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| <article data-swiftype-index='true'> |
| |
| <h1>Fault Tolerance</h1> |
| |
| <div class="paragraph"> |
| <p>Ignite supports automatic job failover. |
| In case of a node crash, jobs are automatically transferred to other available nodes for re-execution. |
| As long as there is at least one node standing, no job is ever lost.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The global failover strategy is controlled by the <code>IgniteConfiguration.failoverSpi</code> property.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Available implementations:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><code>AlwaysFailoverSpi</code> — This implementation always reroutes a failed job to another node, and is used by default.</p> |
| <div class="paragraph"> |
| <p>When a job from a compute task fails, an attempt is made to reroute the failed job to a node that has not executed any other job from the same task. If no such node is available, then an attempt is made to reroute the failed job to one of the nodes that may be running other jobs from the same task. If none of the above attempts succeeds, then the job is not failed over.</p> |
| </div> |
| <code-tabs><code-tab data-tab='XML'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="xml"><span class="nt"><bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.IgniteConfiguration"</span><span class="nt">></span> |
| |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"failoverSpi"</span><span class="nt">></span> |
| <span class="nt"><bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.spi.failover.always.AlwaysFailoverSpi"</span><span class="nt">></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"maximumFailoverAttempts"</span> <span class="na">value=</span><span class="s">"5"</span><span class="nt">/></span> |
| <span class="nt"></bean></span> |
| <span class="nt"></property></span> |
| |
| <span class="nt"></bean></span></code></pre> |
| </div> |
| </div></code-tab><code-tab data-tab='Java'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="java"><span class="nc">AlwaysFailoverSpi</span> <span class="n">failSpi</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">AlwaysFailoverSpi</span><span class="o">();</span> |
| |
| <span class="c1">// Override maximum failover attempts.</span> |
| <span class="n">failSpi</span><span class="o">.</span><span class="na">setMaximumFailoverAttempts</span><span class="o">(</span><span class="mi">5</span><span class="o">);</span> |
| |
| <span class="c1">// Override the default failover SPI.</span> |
| <span class="nc">IgniteConfiguration</span> <span class="n">cfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">IgniteConfiguration</span><span class="o">().</span><span class="na">setFailoverSpi</span><span class="o">(</span><span class="n">failSpi</span><span class="o">);</span> |
| |
| <span class="c1">// Start a node.</span> |
| <span class="nc">Ignite</span> <span class="n">ignite</span> <span class="o">=</span> <span class="nc">Ignition</span><span class="o">.</span><span class="na">start</span><span class="o">(</span><span class="n">cfg</span><span class="o">);</span></code></pre> |
| </div> |
| </div></code-tab><code-tab data-tab='C#/.NET' data-unavailable='true'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code>This API is not presently available for C#/.NET. You can use XML configuration.</code></pre> |
| </div> |
| </div></code-tab><code-tab data-tab='C++' data-unavailable='true'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code>This API is not presently available for C++. You can use XML configuration.</code></pre> |
| </div> |
| </div></code-tab></code-tabs> |
| </li> |
| <li> |
| <p><code>NeverFailoverSpi</code> — This implementation never fails over failed jobs.</p> |
| <code-tabs><code-tab data-tab='XML'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="xml"><span class="nt"><bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.IgniteConfiguration"</span><span class="nt">></span> |
| |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"failoverSpi"</span><span class="nt">></span> |
| <span class="nt"><bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.spi.failover.never.NeverFailoverSpi"</span><span class="nt">/></span> |
| <span class="nt"></property></span> |
| |
| <span class="nt"></bean></span></code></pre> |
| </div> |
| </div></code-tab><code-tab data-tab='Java'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="java"><span class="nc">NeverFailoverSpi</span> <span class="n">failSpi</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">NeverFailoverSpi</span><span class="o">();</span> |
| |
| <span class="nc">IgniteConfiguration</span> <span class="n">cfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">IgniteConfiguration</span><span class="o">();</span> |
| |
| <span class="c1">// Override the default failover SPI.</span> |
| <span class="n">cfg</span><span class="o">.</span><span class="na">setFailoverSpi</span><span class="o">(</span><span class="n">failSpi</span><span class="o">);</span> |
| |
| <span class="c1">// Start a node.</span> |
| <span class="nc">Ignite</span> <span class="n">ignite</span> <span class="o">=</span> <span class="nc">Ignition</span><span class="o">.</span><span class="na">start</span><span class="o">(</span><span class="n">cfg</span><span class="o">);</span></code></pre> |
| </div> |
| </div></code-tab><code-tab data-tab='C#/.NET' data-unavailable='true'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code>This API is not presently available for C#/.NET. You can use XML configuration.</code></pre> |
| </div> |
| </div></code-tab><code-tab data-tab='C++' data-unavailable='true'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code>This API is not presently available for C++. You can use XML configuration.</code></pre> |
| </div> |
| </div></code-tab></code-tabs> |
| </li> |
| <li> |
| <p><code>JobStealingFailoverSpi</code> — This implementation must be used only if you want to enable <a href="/docs/2.9.0/distributed-computing/load-balancing#job-stealing">job stealing</a>.</p> |
| </li> |
| </ul> |
| </div> |
| </article> |
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| // matching your search input |
| inputSelector: '#search-input', |
| // Set debug to true to inspect the dropdown |
| debug: true, |
| }); |
| </script> |
| <script type='module' src='/assets/js/index.js?1598500266' async crossorigin></script> |
| <script type='module' src='/assets/js/versioning.js?1598500266' async crossorigin></script> |
| </body> |
| |
| </html> |
