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| <div class="subTitle">org.apache.ignite.spi.loadbalancing</div> |
| <h2 title="Interface LoadBalancingSpi" class="title">Interface LoadBalancingSpi</h2> |
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| <dt>All Superinterfaces:</dt> |
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| </dl> |
| <dl> |
| <dt>All Known Implementing Classes:</dt> |
| <dd><a href="../../../../../org/apache/ignite/spi/loadbalancing/adaptive/AdaptiveLoadBalancingSpi.html" title="class in org.apache.ignite.spi.loadbalancing.adaptive">AdaptiveLoadBalancingSpi</a>, <a href="../../../../../org/apache/ignite/spi/loadbalancing/roundrobin/RoundRobinLoadBalancingSpi.html" title="class in org.apache.ignite.spi.loadbalancing.roundrobin">RoundRobinLoadBalancingSpi</a>, <a href="../../../../../org/apache/ignite/spi/loadbalancing/weightedrandom/WeightedRandomLoadBalancingSpi.html" title="class in org.apache.ignite.spi.loadbalancing.weightedrandom">WeightedRandomLoadBalancingSpi</a></dd> |
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| <pre>public interface <span class="strong">LoadBalancingSpi</span> |
| extends <a href="../../../../../org/apache/ignite/spi/IgniteSpi.html" title="interface in org.apache.ignite.spi">IgniteSpi</a></pre> |
| <div class="block">Load balancing SPI provides the next best balanced node for job |
| execution. This SPI is used either implicitly or explicitly whenever |
| a job gets mapped to a node during <a href="../../../../../org/apache/ignite/compute/ComputeTask.html#map(java.util.List,%20T)"><code>ComputeTask.map(List, Object)</code></a> |
| invocation. |
| <h1 class="header">Coding Examples</h1> |
| If you are using <a href="../../../../../org/apache/ignite/compute/ComputeTaskSplitAdapter.html" title="class in org.apache.ignite.compute"><code>ComputeTaskSplitAdapter</code></a> then load balancing logic |
| is transparent to your code and is handled automatically by the adapter. |
| Here is an example of how your task could look: |
| <pre name="code" class="java"> |
| public class MyFooBarTask extends ComputeTaskSplitAdapter<Object,Object> { |
| @Override |
| protected Collection<? extends ComputeJob> split(int gridSize, Object arg) throws IgniteCheckedException { |
| List<MyFooBarJob> jobs = new ArrayList<MyFooBarJob>(gridSize); |
| |
| for (int i = 0; i < gridSize; i++) { |
| jobs.add(new MyFooBarJob(arg)); |
| } |
| |
| // Node assignment via load balancer |
| // happens automatically. |
| return jobs; |
| } |
| ... |
| } |
| </pre> |
| If you need more fine-grained control over how some jobs within task get mapped to a node |
| <i>and</i> use, for example, affinity load balancing for some other jobs within task, then you should use |
| <a href="../../../../../org/apache/ignite/compute/ComputeTaskAdapter.html" title="class in org.apache.ignite.compute"><code>ComputeTaskAdapter</code></a>. Here is an example of how your task could look. Note that in this |
| case we manually inject load balancer and use it to pick the best node. Doing it in |
| such way would allow user to map some jobs manually and for others use load balancer. |
| <pre name="code" class="java"> |
| public class MyFooBarTask extends ComputeTaskAdapter<String,String> { |
| // Inject load balancer. |
| @LoadBalancerResource |
| ComputeLoadBalancer balancer; |
| |
| // Map jobs to grid nodes. |
| public Map<? extends ComputeJob, ClusterNode> map(List<ClusterNode> subgrid, String arg) throws IgniteCheckedException { |
| Map<MyFooBarJob, ClusterNode> jobs = new HashMap<MyFooBarJob, ClusterNode>(subgrid.size()); |
| |
| // In more complex cases, you can actually do |
| // more complicated assignments of jobs to nodes. |
| for (int i = 0; i < subgrid.size(); i++) { |
| // Pick the next best balanced node for the job. |
| ComputeJob myJob = new MyFooBarJob(arg); |
| |
| jobs.put(myJob, balancer.getBalancedNode(myJob, null)); |
| } |
| |
| return jobs; |
| } |
| |
| // Aggregate results into one compound result. |
| public String reduce(List<ComputeJobResult> results) throws IgniteCheckedException { |
| // For the purpose of this example we simply |
| // concatenate string representation of every |
| // job result |
| StringBuilder buf = new StringBuilder(); |
| |
| for (ComputeJobResult res : results) { |
| // Append string representation of result |
| // returned by every job. |
| buf.append(res.getData().toString()); |
| } |
| |
| return buf.toString(); |
| } |
| } |
| </pre> |
| <p> |
| Ignite comes with the following load balancing SPI implementations out of the box: |
| <ul> |
| <li><a href="../../../../../org/apache/ignite/spi/loadbalancing/roundrobin/RoundRobinLoadBalancingSpi.html" title="class in org.apache.ignite.spi.loadbalancing.roundrobin"><code>RoundRobinLoadBalancingSpi</code></a> - default</li> |
