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This procedure is designed to take place at broker.</p> + +<p><code class="highlighter-rouge">ConsumerManager</code> manage the suscriptions of push consumer, and <code class="highlighter-rouge">ConsumerFilterManager</code> manage the expression info of push consumer who wish to filter message by special language, the info includes data version, expression, compiled expression, alive time and etc.</p> + +<ul> + <li>How to filter message by expression</li> +</ul> + +<p>I redesign the interface <code class="highlighter-rouge">getMessage</code> of <code class="highlighter-rouge">MessageStore</code> by replace the last parameter <code class="highlighter-rouge">SubscriptionData</code> to <code class="highlighter-rouge">MessageFilter</code> that is also refactored. The purpose is to make module <code class="highlighter-rouge">rocketmq-store</code> has no relation with protocol.</p> + +<p>When get message, the implementation <code class="highlighter-rouge">ExpressionMessageFilter</code> would check whether the message is matched by <code class="highlighter-rouge">BitsArray</code> which will be refered later or evaluation, just as the mechanism of tag filtering.</p> + +<ul> + <li>Optimization, pre-calculate the filtering result when build consume queue</li> +</ul> + +<p>Itâs poor performance to do filter when pull message:</p> + +<ol> + <li>off-heap to heap, once every consumer subscribed same topic pull message.</li> + <li>decode message properties, once every consumer subscribed same topic pull message.</li> +</ol> + +<p><code class="highlighter-rouge">BloomFilter</code> and pre-calculation are adopted to optimize the situation:</p> + +<p><img src="/assets/images/blog/filter_build_cq_apache.png" alt="screenshot" /></p> + +<ol> + <li>Every consumer has been asigned some bit position of <code class="highlighter-rouge">BloomFilter</code> when register to broker.</li> + <li>When broker build queue after message into <code class="highlighter-rouge">CommitLog</code>, the consumerâs filtering result would be calculated, and all resuls are assembled as a <code class="highlighter-rouge">BitsArray</code> saved in <code class="highlighter-rouge">ConsumeQueueExt</code>.</li> + <li><code class="highlighter-rouge">ConsumeQueueExt</code> is a store file linked to <code class="highlighter-rouge">ConsumeQueue</code>, <code class="highlighter-rouge">ConsumeQueue</code> could find the data by the <code class="highlighter-rouge">tagsCode</code> whitch is already replaced by the address(for compitable, the range is Long.MIN_VALUE to Integer.MIN_VALUE) generated by <code class="highlighter-rouge">ConsumeQueueExt</code>.</li> + <li><code class="highlighter-rouge">ExpressionMessageFilter</code> could use the <code class="highlighter-rouge">BitsArray</code> to check whether the message is matched. Because of BloomFilterâs collision, it also need to decode properties to do calculation for matched message(may could be reduced by check the collision, not include in this edition).</li> +</ol> + +<p>This optimization is suitable for:</p> + +<ol> + <li>High subscription ratio.</li> + <li>Large properties.</li> +</ol> + +<p>This optimization is off default, it need set some configs when broker starting to switch on:</p> + +<ol> + <li>enableCalcFilterBitMap = true, means to caculate bitmap when build consume queue.</li> + <li>expectConsumerNumUseFilter = XX(Integer, default is 32), means estimated consumer num subscribe same topic.</li> + <li>maxErrorRateOfBloomFilter = XX(1~100, default is 20), means error rate of bloom filter.</li> + <li>enableConsumeQueueExt = true, means construct consume queue extend file.</li> +</ol> + +<h3 id="interface">Interface</h3> + +<p>Only push consumer could filter message by SQL92 expression in this edition, the interface is:</p> + +<p><code class="highlighter-rouge">public void subscribe(final String topic, final MessageSelector messageSelector)</code></p> + +<h3 id="performance-comparison">Performance Comparison</h3> + +<p>Configuration of broker machine: 32 core, 128G memory, 1000Mb/s full duplex dual network</p> + +<p>Producer send message with 1k body and 1k properties.