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| <li>Summary: </li> |
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| <div class="subTitle">org.apache.ignite</div> |
| <h2 title="Interface MemoryMetrics" class="title">Interface MemoryMetrics</h2> |
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| <dt>All Known Subinterfaces:</dt> |
| <dd><a href="../../../org/apache/ignite/mxbean/MemoryMetricsMXBean.html" title="interface in org.apache.ignite.mxbean">MemoryMetricsMXBean</a></dd> |
| </dl> |
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| <br> |
| <pre>public interface <span class="strong">MemoryMetrics</span></pre> |
| <div class="block">This interface provides page memory related metrics of a specific Apache Ignite node. The overall page memory |
| architecture is covered in <a href="../../../org/apache/ignite/configuration/MemoryConfiguration.html" title="class in org.apache.ignite.configuration"><code>MemoryConfiguration</code></a>. |
| <p> |
| Since there are can be several memory regions configured with <a href="../../../org/apache/ignite/configuration/MemoryPolicyConfiguration.html" title="class in org.apache.ignite.configuration"><code>MemoryPolicyConfiguration</code></a> on an individual |
| Apache Ignite node, the metrics for every region will be collected and obtained separately. |
| <p> |
| There are two ways to get the metrics of an Apache Ignite node. |
| <ol> |
| <li> |
| First, a collection of the metrics can be obtained through <a href="../../../org/apache/ignite/Ignite.html#memoryMetrics()"><code>Ignite.memoryMetrics()</code></a> method. Note that |
| the method returns memory metrics snapshots rather than just in time memory state. |
| </li> |
| <li> |
| Second, all <a href="../../../org/apache/ignite/MemoryMetrics.html" title="interface in org.apache.ignite"><code>MemoryMetrics</code></a> of a local Apache Ignite node are visible through JMX interface. Refer to |
| <a href="../../../org/apache/ignite/mxbean/MemoryMetricsMXBean.html" title="interface in org.apache.ignite.mxbean"><code>MemoryMetricsMXBean</code></a> for more details. |
| </li> |
| </ol> |
| </p> |
| <p> |
| 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 |
| <a href="../../../org/apache/ignite/configuration/MemoryPolicyConfiguration.html#setMetricsEnabled(boolean)"><code>MemoryPolicyConfiguration.setMetricsEnabled(boolean)</code></a> configuration property or |
| <a href="../../../org/apache/ignite/mxbean/MemoryMetricsMXBean.html#enableMetrics()"><code>MemoryMetricsMXBean.enableMetrics()</code></a> method of a respective JMX bean.</div> |
| </li> |
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| <h3>Method Summary</h3> |
| <table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span>Methods</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>float</code></td> |
| <td class="colLast"><code><strong><a href="../../../org/apache/ignite/MemoryMetrics.html#getAllocationRate()">getAllocationRate</a></strong>()</code> |
| <div class="block">Gets pages allocation rate of a memory region.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><strong><a href="../../../org/apache/ignite/MemoryMetrics.html#getDirtyPages()">getDirtyPages</a></strong>()</code> |
| <div class="block">Gets the number of dirty pages (pages which contents is different from the current persistent storage state).</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>float</code></td> |
| <td class="colLast"><code><strong><a href="../../../org/apache/ignite/MemoryMetrics.html#getEvictionRate()">getEvictionRate</a></strong>()</code> |
| <div class="block">Gets eviction rate of a given memory region.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>float</code></td> |
| <td class="colLast"><code><strong><a href="../../../org/apache/ignite/MemoryMetrics.html#getLargeEntriesPagesPercentage()">getLargeEntriesPagesPercentage</a></strong>()</code> |
| <div class="block">Gets percentage of pages that are fully occupied by large entries that go beyond page size.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><strong><a href="../../../org/apache/ignite/MemoryMetrics.html#getName()">getName</a></strong>()</code> |
| <div class="block">A name of a memory region the metrics are collected for.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>float</code></td> |
| <td class="colLast"><code><strong><a href="../../../org/apache/ignite/MemoryMetrics.html#getPagesFillFactor()">getPagesFillFactor</a></strong>()</code> |
| <div class="block">Gets the percentage of space that is still free and can be filled in.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>float</code></td> |
| <td class="colLast"><code><strong><a href="../../../org/apache/ignite/MemoryMetrics.html#getPagesReplaceRate()">getPagesReplaceRate</a></strong>()</code> |
| <div class="block">Gets rate (pages per second) at which pages get replaced with other pages from persistent storage.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><strong><a href="../../../org/apache/ignite/MemoryMetrics.html#getPhysicalMemoryPages()">getPhysicalMemoryPages</a></strong>()</code> |
