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| <div class="left-nav__overlay"></div> |
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| <article data-swiftype-index='true'> |
| <a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/distributed-computing/load-balancing.adoc" target="_blank">Edit</a> |
| |
| <h1>Load Balancing</h1> |
| |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Ignite automatically load balances jobs produced by a <a href="/docs/2.9.0/distributed-computing/map-reduce">compute task</a> as well as individual tasks submitted via the distributed computing API. Individual tasks submitted via <code>IgniteCompute.run(…​)</code> and other compute methods are treated as tasks producing a single job.</p> |
| </div> |
| <div class="paragraph"> |
| <p>By default, Ignite uses a round-robin algorithm (<code>RoundRobinLoadBalancingSpi</code>), which distributes jobs in sequential order across the nodes specified for the compute task.</p> |
| </div> |
| <div class="admonitionblock note"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <div class="title">Note</div> |
| </td> |
| <td class="content"> |
| <div class="paragraph"> |
| <p>Load balancing does not apply to <a href="/docs/2.9.0/collocated-computations">colocated computations</a>.</p> |
| </div> |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>The load balancing algorithm is controlled by the <code>IgniteConfiguration.loadBalancingSpi</code> property.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="round-robin-load-balancing">Round-Robin Load Balancing</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><code>RoundRobinLoadBalancingSpi</code> iterates through the available nodes in a round-robin fashion and picks the next sequential node. The available nodes are defined when you <a href="/docs/2.9.0/distributed-computing/distributed-computing#getting-the-compute-interface">get the compute instance</a> through which you execute your tasks.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Round-Robin load balancing supports two modes of operation: per-task and global.</p> |
| </div> |
| <div class="paragraph"> |
| <p>When configured in per-task mode, the implementation picks a random node at the beginning of every task execution and then sequentially iterates through all the nodes in the topology starting from that node. For cases when the split size of a task is equal to the number of nodes, this mode guarantees that all nodes will participate in job execution.</p> |
| </div> |
| <div class="admonitionblock important"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <div class="title">Important</div> |
| </td> |
| <td class="content"> |
| <div class="paragraph"> |
| <p>The per-task mode requires that the following event types be enabled: <code>EVT_TASK_FAILED</code>, <code>EVT_TASK_FINISHED</code>, <code>EVT_JOB_MAPPED</code>.</p> |
| </div> |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>When configured in global mode, a single sequential queue of nodes is maintained for all tasks and the next node in the queue is picked every time. In this mode (unlike in per-task mode), it is possible that even if the split size of a task is equal to the number of nodes, some jobs within the same task will be assigned to the same node whenever multiple tasks are executing concurrently.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The global mode is used by default.</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="cp"><?xml version="1.0" encoding="UTF-8"?></span> |
| <span class="nt"><beans</span> <span class="na">xmlns=</span><span class="s">"http://www.springframework.org/schema/beans"</span> |
| <span class="na">xmlns:util=</span><span class="s">"http://www.springframework.org/schema/util"</span> |
| <span class="na">xmlns:xsi=</span><span class="s">"http://www.w3.org/2001/XMLSchema-instance"</span> |
| <span class="na">xsi:schemaLocation=</span><span class="s">" http://www.springframework.org/schema/beans |
| http://www.springframework.org/schema/beans/spring-beans.xsd |
| http://www.springframework.org/schema/util |
| http://www.springframework.org/schema/util/spring-util.xsd"</span><span class="nt">></span> |
| <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">"includeEventTypes"</span><span class="nt">></span> |
| <span class="nt"><list></span> |
| <span class="c"><!--these events are required for the per-task mode--></span> |
| <span class="nt"><util:constant</span> <span class="na">static-field=</span><span class="s">"org.apache.ignite.events.EventType.EVT_TASK_FINISHED"</span><span class="nt">/></span> |
| <span class="nt"><util:constant</span> <span class="na">static-field=</span><span class="s">"org.apache.ignite.events.EventType.EVT_TASK_FAILED"</span><span class="nt">/></span> |
| <span class="nt"><util:constant</span> <span class="na">static-field=</span><span class="s">"org.apache.ignite.events.EventType.EVT_JOB_MAPPED"</span><span class="nt">/></span> |
| <span class="nt"></list></span> |
| <span class="nt"></property></span> |