</p> + +<p>Five consumers consume message through push model, every consumer would get 1/5 messages of total.</p> + +<p>Cpu and gc frequency is about 30% lower when do pre-calculate filtering result.</p> + + + </section> + + <footer class="page__meta"> + + + + + + + + + + <p class="page__taxonomy"> + <strong><i class="fa fa-fw fa-tags" aria-hidden="true"></i> Tags: </strong> + <span itemprop="keywords"> + + + + <a href="/tags/#filter" class="page__taxonomy-item" rel="tag">Filter</a><span class="sep">, </span> + + + + <a href="/tags/#rocketmq" class="page__taxonomy-item" rel="tag">RocketMQ</a> + + </span> + </p> + + + + + + + + + + + + <p class="page__taxonomy"> + <strong><i class="fa fa-fw fa-folder-open" aria-hidden="true"></i> Categories: </strong> + <span itemprop="keywords"> + + + + <a href="/categories/#rocketmq" class="page__taxonomy-item" rel="tag">RocketMQ</a> + + </span> + </p> + + + + <p class="page__date"><strong><i class="fa fa-fw fa-calendar" aria-hidden="true"></i> Updated:</strong> <time datetime="2017-04-26T00:00:00+08:00">April 26, 2017</time></p> + + </footer> + + <section class="page__share"> + + <h4 class="page__share-title">Share on</h4> + + + <a href="https://twitter.com/intent/tweet?via=ApacheRocketMQ&text=Filter Messages By SQL92 In RocketMQ /rocketmq/filter-messages-by-sql92-in-rocketmq/" class="btn btn--twitter" title="Share on Twitter"><i class="fa fa-fw fa-twitter" aria-hidden="true"></i><span> Twitter</span></a> + + <a href="https://www.facebook.com/sharer/sharer.php?u=/rocketmq/filter-messages-by-sql92-in-rocketmq/"; 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RocketMQ only support message filtering feature by TAG, but one message only can own one tag, this is too limited to meet complex business requiremen...</p> + </article> +</div> + + + <h2 id="java" class="archive__subtitle">Java</h2> @@ -1074,6 +1128,32 @@ and fulfill much of this responsibility through managing...</p> <h2 class="archive__item-title" itemprop="headline"> + <a href="/rocketmq/filter-messages-by-sql92-in-rocketmq/" rel="permalink">Filter Messages By SQL92 In RocketMQ +</a> + + </h2> + + <p class="page__meta"><i class="fa fa-clock-o" aria-hidden="true"></i> + + + + + 3 minute read +</p> + + <p class="archive__item-excerpt" itemprop="description">So far, RocketMQ only support message filtering feature by TAG, but one message only can own one tag, this is too limited to meet complex business requiremen...</p> + </article> +</div> + + + + + +<div class="list__item"> + <article class="archive__item" itemscope itemtype="http://schema.org/CreativeWork";> + + <h2 class="archive__item-title" itemprop="headline"> + <a href="/rocketmq/four-methods-to-feed-name-server-address-list/" rel="permalink">Four Methods to Feed Name Server Address List </a> http://git-wip-us.apache.org/repos/asf/incubator-rocketmq-site/blob/3ee8692b/content/year-archive/index.html ---------------------------------------------------------------------- diff --git a/content/year-archive/index.html b/content/year-archive/index.html index d4c8d92..43bd791 100644 --- a/content/year-archive/index.html +++ b/content/year-archive/index.html @@ -300,6 +300,34 @@ <h2 class="archive__item-title" itemprop="headline"> + <a href="/rocketmq/filter-messages-by-sql92-in-rocketmq/" rel="permalink">Filter Messages By SQL92 In RocketMQ +</a> + + </h2> + + <p class="page__meta"><i class="fa fa-clock-o" aria-hidden="true"></i> + + + + + 3 minute read +</p> + + <p class="archive__item-excerpt" itemprop="description">So far, RocketMQ only support message filtering feature by TAG, but one message only can own one tag, this is too limited to meet complex business requiremen...</p> + </article> +</div> + + + + + + + +<div class="list__item"> + <article class="archive__item" itemscope itemtype="http://schema.org/CreativeWork";> + + <h2 class="archive__item-title" itemprop="headline"> + <a href="/activity/launch-rocketmq-code-marathon/" rel="permalink">Launch The Second RocketMQ Code Marathon </a>
