org.apache.hadoop.hbase.io.hfile
Class BlockCacheUtil

java.lang.Object
  org.apache.hadoop.hbase.io.hfile.BlockCacheUtil

@InterfaceAudience.Private
public class BlockCacheUtil
extends Object

Utilty for aggregating counts in CachedBlocks and toString/toJSON CachedBlocks and BlockCaches. No attempt has been made at making this thread safe.

Nested Class Summary

static class	BlockCacheUtil.AgeSnapshot Snapshot of block cache age in cache.
static class	BlockCacheUtil.CachedBlocksByFile Use one of these to keep a running account of cached blocks by file.

Constructor Summary

BlockCacheUtil()

Method Summary

static BlockCacheUtil.CachedBlocksByFile	getLoadedCachedBlocksByFile(org.apache.hadoop.conf.Configuration conf, BlockCache bc) Get a BlockCacheUtil.CachedBlocksByFile instance and load it up by iterating content in BlockCache.
static String	toJSON(BlockCache bc)
static String	toJSON(BlockCacheUtil.CachedBlocksByFile cbsbf)
static String	toJSON(String filename, NavigableSet<CachedBlock> blocks)
static String	toString(CachedBlock cb, long now)
static String	toStringMinusFileName(CachedBlock cb, long now)

Methods inherited from class java.lang.Object

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

Constructor Detail

BlockCacheUtil

public BlockCacheUtil()

Method Detail

toString

public static String toString(CachedBlock cb,
                              long now)

Parameters:

cb -

Returns:

The block content as String.

toJSON

public static String toJSON(String filename,
                            NavigableSet<CachedBlock> blocks)
                     throws org.codehaus.jackson.JsonGenerationException,
                            org.codehaus.jackson.map.JsonMappingException,
                            IOException

Parameters:

filename -

blocks -

Returns:

A JSON String of filename and counts of blocks

Throws:

org.codehaus.jackson.JsonGenerationException

org.codehaus.jackson.map.JsonMappingException

IOException

toJSON

public static String toJSON(BlockCacheUtil.CachedBlocksByFile cbsbf)
                     throws org.codehaus.jackson.JsonGenerationException,
                            org.codehaus.jackson.map.JsonMappingException,
                            IOException

Parameters:

cbsbf -

Returns:

JSON string of cbsf aggregated

Throws:

org.codehaus.jackson.JsonGenerationException

org.codehaus.jackson.map.JsonMappingException

IOException

toJSON

public static String toJSON(BlockCache bc)
                     throws org.codehaus.jackson.JsonGenerationException,
                            org.codehaus.jackson.map.JsonMappingException,
                            IOException

Parameters:

bc -

Returns:

JSON string of bc content.

Throws:

org.codehaus.jackson.JsonGenerationException

org.codehaus.jackson.map.JsonMappingException

IOException

toStringMinusFileName

public static String toStringMinusFileName(CachedBlock cb,
                                           long now)

Parameters:

cb -

Returns:

The block content of bc as a String minus the filename.

getLoadedCachedBlocksByFile

public static BlockCacheUtil.CachedBlocksByFile getLoadedCachedBlocksByFile(org.apache.hadoop.conf.Configuration conf,
                                                                            BlockCache bc)

Get a BlockCacheUtil.CachedBlocksByFile instance and load it up by iterating content in BlockCache.

Parameters:

conf - Used to read configurations

bc - Block Cache to iterate.

Returns:

Laoded up instance of CachedBlocksByFile