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| <div class="subTitle">org.apache.ignite.spi.loadbalancing.adaptive</div> |
| <h2 title="Interface AdaptiveLoadProbe" class="title">Interface AdaptiveLoadProbe</h2> |
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| <dt>All Known Implementing Classes:</dt> |
| <dd><a href="../../../../../../org/apache/ignite/spi/loadbalancing/adaptive/AdaptiveCpuLoadProbe.html" title="class in org.apache.ignite.spi.loadbalancing.adaptive">AdaptiveCpuLoadProbe</a>, <a href="../../../../../../org/apache/ignite/spi/loadbalancing/adaptive/AdaptiveJobCountLoadProbe.html" title="class in org.apache.ignite.spi.loadbalancing.adaptive">AdaptiveJobCountLoadProbe</a>, <a href="../../../../../../org/apache/ignite/spi/loadbalancing/adaptive/AdaptiveProcessingTimeLoadProbe.html" title="class in org.apache.ignite.spi.loadbalancing.adaptive">AdaptiveProcessingTimeLoadProbe</a></dd> |
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| <pre>public interface <span class="strong">AdaptiveLoadProbe</span></pre> |
| <div class="block">Pluggable implementation of node load probing. Implementations |
| of this can be configured to be used with <a href="../../../../../../org/apache/ignite/spi/loadbalancing/adaptive/AdaptiveLoadBalancingSpi.html" title="class in org.apache.ignite.spi.loadbalancing.adaptive"><code>AdaptiveLoadBalancingSpi</code></a> |
| by setting <a href="../../../../../../org/apache/ignite/spi/loadbalancing/adaptive/AdaptiveLoadBalancingSpi.html#setLoadProbe(org.apache.ignite.spi.loadbalancing.adaptive.AdaptiveLoadProbe)"><code>AdaptiveLoadBalancingSpi.setLoadProbe(AdaptiveLoadProbe)</code></a> |
| configuration parameter. |
| <p> |
| Note that if <a href="../../../../../../org/apache/ignite/spi/loadbalancing/adaptive/AdaptiveLoadProbe.html#getLoad(org.apache.ignite.cluster.ClusterNode, int)"><code>getLoad(org.apache.ignite.cluster.ClusterNode, int)</code></a> returns a value of <code>0</code>, |
| then implementation will assume that load value is simply not available and |
| will try to calculate an average of load values for other nodes. If such |
| average cannot be obtained (all node load values are <code>0</code>), then a value |
| of <code>1</code> will be used. |
| <p> |
| By default, <a href="../../../../../../org/apache/ignite/spi/loadbalancing/adaptive/AdaptiveCpuLoadProbe.html" title="class in org.apache.ignite.spi.loadbalancing.adaptive"><code>AdaptiveCpuLoadProbe</code></a> probing implementation is used. |
| <p> |
| <h1 class="header">Example</h1> |
| Here is an example of how probing can be implemented to use |
| number of active and waiting jobs as probing mechanism: |
| <pre name="code" class="java"> |
| public class FooBarLoadProbe implements GridAdaptiveLoadProbe { |
| // Flag indicating whether to use average value or current. |
| private int useAvg = true; |
| |
| public FooBarLoadProbe(boolean useAvg) { |
| this.useAvg = useAvg; |
| } |
| |
| // Calculate load based on number of active and waiting jobs. |
| public double getLoad(GridNode node, int jobsSentSinceLastUpdate) { |
| GridNodeMetrics metrics = node.getMetrics(); |
| |
| if (useAvg) { |
| double load = metrics.getAverageActiveJobs() + metrics.getAverageWaitingJobs(); |
| |
| if (load > 0) { |
| return load; |
| } |
| } |
| |
| return metrics.getCurrentActiveJobs() + metrics.getCurrentWaitingJobs(); |
| } |
| } |
| </pre> |
| Below is an example of how a probe shown above would be configured with <a href="../../../../../../org/apache/ignite/spi/loadbalancing/adaptive/AdaptiveLoadBalancingSpi.html" title="class in org.apache.ignite.spi.loadbalancing.adaptive"><code>AdaptiveLoadBalancingSpi</code></a> |
| SPI: |
| <pre name="code" class="xml"> |
| <property name="loadBalancingSpi"> |
| <bean class="org.apache.ignite.spi.loadBalancing.adaptive.GridAdaptiveLoadBalancingSpi"> |
| <property name="loadProbe"> |
| <bean class="foo.bar.FooBarLoadProbe"> |
| <constructor-arg value="true"/> |
| </bean> |
| </property> |
| </bean> |
| </property> |
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| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../../org/apache/ignite/spi/loadbalancing/adaptive/AdaptiveLoadProbe.html#getLoad(org.apache.ignite.cluster.ClusterNode, int)">getLoad</a></strong>(<a href="../../../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a> node, |
| int jobsSentSinceLastUpdate)</code> |
| <div class="block">Calculates load value for a given node.</div> |
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| <h4>getLoad</h4> |
| <pre>double getLoad(<a href="../../../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a> node, |
| int jobsSentSinceLastUpdate)</pre> |
| <div class="block">Calculates load value for a given node. Specific implementations would |
| usually take into account some of the values provided by |
| <a href="../../../../../../org/apache/ignite/cluster/ClusterNode.html#metrics()"><code>ClusterNode.metrics()</code></a> method. For example, load can be calculated |
| based on job execution time or number of active jobs, or CPU/Heap utilization. |
| <p> |
| Note that if this method returns a value of <code>0</code>, |
| then implementation will assume that load value is simply not available and |
| will try to calculate an average of load values for other nodes. If such |
| average cannot be obtained (all node load values are <code>0</code>), then a value |
| of <code>1</code> will be used.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>node</code> - Grid node to calculate load for.</dd><dd><code>jobsSentSinceLastUpdate</code> - Number of jobs sent to this node since |
| last metrics update. This parameter may be useful when |
| implementation takes into account the current job count on a node.</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>Non-negative load value for the node (zero and above).</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://incubator.apache.org/projects/ignite.html"><nobr>2015 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> <script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+'://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js,fjs);}}(document, 'script', 'twitter-wjs');</script> </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>Apache Ignite Fabric</b> </td> <td>: ver. <strong>1.0.0-RC3</strong> </td> </tr> <tr style="padding: 0; margin: 0"> <td> <b>Release Date</b> </td> <td>: March 24 2015 </td> </tr> </tbody> </table> </td> </tr> </table></small></p> |
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