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| <div class="subTitle">org.apache.ignite</div> |
| <h2 title="Interface DataRegionMetrics" class="title">Interface DataRegionMetrics</h2> |
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| <dt>All Known Subinterfaces:</dt> |
| <dd><a href="../../../org/apache/ignite/mxbean/DataRegionMetricsMXBean.html" title="interface in org.apache.ignite.mxbean">DataRegionMetricsMXBean</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public interface <span class="typeNameLabel">DataRegionMetrics</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/DataStorageConfiguration.html" title="class in org.apache.ignite.configuration"><code>DataStorageConfiguration</code></a>. |
| <p> |
| Since there are can be several memory regions configured with <a href="../../../org/apache/ignite/configuration/DataRegionConfiguration.html" title="class in org.apache.ignite.configuration"><code>DataRegionConfiguration</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#dataRegionMetrics--"><code>Ignite.dataRegionMetrics()</code></a> method. Note that |
| the method returns data region metrics snapshots rather than just in time memory state. |
| </li> |
| <li> |
| Second, all <a href="../../../org/apache/ignite/DataRegionMetrics.html" title="interface in org.apache.ignite"><code>DataRegionMetrics</code></a> of a local Apache Ignite node are visible through JMX interface. Refer to |
| <a href="../../../org/apache/ignite/mxbean/DataRegionMetricsMXBean.html" title="interface in org.apache.ignite.mxbean"><code>DataRegionMetricsMXBean</code></a> for more details. |
| </li> |
| </ol> |
| </p> |
| <p> |
| Data region 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/DataRegionConfiguration.html#setMetricsEnabled-boolean-"><code>DataRegionConfiguration.setMetricsEnabled(boolean)</code></a> configuration property or |
| <a href="../../../org/apache/ignite/mxbean/DataRegionMetricsMXBean.html#enableMetrics--"><code>DataRegionMetricsMXBean.enableMetrics()</code></a> method of a respective JMX bean.</div> |
| </li> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>float</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataRegionMetrics.html#getAllocationRate--">getAllocationRate</a></span>()</code> |
| <div class="block">Gets pages allocation rate of a memory region.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataRegionMetrics.html#getCheckpointBufferPages--">getCheckpointBufferPages</a></span>()</code> |
| <div class="block">Gets checkpoint buffer size in pages.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataRegionMetrics.html#getCheckpointBufferSize--">getCheckpointBufferSize</a></span>()</code> |
| <div class="block">Gets checkpoint buffer size in bytes.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataRegionMetrics.html#getDirtyPages--">getDirtyPages</a></span>()</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 id="i4" class="altColor"> |
| <td class="colFirst"><code>float</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataRegionMetrics.html#getEvictionRate--">getEvictionRate</a></span>()</code> |
| <div class="block">Gets eviction rate of a given memory region.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>float</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataRegionMetrics.html#getLargeEntriesPagesPercentage--">getLargeEntriesPagesPercentage</a></span>()</code> |
| <div class="block">Gets percentage of pages that are fully occupied by large entries that go beyond page size.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataRegionMetrics.html#getName--">getName</a></span>()</code> |
| <div class="block">A name of a memory region the metrics are collected for.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>float</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataRegionMetrics.html#getPagesFillFactor--">getPagesFillFactor</a></span>()</code> |
| <div class="block">Gets the percentage of the used space.</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataRegionMetrics.html#getPageSize--">getPageSize</a></span>()</code> |
| <div class="block">Gets memory page size.</div> |
| </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>float</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataRegionMetrics.html#getPagesReplaceAge--">getPagesReplaceAge</a></span>()</code> |
| <div class="block">Gets average age (in milliseconds) for the pages being replaced from the disk storage.</div> |
| </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code>float</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataRegionMetrics.html#getPagesReplaceRate--">getPagesReplaceRate</a></span>()</code> |
| <div class="block">Gets rate (pages per second) at which pages get replaced with other pages from persistent storage.</div> |
| </td> |
| </tr> |
| <tr id="i11" class="rowColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataRegionMetrics.html#getPhysicalMemoryPages--">getPhysicalMemoryPages</a></span>()</code> |
| <div class="block">Gets total number of pages currently loaded to the RAM.</div> |
| </td> |
| </tr> |
| <tr id="i12" class="altColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataRegionMetrics.html#getPhysicalMemorySize--">getPhysicalMemorySize</a></span>()</code> |
| <div class="block">Gets total size of pages loaded to the RAM.</div> |
| </td> |
