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public interface BlockCache
Block cache interface. Anything that implements the Cacheable
interface can be put in the cache.
Method Summary | |
---|---|
void |
cacheBlock(BlockCacheKey cacheKey,
Cacheable buf)
Add block to cache (defaults to not in-memory). |
void |
cacheBlock(BlockCacheKey cacheKey,
Cacheable buf,
boolean inMemory)
Add block to cache. |
boolean |
evictBlock(BlockCacheKey cacheKey)
Evict block from cache. |
int |
evictBlocksByHfileName(String hfileName)
Evicts all blocks for the given HFile. |
Cacheable |
getBlock(BlockCacheKey cacheKey,
boolean caching,
boolean repeat)
Fetch block from cache. |
List<BlockCacheColumnFamilySummary> |
getBlockCacheColumnFamilySummaries(org.apache.hadoop.conf.Configuration conf)
Performs a BlockCache summary and returns a List of BlockCacheColumnFamilySummary objects. |
long |
getBlockCount()
Returns the number of blocks currently cached in the block cache. |
long |
getCurrentSize()
Returns the occupied size of the block cache, in bytes. |
long |
getEvictedCount()
Returns the number of evictions that have occurred. |
long |
getFreeSize()
Returns the free size of the block cache, in bytes. |
CacheStats |
getStats()
Get the statistics for this block cache. |
void |
shutdown()
Shutdown the cache. |
long |
size()
Returns the total size of the block cache, in bytes. |
Method Detail |
---|
void cacheBlock(BlockCacheKey cacheKey, Cacheable buf, boolean inMemory)
cacheKey
- The block's cache key.buf
- The block contents wrapped in a ByteBuffer.inMemory
- Whether block should be treated as in-memoryvoid cacheBlock(BlockCacheKey cacheKey, Cacheable buf)
cacheKey
- The block's cache key.buf
- The object to cache.Cacheable getBlock(BlockCacheKey cacheKey, boolean caching, boolean repeat)
cacheKey
- Block to fetch.caching
- Whether this request has caching enabled (used for stats)repeat
- Whether this is a repeat lookup for the same block
(used to avoid double counting cache misses when doing double-check locking)
HFileReaderV2.readBlock(long, long, boolean, boolean, boolean, BlockType)
boolean evictBlock(BlockCacheKey cacheKey)
cacheKey
- Block to evict
int evictBlocksByHfileName(String hfileName)
CacheStats getStats()
void shutdown()
long size()
long getFreeSize()
long getCurrentSize()
long getEvictedCount()
long getBlockCount()
List<BlockCacheColumnFamilySummary> getBlockCacheColumnFamilySummaries(org.apache.hadoop.conf.Configuration conf) throws IOException
conf
- HBaseConfiguration
IOException
- exception
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