class LruBlockCache

Parameters:

cacheKey - block's cache key

buf - block buffer

inMemory - if block is in-memory