com.bigdata.rwstore

Class StorageStats.Bucket

java.lang.Object

com.bigdata.rwstore.StorageStats.Bucket

Enclosing class:

StorageStats

public class StorageStats.Bucket
extends Object

Constructor Summary

Constructors

Constructor and Description
StorageStats.Bucket(DataInputStream instr)
StorageStats.Bucket(int size, int startRange)

Method Summary

Methods

Modifier and Type	Method and Description
void	addAlocator()
void	addSlots(int slots)
void	allocate(int sze)
void	commit()
void	delete(int sze)
long	emptySlots()
int	meanAllocation() MeanAllocation: (total application bytes used across all allocations for this slot size) / SlotsAllocated
float	percentAllocations(long totalAllocations) %SlotsAllocated: SlotsAllocated/(Sum of SlotsAllocated across all slot sizes).
float	percentSlotsInuse(long totalInuse) %SlotsInUse: SlotsInUse / (total SlotsInUse across all slots sizes).
long	reservedSlots()
long	reservedStore() BytesReserved: The space reserved on the backing file for those allocation slots (AllocatorSlots * SlotsReserved).
void	reset()
float	slotChurn() SlotsChurn: A measure of how frequently slots of this size are re-allocated provided by slotsAllocated/slotsReserved.
float	slotsUnused() %SlotsUnused: The percentage of slots of this size which are not in use (1-(SlotsInUse/SlotsReserved)).
float	slotWaste() %SlotWaste: How well the application data fits in the slots (BytesAppData/(SlotsInUse*AllocatorSize)).
float	totalWaste(long total)
long	usedSlots() SlotsInUse: SlotsAllocated - SlotsRecycled (net slots in use for this slot size).
long	usedStore() BytesAppData: The #of bytes in the allocated slots which are used by application data (including the record checksum).
void	write(DataOutputStream outstr)

Methods inherited from class java.lang.Object

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

Constructor Detail

StorageStats.Bucket

public StorageStats.Bucket(int size,
                   int startRange)

StorageStats.Bucket

public StorageStats.Bucket(DataInputStream instr)
                    throws IOException

Throws:

IOException

Method Detail

write

public void write(DataOutputStream outstr)
           throws IOException

Throws:

IOException

commit

public void commit()

reset

public void reset()

delete

public void delete(int sze)

allocate

public void allocate(int sze)

addSlots

public void addSlots(int slots)

usedSlots

public long usedSlots()

SlotsInUse: SlotsAllocated - SlotsRecycled (net slots in use for this slot size).

emptySlots

public long emptySlots()

usedStore

public long usedStore()

BytesAppData: The #of bytes in the allocated slots which are used by application data (including the record checksum). See BLZG-1551 : The data reported here used to be bad since #m_sizeDeletes could not being tracked correctly in the StorageStats because we do not know the actual #of bytes in the slot that contain application data when we finally recycle the slot. See BLZG-1646 BytesAppData counter can not be tracked accurately and should be removed

slotWaste

public float slotWaste()

%SlotWaste: How well the application data fits in the slots (BytesAppData/(SlotsInUse*AllocatorSize)).

totalWaste

public float totalWaste(long total)

reservedStore

public long reservedStore()

BytesReserved: The space reserved on the backing file for those allocation slots (AllocatorSlots * SlotsReserved).

reservedSlots

public long reservedSlots()

addAlocator

public void addAlocator()

slotChurn

public float slotChurn()

SlotsChurn: A measure of how frequently slots of this size are re-allocated provided by slotsAllocated/slotsReserved. This metric is higher when there are more allocations made against a given #of slots reserved.

slotsUnused

public float slotsUnused()

%SlotsUnused: The percentage of slots of this size which are not in use (1-(SlotsInUse/SlotsReserved)).

percentAllocations

public float percentAllocations(long totalAllocations)

%SlotsAllocated: SlotsAllocated/(Sum of SlotsAllocated across all slot sizes).

Parameters:

totalAllocations - The #of allocations across all slot sizes.

Returns:

percentSlotsInuse

public float percentSlotsInuse(long totalInuse)

%SlotsInUse: SlotsInUse / (total SlotsInUse across all slots sizes).

Parameters:

totalInuse - The total of SlotsInUse across all slot sizes.

meanAllocation

public int meanAllocation()

MeanAllocation: (total application bytes used across all allocations for this slot size) / SlotsAllocated

Returns: