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| <div class="left-nav__overlay"></div> |
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| <article data-swiftype-index='true'> |
| |
| <h1>Job Scheduling</h1> |
| |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>When jobs arrive at the destination node, they are submitted to a thread pool and scheduled for execution in random order. |
| However, you can change job ordering by configuring <code>CollisionSpi</code>. |
| The <code>CollisionSpi</code> interface provides a way to control how jobs are scheduled for processing on each node.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Ignite provides several implementations of the <code>CollisionSpi</code> interface:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><code>FifoQueueCollisionSpi</code> — simple FIFO ordering in multiple threads. This implementation is used by default;</p> |
| </li> |
| <li> |
| <p><code>PriorityQueueCollisionSpi</code> — priority ordering;</p> |
| </li> |
| <li> |
| <p><code>JobStealingFailoverSpi</code> — use this implementation to enable <a href="/docs/2.9.0/distributed-computing/load-balancing#job-stealing">job stealing</a>.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>To enable a specific collision spi, change the <code>IgniteConfiguration.collisionSpi</code> property.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="fifo-ordering">FIFO Ordering</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><code>FifoQueueCollisionSpi</code> provides FIFO ordering of jobs as they arrive. The jobs are executed in multiple threads. The number of threads is controlled by the <code>parallelJobsNumber</code> parameter. The default value equals 2 times the number of processor cores.</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">"collisionSpi"</span><span class="nt">></span> |
| <span class="nt"><bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.spi.collision.fifoqueue.FifoQueueCollisionSpi"</span><span class="nt">></span> |
| <span class="c"><!-- Execute one job at a time. --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"parallelJobsNumber"</span> <span class="na">value=</span><span class="s">"1"</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">FifoQueueCollisionSpi</span> <span class="n">colSpi</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">FifoQueueCollisionSpi</span><span class="o">();</span> |
| |
| <span class="c1">// Execute jobs sequentially, one at a time,</span> |
| <span class="c1">// by setting parallel job number to 1.</span> |
| <span class="n">colSpi</span><span class="o">.</span><span class="na">setParallelJobsNumber</span><span class="o">(</span><span class="mi">1</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 default collision SPI.</span> |
| <span class="n">cfg</span><span class="o">.</span><span class="na">setCollisionSpi</span><span class="o">(</span><span class="n">colSpi</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-tabs> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="priority-ordering">Priority Ordering</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Use <code>PriorityQueueCollisionSpi</code> to assign priorities to individual jobs, so that jobs with higher priority are executed ahead of lower priority jobs. You can also specify the number of threads to process jobs.</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">"collisionSpi"</span><span class="nt">></span> |
| <span class="nt"><bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.spi.collision.priorityqueue.PriorityQueueCollisionSpi"</span><span class="nt">></span> |
| <span class="c"><!-- Change the parallel job number if needed. |
| Default is number of cores times 2. --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"parallelJobsNumber"</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">PriorityQueueCollisionSpi</span> <span class="n">colSpi</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">PriorityQueueCollisionSpi</span><span class="o">();</span> |
| |
| <span class="c1">// Change the parallel job number if needed.</span> |
| <span class="c1">// Default is number of cores times 2.</span> |
| <span class="n">colSpi</span><span class="o">.</span><span class="na">setParallelJobsNumber</span><span class="o">(</span><span class="mi">5</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 default collision SPI.</span> |
| <span class="n">cfg</span><span class="o">.</span><span class="na">setCollisionSpi</span><span class="o">(</span><span class="n">colSpi</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> |
| <div class="paragraph"> |
| <p>Task priorities are set in the <a href="/docs/2.9.0/distributed-computing/map-reduce#distributed-task-session">task session</a> via the <code>grid.task.priority</code> attribute. If no priority is assigned to a task, then the default priority of 0 is used.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="java"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">MyUrgentTask</span> <span class="kd">extends</span> <span class="nc">ComputeTaskSplitAdapter</span><span class="o"><</span><span class="nc">Object</span><span class="o">,</span> <span class="nc">Object</span><span class="o">></span> <span class="o">{</span> |
| <span class="c1">// Auto-injected task session.</span> |
| <span class="nd">@TaskSessionResource</span> |
| <span class="kd">private</span> <span class="nc">ComputeTaskSession</span> <span class="n">taskSes</span> <span class="o">=</span> <span class="kc">null</span><span class="o">;</span> |
| |
| <span class="nd">@Override</span> |
| <span class="kd">protected</span> <span class="nc">Collection</span><span class="o"><</span><span class="nc">ComputeJob</span><span class="o">></span> <span class="nf">split</span><span class="o">(</span><span class="kt">int</span> <span class="n">gridSize</span><span class="o">,</span> <span class="nc">Object</span> <span class="n">arg</span><span class="o">)</span> <span class="o">{</span> |
| <span class="c1">// Set high task priority.</span> |
| <span class="n">taskSes</span><span class="o">.</span><span class="na">setAttribute</span><span class="o">(</span><span class="s">"grid.task.priority"</span><span class="o">,</span> <span class="mi">10</span><span class="o">);</span> |
| |
| <span class="nc">List</span><span class="o"><</span><span class="nc">ComputeJob</span><span class="o">></span> <span class="n">jobs</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">ArrayList</span><span class="o"><>(</span><span class="n">gridSize</span><span class="o">);</span> |
| |
| <span class="k">for</span> <span class="o">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">1</span><span class="o">;</span> <span class="n">i</span> <span class="o"><=</span> <span class="n">gridSize</span><span class="o">;</span> <span class="n">i</span><span class="o">++)</span> <span class="o">{</span> |
| <span class="n">jobs</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="k">new</span> <span class="nc">ComputeJobAdapter</span><span class="o">()</span> <span class="o">{</span> |
| |
| <span class="nd">@Override</span> |
| <span class="kd">public</span> <span class="nc">Object</span> <span class="nf">execute</span><span class="o">()</span> <span class="kd">throws</span> <span class="nc">IgniteException</span> <span class="o">{</span> |
| |
| <span class="c1">//your implementation goes here</span> |
| |
| <span class="k">return</span> <span class="kc">null</span><span class="o">;</span> |
| <span class="o">}</span> |
| <span class="o">});</span> |
| <span class="o">}</span> |
| |
| <span class="c1">// These jobs will be executed with higher priority.</span> |
| <span class="k">return</span> <span class="n">jobs</span><span class="o">;</span> |
| <span class="o">}</span> |
| |
| <span class="nd">@Override</span> |
| <span class="kd">public</span> <span class="nc">Object</span> <span class="nf">reduce</span><span class="o">(</span><span class="nc">List</span><span class="o"><</span><span class="nc">ComputeJobResult</span><span class="o">></span> <span class="n">results</span><span class="o">)</span> <span class="kd">throws</span> <span class="nc">IgniteException</span> <span class="o">{</span> |
| <span class="k">return</span> <span class="kc">null</span><span class="o">;</span> |
| <span class="o">}</span> |
| <span class="o">}</span></code></pre> |
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