org.apache.hadoop.hbase.io.hfile

Class MemcachedBlockCache

java.lang.Object

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

public class MemcachedBlockCache
extends java.lang.Object

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.

Field Summary

Fields

Modifier and Type	Field and Description
static int	MAX_SIZE
static java.lang.String	MEMCACHED_CONFIG_KEY
static long	MEMCACHED_DEFAULT_TIMEOUT
static java.lang.String	MEMCACHED_OPTIMEOUT_KEY
static boolean	MEMCACHED_OPTIMIZE_DEFAULT
static java.lang.String	MEMCACHED_OPTIMIZE_KEY
static java.lang.String	MEMCACHED_TIMEOUT_KEY

Constructor Summary

Constructors

Constructor and Description
MemcachedBlockCache(Configuration c)

Method Summary

Modifier and Type	Method and Description
void	cacheBlock(BlockCacheKey cacheKey, Cacheable buf)
void	cacheBlock(BlockCacheKey cacheKey, Cacheable buf, boolean inMemory)
boolean	evictBlock(BlockCacheKey cacheKey)
int	evictBlocksByHfileName(java.lang.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()
java.util.Iterator<CachedBlock>	iterator()
void	shutdown()
long	size()

Methods inherited from class java.lang.Object

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

Field Detail

MAX_SIZE

public static final int MAX_SIZE

See Also:

Constant Field Values

MEMCACHED_CONFIG_KEY

public static final java.lang.String MEMCACHED_CONFIG_KEY

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Constant Field Values

MEMCACHED_TIMEOUT_KEY

public static final java.lang.String MEMCACHED_TIMEOUT_KEY

See Also:

Constant Field Values

MEMCACHED_OPTIMEOUT_KEY

public static final java.lang.String MEMCACHED_OPTIMEOUT_KEY

See Also:

Constant Field Values

MEMCACHED_OPTIMIZE_KEY

public static final java.lang.String MEMCACHED_OPTIMIZE_KEY

See Also:

Constant Field Values

MEMCACHED_DEFAULT_TIMEOUT

public static final long MEMCACHED_DEFAULT_TIMEOUT

See Also:

Constant Field Values

MEMCACHED_OPTIMIZE_DEFAULT

public static final boolean MEMCACHED_OPTIMIZE_DEFAULT

See Also:

Constant Field Values

Constructor Detail

MemcachedBlockCache

public MemcachedBlockCache(Configuration c)
                    throws java.io.IOException

Throws:

java.io.IOException

Method Detail

cacheBlock

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

cacheBlock

public void cacheBlock(BlockCacheKey cacheKey,
                       Cacheable buf)

getBlock

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

evictBlock

public boolean evictBlock(BlockCacheKey cacheKey)

evictBlocksByHfileName

public int evictBlocksByHfileName(java.lang.String hfileName)

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

getStats

public CacheStats getStats()

shutdown

public void shutdown()

size

public long size()

getMaxSize

public long getMaxSize()

getFreeSize

public long getFreeSize()

getCurrentSize

public long getCurrentSize()

getCurrentDataSize

public long getCurrentDataSize()

getBlockCount

public long getBlockCount()

getDataBlockCount

public long getDataBlockCount()

iterator

public java.util.Iterator<CachedBlock> iterator()

getBlockCaches

public BlockCache[] getBlockCaches()