com.bigdata.rwstore

Class RWStore.StoreCounters<T extends RWStore.StoreCounters<T>>

java.lang.Object

com.bigdata.counters.striped.StripedCounters<T>

com.bigdata.rwstore.RWStore.StoreCounters<T>

Type Parameters:

T -

Enclosing class:

RWStore

public static class RWStore.StoreCounters<T extends RWStore.StoreCounters<T>>
extends StripedCounters<T>

Striped performance counters for IRawStore access, including operations that read or write through to the underlying media.

Note: The performance counters for writes to the disk are reported by the WriteCacheService. The RWStore never writes directly onto the disk (other than the root blocks).

Author:

Bryan Thompson

Field Summary

Fields

Modifier and Type	Field and Description
long	bufferDataBytes buffer counters
long	bufferDataWrites
long	bufferFileWrites
long	bytesRead #of bytes read.
long	bytesReadFromDisk #of bytes that have been read from the disk.
long	bytesWritten #of bytes written.
long	checksumErrorCount The #of checksum errors while reading on the local disk.
long	elapsedDiskReadNanos Total elapsed time for reading on the disk.
long	elapsedReadNanos Total elapsed time for reads.
long	elapsedWriteNanos Total elapsed time for writes.
long	maxReadSize The size of the largest record read.
long	maxWriteSize The size of the largest record written.
long	ndiskRead #of read requests that read through to the backing file.
long	nforce #of times the data were forced to the disk.
long	nreads #of read requests.
long	nreopen #of times the file has been reopened after it was closed by an interrupt.
long	ntruncate #of times the length of the file was changed (typically, extended).
long	nwriteRootBlock #of times one of the root blocks has been written.
long	nwrites #of write requests.

Fields inherited from class com.bigdata.counters.striped.StripedCounters

batchSize, locks, n, parent

Constructor Summary

Constructors

Constructor and Description
RWStore.StoreCounters()
RWStore.StoreCounters(int batchSize)
RWStore.StoreCounters(int nstripes, int batchSize)

Method Summary

Methods

Modifier and Type	Method and Description
void	add(T o) Adds counters to the current counters.
void	clear() Clear the counter values back to zero.
CounterSet	getCounters() Return a new, empty CounterSet.
T	subtract(T o) Returns a new StripedCounters containing the current counter values minus the given counter values.

Methods inherited from class com.bigdata.counters.striped.StripedCounters

acquire, release, toString

Methods inherited from class java.lang.Object

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

Field Detail

nreads

public volatile long nreads

#of read requests.

ndiskRead

public volatile long ndiskRead

#of read requests that read through to the backing file.

bytesRead

public volatile long bytesRead

#of bytes read.

bytesReadFromDisk

public volatile long bytesReadFromDisk

#of bytes that have been read from the disk.

elapsedReadNanos

public volatile long elapsedReadNanos

Total elapsed time for reads.

elapsedDiskReadNanos

public volatile long elapsedDiskReadNanos

Total elapsed time for reading on the disk.

checksumErrorCount

public volatile long checksumErrorCount

The #of checksum errors while reading on the local disk.

nwrites

public volatile long nwrites

#of write requests.

maxReadSize

public volatile long maxReadSize

The size of the largest record read.

maxWriteSize

public volatile long maxWriteSize

The size of the largest record written.

bytesWritten

public volatile long bytesWritten

#of bytes written.

elapsedWriteNanos

public volatile long elapsedWriteNanos

Total elapsed time for writes.

nforce

public volatile long nforce

#of times the data were forced to the disk.

ntruncate

public volatile long ntruncate

#of times the length of the file was changed (typically, extended).

nreopen

public volatile long nreopen

#of times the file has been reopened after it was closed by an interrupt.

nwriteRootBlock

public volatile long nwriteRootBlock

#of times one of the root blocks has been written.

bufferDataBytes

public volatile long bufferDataBytes

buffer counters

bufferDataWrites

public volatile long bufferDataWrites

bufferFileWrites

public volatile long bufferFileWrites

Constructor Detail

RWStore.StoreCounters

public RWStore.StoreCounters()

RWStore.StoreCounters

public RWStore.StoreCounters(int batchSize)

RWStore.StoreCounters

public RWStore.StoreCounters(int nstripes,
                     int batchSize)

Method Detail

add

public void add(T o)

Description copied from class: StripedCounters

Adds counters to the current counters.

Overrides:

add in class StripedCounters<T extends RWStore.StoreCounters<T>>

Parameters:

o - The other counters.

subtract

public T subtract(T o)

Description copied from class: StripedCounters

Returns a new StripedCounters containing the current counter values minus the given counter values.

Overrides:

subtract in class StripedCounters<T extends RWStore.StoreCounters<T>>

Parameters:

o - The other counters.

Returns:

A new set of counters.

clear

public void clear()

Description copied from class: StripedCounters

Clear the counter values back to zero.

Overrides:

clear in class StripedCounters<T extends RWStore.StoreCounters<T>>

getCounters

public CounterSet getCounters()

Description copied from class: StripedCounters

Return a new, empty CounterSet. This method must be extended to attach the various performance counters to that CounterSet.

Overrides:

getCounters in class StripedCounters<T extends RWStore.StoreCounters<T>>