| <div class="block">Gets total number of pages currently loaded to the RAM.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><strong><a href="../../../org/apache/ignite/MemoryMetrics.html#getTotalAllocatedPages()">getTotalAllocatedPages</a></strong>()</code> |
| <div class="block">Gets a total number of allocated pages related to the memory policy.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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| <h3>Method Detail</h3> |
| <a name="getName()"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getName</h4> |
| <pre><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> getName()</pre> |
| <div class="block">A name of a memory region the metrics are collected for.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>Name of the memory region.</dd></dl> |
| </li> |
| </ul> |
| <a name="getTotalAllocatedPages()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getTotalAllocatedPages</h4> |
| <pre>long getTotalAllocatedPages()</pre> |
| <div class="block">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.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>Total number of allocated pages.</dd></dl> |
| </li> |
| </ul> |
| <a name="getAllocationRate()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getAllocationRate</h4> |
| <pre>float getAllocationRate()</pre> |
| <div class="block">Gets pages allocation rate of a memory region.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>Number of allocated pages per second.</dd></dl> |
| </li> |
| </ul> |
| <a name="getEvictionRate()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getEvictionRate</h4> |
| <pre>float getEvictionRate()</pre> |
| <div class="block">Gets eviction rate of a given memory region.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>Number of evicted pages per second.</dd></dl> |
| </li> |
| </ul> |
| <a name="getLargeEntriesPagesPercentage()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getLargeEntriesPagesPercentage</h4> |
| <pre>float getLargeEntriesPagesPercentage()</pre> |
| <div class="block">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.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>Percentage of pages fully occupied by large entities.</dd></dl> |
| </li> |
| </ul> |
| <a name="getPagesFillFactor()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getPagesFillFactor</h4> |
| <pre>float getPagesFillFactor()</pre> |
| <div class="block">Gets the percentage of space that is still free and can be filled in.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>The percentage of space that is still free and can be filled in.</dd></dl> |
| </li> |
| </ul> |
| <a name="getDirtyPages()"> |
| <!-- --> |
| </a> |
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| <h4>getDirtyPages</h4> |
| <pre>long getDirtyPages()</pre> |
| <div class="block">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.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>Current number of dirty pages.</dd></dl> |
| </li> |
| </ul> |
| <a name="getPagesReplaceRate()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
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| <h4>getPagesReplaceRate</h4> |
| <pre>float getPagesReplaceRate()</pre> |
| <div class="block">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.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>Pages per second replace rate.</dd></dl> |
| </li> |
| </ul> |
| <a name="getPhysicalMemoryPages()"> |
| <!-- --> |
| </a> |
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| <h4>getPhysicalMemoryPages</h4> |
| <pre>long getPhysicalMemoryPages()</pre> |
| <div class="block">Gets total number of pages currently loaded to the RAM. When persistence is disabled, this metric is equal |
| to <a href="../../../org/apache/ignite/MemoryMetrics.html#getTotalAllocatedPages()"><code>getTotalAllocatedPages()</code></a>.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>Total number of pages loaded to RAM.</dd></dl> |
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| <p class="legalCopy"><small><table width="100%" border="0" cellspacing=0 cellpadding=0 style="padding: 5px"> <tr> <td> <table style="padding-left: 0; margin: 0"> <tbody style="padding: 0; margin: 0"> <tr style="padding: 0; margin: 0"> <td> <a target=_blank href="https://ignite.apache.org"><nobr>2017 Copyright © Apache Software Foundation</nobr></a> </td> </tr> </tbody> </table> </td> <td width="100%" align="right" valign="center"> <a href="https://twitter.com/ApacheIgnite" class="twitter-follow-button" data-show-count="false" data-size="large">Follow @ApacheIgnite</a> </td> </tr> <tr> <td colspan="2" valign="top" align="left"> <table style="padding-left: 0; margin: 0"> <tbody style="padding: 0; margin: 0"> <tr style="padding: 0; margin: 0"> <td> <b>Ignite Fabric</b> </td> <td>: ver. <strong>2.1.0</strong> </td> </tr> <tr style="padding: 0; margin: 0"> <td> <b>Release Date</b> </td> <td>: July 20 2017 </td> </tr> </tbody> </table> </td> </tr> </table></small></p> |
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