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| <div class="subTitle">org.apache.ignite.spi.failover</div> |
| <h2 title="Interface FailoverSpi" class="title">Interface FailoverSpi</h2> |
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| <dt>All Superinterfaces:</dt> |
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| <dt>All Known Implementing Classes:</dt> |
| <dd><a href="../../../../../org/apache/ignite/spi/failover/always/AlwaysFailoverSpi.html" title="class in org.apache.ignite.spi.failover.always">AlwaysFailoverSpi</a>, <a href="../../../../../org/apache/ignite/spi/failover/jobstealing/JobStealingFailoverSpi.html" title="class in org.apache.ignite.spi.failover.jobstealing">JobStealingFailoverSpi</a>, <a href="../../../../../org/apache/ignite/spi/failover/never/NeverFailoverSpi.html" title="class in org.apache.ignite.spi.failover.never">NeverFailoverSpi</a></dd> |
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| <pre>public interface <span class="strong">FailoverSpi</span> |
| extends <a href="../../../../../org/apache/ignite/spi/IgniteSpi.html" title="interface in org.apache.ignite.spi">IgniteSpi</a></pre> |
| <div class="block">Failover SPI provides developer with ability to supply custom logic for handling |
| failed execution of a grid job. Job execution can fail for a number of reasons: |
| <ul> |
| <li>Job execution threw an exception (runtime, assertion or error)</li> |
| <li>Node on which job was execution left topology (crashed or stopped)</li> |
| <li>Collision SPI on remote node cancelled a job before it got a chance to execute (job rejection).</li> |
| </ul> |
| In all cases failover SPI takes failed job (as failover context) and list of all |
| grid nodes and provides another node on which the job execution will be retried. |
| It is up to failover SPI to make sure that job is not mapped to the node it |
| failed on. The failed node can be retrieved from |
| <a href="../../../../../org/apache/ignite/compute/ComputeJobResult.html#getNode()"><code>GridFailoverContext.getJobResult().node()</code></a> |
| method. |
| <p> |
| Ignite comes with the following built-in failover SPI implementations: |
| <ul> |
| <li><a href="../../../../../org/apache/ignite/spi/failover/never/NeverFailoverSpi.html" title="class in org.apache.ignite.spi.failover.never"><code>NeverFailoverSpi</code></a></li> |
| <li><a href="../../../../../org/apache/ignite/spi/failover/always/AlwaysFailoverSpi.html" title="class in org.apache.ignite.spi.failover.always"><code>AlwaysFailoverSpi</code></a></li> |
| <li><a href="../../../../../org/apache/ignite/spi/failover/jobstealing/JobStealingFailoverSpi.html" title="class in org.apache.ignite.spi.failover.jobstealing"><code>JobStealingFailoverSpi</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> |
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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/failover/FailoverSpi.html#failover(org.apache.ignite.spi.failover.FailoverContext,%20java.util.List)">failover</a></strong>(<a href="../../../../../org/apache/ignite/spi/failover/FailoverContext.html" title="interface in org.apache.ignite.spi.failover">FailoverContext</a> ctx, |
| <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)</code> |
| <div class="block">This method is called when method <a href="../../../../../org/apache/ignite/compute/ComputeTask.html#result(org.apache.ignite.compute.ComputeJobResult,%20java.util.List)"><code>ComputeTask.result(org.apache.ignite.compute.ComputeJobResult, List)</code></a> returns |
| value <a href="../../../../../org/apache/ignite/compute/ComputeJobResultPolicy.html#FAILOVER"><code>ComputeJobResultPolicy.FAILOVER</code></a> policy indicating that the result of |
| job execution must be failed over.</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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| <h4>failover</h4> |
| <pre><a href="../../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a> failover(<a href="../../../../../org/apache/ignite/spi/failover/FailoverContext.html" title="interface in org.apache.ignite.spi.failover">FailoverContext</a> ctx, |
| <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)</pre> |
| <div class="block">This method is called when method <a href="../../../../../org/apache/ignite/compute/ComputeTask.html#result(org.apache.ignite.compute.ComputeJobResult,%20java.util.List)"><code>ComputeTask.result(org.apache.ignite.compute.ComputeJobResult, List)</code></a> returns |
| value <a href="../../../../../org/apache/ignite/compute/ComputeJobResultPolicy.html#FAILOVER"><code>ComputeJobResultPolicy.FAILOVER</code></a> policy indicating that the result of |
| job execution must be failed over. Implementation of this method should examine failover |
| context and choose one of the grid nodes from supplied <code>topology</code> to retry job execution |
| on it. For best performance it is advised that <a href="../../../../../org/apache/ignite/spi/failover/FailoverContext.html#getBalancedNode(java.util.List)"><code>FailoverContext.getBalancedNode(List)</code></a> |
| method is used to select node for execution of failed job.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>ctx</code> - Failover context.</dd><dd><code>top</code> - Collection of all grid nodes within task topology (may include failed node).</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>New node to route this job to or <code>null</code> if new node cannot be picked. |
| If job failover fails (returns <code>null</code>) the whole task will be failed.</dd></dl> |
| </li> |
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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>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>Ignite Fabric</b> </td> <td>: ver. <strong>1.7.0</strong> </td> </tr> <tr style="padding: 0; margin: 0"> <td> <b>Release Date</b> </td> <td>: August 1 2016 </td> </tr> </tbody> </table> </td> </tr> </table></small></p> |
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