| |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"loadBalancingSpi"</span><span class="nt">></span> |
| <span class="nt"><bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.spi.loadbalancing.roundrobin.RoundRobinLoadBalancingSpi"</span><span class="nt">></span> |
| <span class="c"><!-- Activate the per-task round-robin mode. --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"perTask"</span> <span class="na">value=</span><span class="s">"true"</span><span class="nt">/></span> |
| <span class="nt"></bean></span> |
| <span class="nt"></property></span> |
| |
| <span class="nt"></bean></span> |
| <span class="nt"></beans></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">RoundRobinLoadBalancingSpi</span> <span class="n">spi</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">RoundRobinLoadBalancingSpi</span><span class="o">();</span> |
| <span class="n">spi</span><span class="o">.</span><span class="na">setPerTask</span><span class="o">(</span><span class="kc">true</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">// these events are required for the per-task mode</span> |
| <span class="n">cfg</span><span class="o">.</span><span class="na">setIncludeEventTypes</span><span class="o">(</span><span class="nc">EventType</span><span class="o">.</span><span class="na">EVT_TASK_FINISHED</span><span class="o">,</span> <span class="nc">EventType</span><span class="o">.</span><span class="na">EVT_TASK_FAILED</span><span class="o">,</span> <span class="nc">EventType</span><span class="o">.</span><span class="na">EVT_JOB_MAPPED</span><span class="o">);</span> |
| |
| <span class="c1">// Override default load balancing SPI.</span> |
| <span class="n">cfg</span><span class="o">.</span><span class="na">setLoadBalancingSpi</span><span class="o">(</span><span class="n">spi</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> |
| </div> |
| <div class="sect1"> |
| <h2 id="random-and-weighted-load-balancing">Random and Weighted Load Balancing</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><code>WeightedRandomLoadBalancingSpi</code> picks a random node from the list of available nodes. You can also optionally assign weights to nodes, so that nodes with larger weights will end up getting proportionally more jobs routed to them. By default all nodes get a weight of 10.</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">"loadBalancingSpi"</span><span class="nt">></span> |
| <span class="nt"><bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.spi.loadbalancing.weightedrandom.WeightedRandomLoadBalancingSpi"</span><span class="nt">></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"useWeights"</span> <span class="na">value=</span><span class="s">"true"</span><span class="nt">/></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"nodeWeight"</span> <span class="na">value=</span><span class="s">"10"</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">WeightedRandomLoadBalancingSpi</span> <span class="n">spi</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">WeightedRandomLoadBalancingSpi</span><span class="o">();</span> |
| |
| <span class="c1">// Configure SPI to use the weighted random load balancing algorithm.</span> |
| <span class="n">spi</span><span class="o">.</span><span class="na">setUseWeights</span><span class="o">(</span><span class="kc">true</span><span class="o">);</span> |
| |
| <span class="c1">// Set weight for the local node.</span> |
| <span class="n">spi</span><span class="o">.</span><span class="na">setNodeWeight</span><span class="o">(</span><span class="mi">10</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 load balancing SPI.</span> |
| <span class="n">cfg</span><span class="o">.</span><span class="na">setLoadBalancingSpi</span><span class="o">(</span><span class="n">spi</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> |
| </div> |
| <div class="sect1"> |
| <h2 id="job-stealing">Job Stealing</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Quite often clusters are deployed across many computers some of which may be more powerful or under-utilized than others. Enabling <code>JobStealingCollisionSpi</code> helps avoid jobs being stuck at an over-utilized node, as they will be stolen by an under-utilized node.</p> |
| </div> |
| <div class="paragraph"> |
| <p><code>JobStealingCollisionSpi</code> supports job stealing from over-utilized nodes to under-utilized nodes. This SPI is especially useful if you have some jobs that complete quickly, while others are sitting in the waiting queue on over-utilized nodes. In such a case, the waiting jobs will be stolen from the slower node and moved to the fast/under-utilized node.</p> |
| </div> |
| <div class="paragraph"> |
| <p><code>JobStealingCollisionSpi</code> adopts a "late" load balancing technique, which allows reassigning a job from node A to node B after the job has been scheduled for execution on node A.</p> |
| </div> |
| <div class="admonitionblock important"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <div class="title">Important</div> |
| </td> |
| <td class="content"> |
| <div class="paragraph"> |
