org.apache.ignite

Interface MemoryMetrics

All Known Subinterfaces:

MemoryMetricsMXBean

All Known Implementing Classes:

DataRegionMetricsAdapter

Deprecated.

Use DataRegionMetrics instead.

@Deprecated
public interface MemoryMetrics

This interface provides page memory related metrics of a specific Apache Ignite node. The overall page memory architecture is covered in MemoryConfiguration.

Since there are can be several memory regions configured with MemoryPolicyConfiguration on an individual Apache Ignite node, the metrics for every region will be collected and obtained separately.

There are two ways to get the metrics of an Apache Ignite node.

1. First, a collection of the metrics can be obtained through Ignite.dataRegionMetrics() ()} method. Note that the method returns memory metrics snapshots rather than just in time memory state.
2. Second, all MemoryMetrics of a local Apache Ignite node are visible through JMX interface. Refer to DataRegionMetricsMXBean for more details.

Memory metrics collection is not a free operation and might affect performance of an application. This is the reason why the metrics are turned off by default. To enable the collection you can use both MemoryPolicyConfiguration.setMetricsEnabled(boolean) configuration property or DataRegionMetricsMXBean.enableMetrics() method of a respective JMX bean.

Method Summary

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

Method Detail

getName

String getName()

Deprecated.

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

Returns:

Name of the memory region.

getTotalAllocatedPages

long getTotalAllocatedPages()

Deprecated.

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.

Returns:

Total number of allocated pages.

getAllocationRate

float getAllocationRate()

Deprecated.

Gets pages allocation rate of a memory region.

Returns:

Number of allocated pages per second.

getEvictionRate

float getEvictionRate()

Deprecated.

Gets eviction rate of a given memory region.

Returns:

Number of evicted pages per second.

getLargeEntriesPagesPercentage

float getLargeEntriesPagesPercentage()

Deprecated.

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.

Returns:

Percentage of pages fully occupied by large entities.

getPagesFillFactor

float getPagesFillFactor()

Deprecated.

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

Returns:

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

getDirtyPages

long getDirtyPages()

Deprecated.

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.

Returns:

Current number of dirty pages.

getPagesReplaceRate

float getPagesReplaceRate()

Deprecated.

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.

Returns:

Pages per second replace rate.

getPhysicalMemoryPages

long getPhysicalMemoryPages()

Deprecated.

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

Returns:

Total number of pages loaded to RAM.