| </tr> |
| <tr id="i13" class="rowColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataRegionMetrics.html#getTotalAllocatedPages--">getTotalAllocatedPages</a></span>()</code> |
| <div class="block">Gets a total number of allocated pages related to the data region.</div> |
| </td> |
| </tr> |
| <tr id="i14" class="altColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataRegionMetrics.html#getTotalAllocatedSize--">getTotalAllocatedSize</a></span>()</code> |
| <div class="block">Gets a total size of memory allocated in the data region.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ METHOD DETAIL ========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method.detail"> |
| <!-- --> |
| </a> |
| <h3>Method Detail</h3> |
| <a name="getName--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getName</h4> |
| <pre><a href="http://docs.oracle.com/javase/8/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="returnLabel">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 data region. 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="returnLabel">Returns:</span></dt> |
| <dd>Total number of allocated pages.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getTotalAllocatedSize--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getTotalAllocatedSize</h4> |
| <pre>long getTotalAllocatedSize()</pre> |
| <div class="block">Gets a total size of memory allocated in the data region. When persistence is disabled, this |
| metric shows the total size of pages in memory. When persistence is enabled, this metric shows the |
| total size of pages in memory and on disk.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Total size of memory allocated, in bytes.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getAllocationRate--"> |
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| </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="returnLabel">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="returnLabel">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="returnLabel">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 the used space.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The percentage of the used space.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getDirtyPages--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <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="returnLabel">Returns:</span></dt> |
| <dd>Current number of dirty pages.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getPagesReplaceRate--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <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="returnLabel">Returns:</span></dt> |
| <dd>Pages per second replace rate.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getPagesReplaceAge--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getPagesReplaceAge</h4> |
| <pre>float getPagesReplaceAge()</pre> |
| <div class="block">Gets average age (in milliseconds) for the pages being replaced from the disk storage. |
| This number effectively represents the average time between the moment when a page is read |
| from the disk and the time when the page is evicted. Note that if a page is never evicted, it does |
| not contribute to this metric. |
| This metric is enabled only for Ignite nodes with enabled persistence.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Replaced pages age in milliseconds.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getPhysicalMemoryPages--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <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/DataRegionMetrics.html#getTotalAllocatedPages--"><code>getTotalAllocatedPages()</code></a>.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Total number of pages loaded to RAM.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getPhysicalMemorySize--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getPhysicalMemorySize</h4> |
| <pre>long getPhysicalMemorySize()</pre> |
| <div class="block">Gets total size of pages loaded to the RAM. When persistence is disabled, this metric is equal |
| to <a href="../../../org/apache/ignite/DataRegionMetrics.html#getTotalAllocatedSize--"><code>getTotalAllocatedSize()</code></a>.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Total size of pages loaded to RAM in bytes.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getCheckpointBufferPages--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getCheckpointBufferPages</h4> |
| <pre>long getCheckpointBufferPages()</pre> |
| <div class="block">Gets checkpoint buffer size in pages.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Checkpoint buffer size in pages.</dd> |
| </dl> |
| </li> |
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| <h4>getCheckpointBufferSize</h4> |
| <pre>long getCheckpointBufferSize()</pre> |
| <div class="block">Gets checkpoint buffer size in bytes.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Checkpoint buffer size in bytes.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getPageSize--"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>getPageSize</h4> |
| <pre>int getPageSize()</pre> |
| <div class="block">Gets memory page size.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Page size in bytes.</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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