| <p>If you want to enable job stealing, you have to configure <code>JobStealingFailoverSpi</code> as the failover SPI. See <a href="/docs/2.9.0/distributed-computing/fault-tolerance">Fault Tolerance</a> for details.</p> |
| </div> |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>Here is an example of how to configure <code>JobStealingCollisionSpi</code>:</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="c"><!-- Enabling the required Failover SPI. --></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.jobstealing.JobStealingFailoverSpi"</span><span class="nt">/></span> |
| <span class="nt"></property></span> |
| <span class="c"><!-- Enabling the JobStealingCollisionSpi for late load balancing. --></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.jobstealing.JobStealingCollisionSpi"</span><span class="nt">></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"activeJobsThreshold"</span> <span class="na">value=</span><span class="s">"50"</span><span class="nt">/></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"waitJobsThreshold"</span> <span class="na">value=</span><span class="s">"0"</span><span class="nt">/></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"messageExpireTime"</span> <span class="na">value=</span><span class="s">"1000"</span><span class="nt">/></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"maximumStealingAttempts"</span> <span class="na">value=</span><span class="s">"10"</span><span class="nt">/></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"stealingEnabled"</span> <span class="na">value=</span><span class="s">"true"</span><span class="nt">/></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"stealingAttributes"</span><span class="nt">></span> |
| <span class="nt"><map></span> |
| <span class="nt"><entry</span> <span class="na">key=</span><span class="s">"node.segment"</span> <span class="na">value=</span><span class="s">"foobar"</span><span class="nt">/></span> |
| <span class="nt"></map></span> |
| <span class="nt"></property></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">JobStealingCollisionSpi</span> <span class="n">spi</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">JobStealingCollisionSpi</span><span class="o">();</span> |
| |
| <span class="c1">// Configure number of waiting jobs</span> |
| <span class="c1">// in the queue for job stealing.</span> |
| <span class="n">spi</span><span class="o">.</span><span class="na">setWaitJobsThreshold</span><span class="o">(</span><span class="mi">10</span><span class="o">);</span> |
| |
| <span class="c1">// Configure message expire time (in milliseconds).</span> |
| <span class="n">spi</span><span class="o">.</span><span class="na">setMessageExpireTime</span><span class="o">(</span><span class="mi">1000</span><span class="o">);</span> |
| |
| <span class="c1">// Configure stealing attempts number.</span> |
| <span class="n">spi</span><span class="o">.</span><span class="na">setMaximumStealingAttempts</span><span class="o">(</span><span class="mi">10</span><span class="o">);</span> |
| |
| <span class="c1">// Configure number of active jobs that are allowed to execute</span> |
| <span class="c1">// in parallel. This number should usually be equal to the number</span> |
| <span class="c1">// of threads in the pool (default is 100).</span> |
| <span class="n">spi</span><span class="o">.</span><span class="na">setActiveJobsThreshold</span><span class="o">(</span><span class="mi">50</span><span class="o">);</span> |
| |
| <span class="c1">// Enable stealing.</span> |
| <span class="n">spi</span><span class="o">.</span><span class="na">setStealingEnabled</span><span class="o">(</span><span class="kc">true</span><span class="o">);</span> |
| |
| <span class="c1">// Set stealing attribute to steal from/to nodes that have it.</span> |
| <span class="n">spi</span><span class="o">.</span><span class="na">setStealingAttributes</span><span class="o">(</span><span class="nc">Collections</span><span class="o">.</span><span class="na">singletonMap</span><span class="o">(</span><span class="s">"node.segment"</span><span class="o">,</span> <span class="s">"foobar"</span><span class="o">));</span> |
| |
| <span class="c1">// Enable `JobStealingFailoverSpi`</span> |
| <span class="nc">JobStealingFailoverSpi</span> <span class="n">failoverSpi</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">JobStealingFailoverSpi</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">spi</span><span class="o">);</span> |
| |
| <span class="n">cfg</span><span class="o">.</span><span class="na">setFailoverSpi</span><span class="o">(</span><span class="n">failoverSpi</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> |
| </div> |
| </article> |
| <nav class="right-nav" data-swiftype-index='false'> |
| <ul class="sectlevel1"> |
| <li><a href="#round-robin-load-balancing">Round-Robin Load Balancing</a></li> |
| <li><a href="#random-and-weighted-load-balancing">Random and Weighted Load Balancing</a></li> |
| <li><a href="#job-stealing">Job Stealing</a></li> |
| </ul> |
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