org.apache.ignite.internal.processors.cache.persistence

Class MemoryMetricsSnapshot

java.lang.Object

org.apache.ignite.internal.processors.cache.persistence.MemoryMetricsSnapshot

All Implemented Interfaces:

MemoryMetrics

public class MemoryMetricsSnapshot
extends Object
implements MemoryMetrics

Constructor Summary

Constructors

Constructor and Description
MemoryMetricsSnapshot(MemoryMetrics metrics)

Method Summary

Methods

Modifier and Type	Method and Description
float	getAllocationRate() Gets pages allocation rate of a memory region.
long	getDirtyPages() Gets the number of dirty pages (pages which contents is different from the current persistent storage state).
float	getEvictionRate() Gets eviction rate of a given memory region.
float	getLargeEntriesPagesPercentage() Gets percentage of pages that are fully occupied by large entries that go beyond page size.
String	getName() A name of a memory region the metrics are collected for.
float	getPagesFillFactor() Gets the percentage of space that is still free and can be filled in.
float	getPagesReplaceRate() Gets rate (pages per second) at which pages get replaced with other pages from persistent storage.
long	getPhysicalMemoryPages() Gets total number of pages currently loaded to the RAM.
long	getTotalAllocatedPages() Gets a total number of allocated pages related to the memory policy.

Methods inherited from class java.lang.Object

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

Constructor Detail

MemoryMetricsSnapshot

public MemoryMetricsSnapshot(MemoryMetrics metrics)

Parameters:

metrics - Metrics instance to take a copy.

Method Detail

getName

public String getName()

A name of a memory region the metrics are collected for.

Specified by:

getName in interface MemoryMetrics

Returns:

Name of the memory region.

getTotalAllocatedPages

public long getTotalAllocatedPages()

Gets a total number of allocated pages related to the memory policy. When persistence is disabled, this metric shows the total number of pages in memory. When persistence is enabled, this metric shows the total number of pages in memory and on disk.

Specified by:

getTotalAllocatedPages in interface MemoryMetrics

Returns:

Total number of allocated pages.

getAllocationRate

public float getAllocationRate()

Gets pages allocation rate of a memory region.

Specified by:

getAllocationRate in interface MemoryMetrics

Returns:

Number of allocated pages per second.

getEvictionRate

public float getEvictionRate()

Gets eviction rate of a given memory region.

Specified by:

getEvictionRate in interface MemoryMetrics

Returns:

Number of evicted pages per second.

getLargeEntriesPagesPercentage

public float getLargeEntriesPagesPercentage()

Gets percentage of pages that are fully occupied by large entries that go beyond page size. The large entities are split into fragments in a way so that each fragment can fit into a single page.

Specified by:

getLargeEntriesPagesPercentage in interface MemoryMetrics

Returns:

Percentage of pages fully occupied by large entities.

getPagesFillFactor

public float getPagesFillFactor()

Gets the percentage of space that is still free and can be filled in.

Specified by:

getPagesFillFactor in interface MemoryMetrics

Returns:

The percentage of space that is still free and can be filled in.

getDirtyPages

public long getDirtyPages()

Gets the number of dirty pages (pages which contents is different from the current persistent storage state). This metric is enabled only for Ignite nodes with enabled persistence.

Specified by:

getDirtyPages in interface MemoryMetrics

Returns:

Current number of dirty pages.

getPagesReplaceRate

public float getPagesReplaceRate()

Gets rate (pages per second) at which pages get replaced with other pages from persistent storage. The rate effectively represents the rate at which pages get 'evicted' in favor of newly needed pages. This metric is enabled only for Ignite nodes with enabled persistence.

Specified by:

getPagesReplaceRate in interface MemoryMetrics

Returns:

Pages per second replace rate.

getPhysicalMemoryPages

public long getPhysicalMemoryPages()

Gets total number of pages currently loaded to the RAM. When persistence is disabled, this metric is equal to MemoryMetrics.getTotalAllocatedPages().

Specified by:

getPhysicalMemoryPages in interface MemoryMetrics

Returns:

Total number of pages loaded to RAM.