| <li><a href="../../../../../org/apache/ignite/spi/loadbalancing/adaptive/AdaptiveLoadBalancingSpi.html" title="class in org.apache.ignite.spi.loadbalancing.adaptive"><code>AdaptiveLoadBalancingSpi</code></a></li> |
| <li><a href="../../../../../org/apache/ignite/spi/loadbalancing/weightedrandom/WeightedRandomLoadBalancingSpi.html" title="class in org.apache.ignite.spi.loadbalancing.weightedrandom"><code>WeightedRandomLoadBalancingSpi</code></a></li> |
| </ul> |
| <b>NOTE:</b> this SPI (i.e. methods in this interface) should never be used directly. SPIs provide |
| internal view on the subsystem and is used internally by Ignite kernal. In rare use cases when |
| access to a specific implementation of this SPI is required - an instance of this SPI can be obtained |
| via <a href="../../../../../org/apache/ignite/Ignite.html#configuration()"><code>Ignite.configuration()</code></a> method to check its configuration properties or call other non-SPI |
| methods. Note again that calling methods from this interface on the obtained instance can lead |
| to undefined behavior and explicitly not supported.</div> |
| </li> |
| </ul> |
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| <caption><span>Methods</span><span class="tabEnd"> </span></caption> |
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| <td class="colFirst"><code><a href="../../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a></code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/ignite/spi/loadbalancing/LoadBalancingSpi.html#getBalancedNode(org.apache.ignite.compute.ComputeTaskSession,%20java.util.List,%20org.apache.ignite.compute.ComputeJob)">getBalancedNode</a></strong>(<a href="../../../../../org/apache/ignite/compute/ComputeTaskSession.html" title="interface in org.apache.ignite.compute">ComputeTaskSession</a> ses, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>> top, |
| <a href="../../../../../org/apache/ignite/compute/ComputeJob.html" title="interface in org.apache.ignite.compute">ComputeJob</a> job)</code> |
| <div class="block">Gets balanced node for specified job within given task session.</div> |
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| <h3>Methods inherited from interface org.apache.ignite.spi.<a href="../../../../../org/apache/ignite/spi/IgniteSpi.html" title="interface in org.apache.ignite.spi">IgniteSpi</a></h3> |
| <code><a href="../../../../../org/apache/ignite/spi/IgniteSpi.html#getName()">getName</a>, <a href="../../../../../org/apache/ignite/spi/IgniteSpi.html#getNodeAttributes()">getNodeAttributes</a>, <a href="../../../../../org/apache/ignite/spi/IgniteSpi.html#onClientDisconnected(org.apache.ignite.lang.IgniteFuture)">onClientDisconnected</a>, <a href="../../../../../org/apache/ignite/spi/IgniteSpi.html#onClientReconnected(boolean)">onClientReconnected</a>, <a href="../../../../../org/apache/ignite/spi/IgniteSpi.html#onContextDestroyed()">onContextDestroyed</a>, <a href="../../../../../org/apache/ignite/spi/IgniteSpi.html#onContextInitialized(org.apache.ignite.spi.IgniteSpiContext)">onContextInitialized</a>, <a href="../../../../../org/apache/ignite/spi/IgniteSpi.html#spiStart(java.lang.String)">spiStart</a>, <a href="../../../../../org/apache/ignite/spi/IgniteSpi.html#spiStop()">spiStop</a></code></li> |
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| <a name="getBalancedNode(org.apache.ignite.compute.ComputeTaskSession, java.util.List, org.apache.ignite.compute.ComputeJob)"> |
| <!-- --> |
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| <h4>getBalancedNode</h4> |
| <pre><a href="../../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a> getBalancedNode(<a href="../../../../../org/apache/ignite/compute/ComputeTaskSession.html" title="interface in org.apache.ignite.compute">ComputeTaskSession</a> ses, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>> top, |
| <a href="../../../../../org/apache/ignite/compute/ComputeJob.html" title="interface in org.apache.ignite.compute">ComputeJob</a> job) |
| throws <a href="../../../../../org/apache/ignite/IgniteException.html" title="class in org.apache.ignite">IgniteException</a></pre> |
| <div class="block">Gets balanced node for specified job within given task session.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>ses</code> - Grid task session for currently executing task.</dd><dd><code>top</code> - Topology of task nodes from which to pick the best balanced node for given job.</dd><dd><code>job</code> - Job for which to pick the best balanced node.</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>Best balanced node for the given job within given task session.</dd> |
| <dt><span class="strong">Throws:</span></dt> |
| <dd><code><a href="../../../../../org/apache/ignite/IgniteException.html" title="class in org.apache.ignite">IgniteException</a></code> - If failed to get next balanced node.</dd></dl> |
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