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<div class="subTitle">org.apache.ignite.plugin.segmentation</div>
<h2 title="Interface GridSegmentationResolver" class="title">Interface GridSegmentationResolver</h2>
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<pre>public interface <span class="strong">GridSegmentationResolver</span>
extends <a href="http://docs.oracle.com/javase/7/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></pre>
<div class="block">This is interface for segmentation (a.k.a "split-brain" problem) resolvers.
<p>
Each segmentation resolver checks segment for validity, using its inner logic.
Typically, resolver should run light-weight single check (i.e. one IP address or
one shared folder). Compound segment checks may be performed using several
resolvers.
<p>
Note that Ignite support a logical segmentation and not limited to network
related segmentation only. For example, a particular segmentation resolver
can check for specific application or service present on the network and
mark the topology as segmented in case it is not available. In other words
you can equate the service outage with network outage via segmentation resolution
and employ the unified approach in dealing with these types of problems.</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../org/apache/ignite/configuration/IgniteConfiguration.html#getSegmentationResolvers()"><code>IgniteConfiguration.getSegmentationResolvers()</code></a>,
<a href="../../../../../org/apache/ignite/configuration/IgniteConfiguration.html#getSegmentationPolicy()"><code>IgniteConfiguration.getSegmentationPolicy()</code></a>,
<a href="../../../../../org/apache/ignite/configuration/IgniteConfiguration.html#getSegmentCheckFrequency()"><code>IgniteConfiguration.getSegmentCheckFrequency()</code></a>,
<a href="../../../../../org/apache/ignite/configuration/IgniteConfiguration.html#isAllSegmentationResolversPassRequired()"><code>IgniteConfiguration.isAllSegmentationResolversPassRequired()</code></a>,
<a href="../../../../../org/apache/ignite/configuration/IgniteConfiguration.html#isWaitForSegmentOnStart()"><code>IgniteConfiguration.isWaitForSegmentOnStart()</code></a>,
<a href="../../../../../org/apache/ignite/plugin/segmentation/GridSegmentationPolicy.html" title="enum in org.apache.ignite.plugin.segmentation"><code>GridSegmentationPolicy</code></a></dd></dl>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/ignite/plugin/segmentation/GridSegmentationResolver.html#isValidSegment()">isValidSegment</a></strong>()</code>
<div class="block">Checks whether segment is valid.</div>
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<h4>isValidSegment</h4>
<pre>boolean&nbsp;isValidSegment()
throws <a href="../../../../../org/apache/ignite/IgniteCheckedException.html" title="class in org.apache.ignite">IgniteCheckedException</a></pre>
<div class="block">Checks whether segment is valid.
<p>
When segmentation happens every node ends up in either one of two segments:
<ul>
<li>Correct segment</li>
<li>Invalid segment</li>
</ul>
Nodes in correct segment will continue operate as if nodes in the invalid segment
simply left the topology (i.e. the topology just got "smaller"). Nodes in the
invalid segment will realized that were "left out or disconnected" from the correct segment
and will try to reconnect via <a href="../../../../../org/apache/ignite/plugin/segmentation/GridSegmentationPolicy.html" title="enum in org.apache.ignite.plugin.segmentation"><code>segmentation policy</code></a> set
in configuration.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd><code>True</code> if segment is correct, <code>false</code> otherwise.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/ignite/IgniteCheckedException.html" title="class in org.apache.ignite">IgniteCheckedException</a></code> - If an error occurred.</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 &#169; 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>:&nbsp;&nbsp; ver. <strong>1.0.0-RC3</strong> </td> </tr> <tr style="padding: 0; margin: 0"> <td> <b>Release Date</b> </td> <td>:&nbsp;&nbsp; March 24 2015 </td> </tr> </tbody> </table> </td> </tr> </table></small></p>
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