org.apache.hadoop.hbase.io.hfile

类 MemcachedBlockCache

java.lang.Object

org.apache.hadoop.hbase.io.hfile.MemcachedBlockCache

所有已实现的接口:

Iterable<CachedBlock>, BlockCache

@InterfaceAudience.Private
public class MemcachedBlockCache
extends Object
implements BlockCache

Class to store blocks into memcached. This should only be used on a cluster of Memcached daemons that are tuned well and have a good network connection to the HBase regionservers. Any other use will likely slow down HBase greatly.

字段概要

字段

限定符和类型	字段和说明
static int	MAX_SIZE
static String	MEMCACHED_CONFIG_KEY
static long	MEMCACHED_DEFAULT_TIMEOUT
static String	MEMCACHED_OPTIMEOUT_KEY
static boolean	MEMCACHED_OPTIMIZE_DEFAULT
static String	MEMCACHED_OPTIMIZE_KEY
static String	MEMCACHED_TIMEOUT_KEY

构造器概要

构造器

构造器和说明
MemcachedBlockCache(org.apache.hadoop.conf.Configuration c)

方法概要

限定符和类型	方法和说明
void	cacheBlock(BlockCacheKey cacheKey, Cacheable buf)
void	cacheBlock(BlockCacheKey cacheKey, Cacheable buf, boolean inMemory)
boolean	evictBlock(BlockCacheKey cacheKey)
int	evictBlocksByHfileName(String hfileName) This method does nothing so that memcached can handle all evictions.
Cacheable	getBlock(BlockCacheKey cacheKey, boolean caching, boolean repeat, boolean updateCacheMetrics)
BlockCache[]	getBlockCaches()
long	getBlockCount()
long	getCurrentDataSize()
long	getCurrentSize()
long	getDataBlockCount()
long	getFreeSize()
long	getMaxSize()
CacheStats	getStats()
Iterator<CachedBlock>	iterator()
void	shutdown()
long	size()

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.hadoop.hbase.io.hfile.BlockCache

returnBlock

从接口继承的方法 java.lang.Iterable

forEach, spliterator

字段详细资料

MAX_SIZE

public static final int MAX_SIZE

另请参阅:

常量字段值

MEMCACHED_CONFIG_KEY

public static final String MEMCACHED_CONFIG_KEY

另请参阅:

常量字段值

MEMCACHED_TIMEOUT_KEY

public static final String MEMCACHED_TIMEOUT_KEY

另请参阅:

常量字段值

MEMCACHED_OPTIMEOUT_KEY

public static final String MEMCACHED_OPTIMEOUT_KEY

另请参阅:

常量字段值

MEMCACHED_OPTIMIZE_KEY

public static final String MEMCACHED_OPTIMIZE_KEY

另请参阅:

常量字段值

MEMCACHED_DEFAULT_TIMEOUT

public static final long MEMCACHED_DEFAULT_TIMEOUT

另请参阅:

常量字段值

MEMCACHED_OPTIMIZE_DEFAULT

public static final boolean MEMCACHED_OPTIMIZE_DEFAULT

另请参阅:

常量字段值

构造器详细资料

MemcachedBlockCache

public MemcachedBlockCache(org.apache.hadoop.conf.Configuration c)
                    throws IOException

抛出:

IOException

方法详细资料

cacheBlock

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

指定者:

cacheBlock 在接口中 BlockCache

cacheBlock

public void cacheBlock(BlockCacheKey cacheKey,
                       Cacheable buf)

指定者:

cacheBlock 在接口中 BlockCache

getBlock

public Cacheable getBlock(BlockCacheKey cacheKey,
                          boolean caching,
                          boolean repeat,
                          boolean updateCacheMetrics)

指定者:

getBlock 在接口中 BlockCache

evictBlock

public boolean evictBlock(BlockCacheKey cacheKey)

指定者:

evictBlock 在接口中 BlockCache

evictBlocksByHfileName

public int evictBlocksByHfileName(String hfileName)

This method does nothing so that memcached can handle all evictions.

指定者:

evictBlocksByHfileName 在接口中 BlockCache

getStats

public CacheStats getStats()

指定者:

getStats 在接口中 BlockCache

shutdown

public void shutdown()

指定者:

shutdown 在接口中 BlockCache

size

public long size()

指定者:

size 在接口中 BlockCache

getMaxSize

public long getMaxSize()

指定者:

getMaxSize 在接口中 BlockCache

getFreeSize

public long getFreeSize()

指定者:

getFreeSize 在接口中 BlockCache

getCurrentSize

public long getCurrentSize()

指定者:

getCurrentSize 在接口中 BlockCache

getCurrentDataSize

public long getCurrentDataSize()

指定者:

getCurrentDataSize 在接口中 BlockCache

getBlockCount

public long getBlockCount()

指定者:

getBlockCount 在接口中 BlockCache

getDataBlockCount

public long getDataBlockCount()

指定者:

getDataBlockCount 在接口中 BlockCache

iterator

public Iterator<CachedBlock> iterator()

指定者:

iterator 在接口中 Iterable<CachedBlock>

指定者:

iterator 在接口中 BlockCache

getBlockCaches

public BlockCache[] getBlockCaches()

指定者:

getBlockCaches 在接口中 BlockCache