Package org.apache.accumulo.core.file.blockfile.cache.impl

Class BlockCacheConfiguration

java.lang.Object

org.apache.accumulo.core.file.blockfile.cache.impl.BlockCacheConfiguration

All Implemented Interfaces:

BlockCacheManager.Configuration

public class BlockCacheConfiguration
extends Object
implements BlockCacheManager.Configuration

Constructor Summary

Constructors

Constructor	Description
BlockCacheConfiguration(AccumuloConfiguration conf)

Method Summary

Modifier and Type	Method	Description
long	getBlockSize()	Before Accumulo's cache implementation was configurable, its built in cache had a configurable block size.
long	getMaxSize(CacheType type)	Before Accumulo's cache implementation was configurable, its built in caches had a configurable size.
Map<String,String>	getProperties(String prefix, CacheType type)	This method provides a way for a cache implementation to access arbitrary configuration set by a user.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

BlockCacheConfiguration

public BlockCacheConfiguration(AccumuloConfiguration conf)

Method Detail

getMaxSize

public long getMaxSize(CacheType type)

Description copied from interface: BlockCacheManager.Configuration

Before Accumulo's cache implementation was configurable, its built in caches had a configurable size. These sizes were specified by the system properties tserver.cache.config.data.size, tserver.cache.config.index.size, and {code tserver.cache.config.summary.size}. This method returns the values of those settings. The settings are made available, but cache implementations are under no obligation to use them.

Specified by:

getMaxSize in interface BlockCacheManager.Configuration

getBlockSize

public long getBlockSize()

Description copied from interface: BlockCacheManager.Configuration

Before Accumulo's cache implementation was configurable, its built in cache had a configurable block size. This block size was specified by the system property tserver.default.blocksize. This method returns the value of that setting. The setting is made available, but cache implementations are under no obligation to use it.

Specified by:

getBlockSize in interface BlockCacheManager.Configuration

toString

public String toString()

Overrides:

toString in class Object

getProperties

public Map<String,String> getProperties(String prefix,
                                              CacheType type)

Description copied from interface: BlockCacheManager.Configuration

This method provides a way for a cache implementation to access arbitrary configuration set by a user.

Returns all Accumulo properties that have a prefix of tserver.cache.config.<prefix>.<type>. or tserver.cache.config.<prefix>.default. with values for specific cache types overriding defaults.

For example assume the following data is in Accumulo's system config.

 tserver.cache.config.lru.default.evictAfter=3600
 tserver.cache.config.lru.default.loadFactor=.75
 tserver.cache.config.lru.index.loadFactor=.55
 tserver.cache.config.lru.data.loadFactor=.65
 

If this method is called with prefix=lru and type=INDEX then it would return a map with the following key values. The load factor setting for index overrides the default value.

 evictAfter=3600
 loadFactor=.55
 

Specified by:

getProperties in interface BlockCacheManager.Configuration

Parameters:

prefix - A unique identifier that corresponds to a particular BlockCacheManager implementation.