BucketAllocator (Apache HBase 1.1.7 API)

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java.lang.Object
- org.apache.hadoop.hbase.io.hfile.bucket.BucketAllocator

```
@InterfaceAudience.Private
public final class BucketAllocator
extends Object
```
This class is used to allocate a block with specified size and free the block when evicting. It manages an array of buckets, each bucket is associated with a size and caches elements up to this size. For a completely empty bucket, this size could be re-specified dynamically. This class is not thread safe.

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class BucketAllocator.Bucket

Field Summary

Fields
Modifier and Type Field and Description

static int FEWEST_ITEMS_IN_BUCKET

Method Summary

Methods
Modifier and Type	Method and Description
`long`	`allocateBlock(int blockSize)` Allocate a block with specified size.
`int`	`freeBlock(long offset)` Free a block with the offset
`long`	`freeBlock(long[] freeList)`
`BucketAllocator.Bucket[]`	`getBuckets()`
`long`	`getFreeSize()`
`long`	`getTotalSize()`
`long`	`getUsedSize()`
`org.apache.hadoop.hbase.io.hfile.bucket.BucketAllocator.BucketSizeInfo`	`roundUpToBucketSizeInfo(int blockSize)` Round up the given block size to bucket size, and get the corresponding BucketSizeInfo
`int`	`sizeIndexOfAllocation(long offset)`
`int`	`sizeOfAllocation(long offset)`
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail
- FEWEST_ITEMS_IN_BUCKET
```
public static final int FEWEST_ITEMS_IN_BUCKET
```
  See Also:
  Constant Field Values

Method Detail

roundUpToBucketSizeInfo

public org.apache.hadoop.hbase.io.hfile.bucket.BucketAllocator.BucketSizeInfo roundUpToBucketSizeInfo(int blockSize)

Round up the given block size to bucket size, and get the corresponding BucketSizeInfo

toString
```
public String toString()
```
Overrides:

toString in class Object

getUsedSize
```
public long getUsedSize()
```

getFreeSize
```
public long getFreeSize()
```

getTotalSize
```
public long getTotalSize()
```

allocateBlock
```
public long allocateBlock(int blockSize)
                   throws CacheFullException,
                          BucketAllocatorException
```
Allocate a block with specified size. Return the offset

Parameters:
blockSize - size of block

Returns:
the offset in the IOEngine

Throws:

BucketAllocatorException,CacheFullException

CacheFullException

BucketAllocatorException

freeBlock
```
public int freeBlock(long offset)
```
Free a block with the offset

Parameters:
offset - block's offset

Returns:
size freed

sizeIndexOfAllocation

public int sizeIndexOfAllocation(long offset)

sizeOfAllocation

public int sizeOfAllocation(long offset)

getBuckets

public BucketAllocator.Bucket[] getBuckets()

freeBlock

public long freeBlock(long[] freeList)

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