org.apache.hadoop.hbase.io.hfile

Class MemcachedBlockCache

java.lang.Object

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

All Implemented Interfaces:

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.

Field Summary

Fields

Modifier and Type	Field and Description
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

Constructor Summary

Constructors

Constructor and Description
MemcachedBlockCache(org.apache.hadoop.conf.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(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()

Methods inherited from class java.lang.Object

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

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

returnBlock

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Detail

MAX_SIZE

public static final int MAX_SIZE

See Also:

Constant Field Values

MEMCACHED_CONFIG_KEY

public static final String MEMCACHED_CONFIG_KEY

See Also:

Constant Field Values

MEMCACHED_TIMEOUT_KEY

public static final String MEMCACHED_TIMEOUT_KEY

See Also:

Constant Field Values

MEMCACHED_OPTIMEOUT_KEY

public static final String MEMCACHED_OPTIMEOUT_KEY

See Also:

Constant Field Values

MEMCACHED_OPTIMIZE_KEY

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

Throws:

IOException

Method Detail

cacheBlock

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

Specified by:

cacheBlock in interface BlockCache

cacheBlock

public void cacheBlock(BlockCacheKey cacheKey,
                       Cacheable buf)

Specified by:

cacheBlock in interface BlockCache

getBlock

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

Specified by:

getBlock in interface BlockCache

evictBlock

public boolean evictBlock(BlockCacheKey cacheKey)

Specified by:

evictBlock in interface BlockCache

evictBlocksByHfileName

public int evictBlocksByHfileName(String hfileName)

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

Specified by:

evictBlocksByHfileName in interface BlockCache

getStats

public CacheStats getStats()

Specified by:

getStats in interface BlockCache

shutdown

public void shutdown()

Specified by:

shutdown in interface BlockCache

size

public long size()

Specified by:

size in interface BlockCache

getMaxSize

public long getMaxSize()

Specified by:

getMaxSize in interface BlockCache

getFreeSize

public long getFreeSize()

Specified by:

getFreeSize in interface BlockCache

getCurrentSize

public long getCurrentSize()

Specified by:

getCurrentSize in interface BlockCache

getCurrentDataSize

public long getCurrentDataSize()

Specified by:

getCurrentDataSize in interface BlockCache

getBlockCount

public long getBlockCount()

Specified by:

getBlockCount in interface BlockCache

getDataBlockCount

public long getDataBlockCount()

Specified by:

getDataBlockCount in interface BlockCache

iterator

public Iterator<CachedBlock> iterator()

Specified by:

iterator in interface Iterable<CachedBlock>

Specified by:

iterator in interface BlockCache

getBlockCaches

public BlockCache[] getBlockCaches()

Specified by:

getBlockCaches in interface BlockCache