org.apache.hadoop.hbase.io.hfile

Class BlockCacheUtil.CachedBlocksByFile

java.lang.Object

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

Enclosing class:

BlockCacheUtil

public static class BlockCacheUtil.CachedBlocksByFile
extends Object

Use one of these to keep a running account of cached blocks by file. Throw it away when done. This is different than metrics in that it is stats on current state of a cache. See getLoadedCachedBlocksByFile

Field Summary

Fields

Modifier and Type	Field and Description
private NavigableMap<String,NavigableSet<CachedBlock>>	cachedBlockByFile Map by filename.
private int	count
private int	dataBlockCount
private long	dataSize
static int	DEFAULT_MAX
(package private) FastLongHistogram	hist
private int	max How many blocks to look at before we give up.
private long	now
private long	size

Constructor Summary

Constructors

Constructor and Description
CachedBlocksByFile()
CachedBlocksByFile(org.apache.hadoop.conf.Configuration c)

Method Summary

Modifier and Type	Method and Description
AgeSnapshot	getAgeInCacheSnapshot()
NavigableMap<String,NavigableSet<CachedBlock>>	getCachedBlockStatsByFile()
int	getCount()
int	getDataCount()
long	getDataSize()
long	getSize()
boolean	isFull()
String	toString()
boolean	update(CachedBlock cb)

Methods inherited from class java.lang.Object

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

Field Detail

count

private int count

dataBlockCount

private int dataBlockCount

size

private long size

dataSize

private long dataSize

now

private final long now

max

private final int max

How many blocks to look at before we give up. There could be many millions of blocks. We don't want the ui to freeze while we run through 1B blocks... users will think hbase dead. UI displays warning in red when stats are incomplete.

DEFAULT_MAX

public static final int DEFAULT_MAX

See Also:

Constant Field Values

cachedBlockByFile

private NavigableMap<String,NavigableSet<CachedBlock>> cachedBlockByFile

Map by filename. use concurent utils because we want our Map and contained blocks sorted.

hist

FastLongHistogram hist

Constructor Detail

CachedBlocksByFile

CachedBlocksByFile()

CachedBlocksByFile

CachedBlocksByFile(org.apache.hadoop.conf.Configuration c)

Method Detail

update

public boolean update(CachedBlock cb)

Parameters:

cb -

Returns:

True if full.... if we won't be adding any more.

isFull

public boolean isFull()

Returns:

True if full; i.e. there are more items in the cache but we only loaded up the maximum set in configuration hbase.ui.blockcache.by.file.max (Default: DEFAULT_MAX).

getCachedBlockStatsByFile

public NavigableMap<String,NavigableSet<CachedBlock>> getCachedBlockStatsByFile()

getCount

public int getCount()

Returns:

count of blocks in the cache

getDataCount

public int getDataCount()

getSize

public long getSize()

Returns:

size of blocks in the cache

getDataSize

public long getDataSize()

Returns:

Size of data.

getAgeInCacheSnapshot

public AgeSnapshot getAgeInCacheSnapshot()

toString

public String toString()

Overrides:

toString in class Object