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    <title>MongoDB Jira</title>
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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-3385] Publish/Subscribe (Message queue) functionality</title>
                <link>https://jira.mongodb.org/browse/SERVER-3385</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Message queue functionality is something that is/was traditionally handled by a dedicated message broker, i.e. RabbitMQ when using AMQP as protocol.&lt;/p&gt;

&lt;p&gt;A growing trend is to use solutions that are easier to setup and maintain, such as pub/sub solutions (quite many of them). There are also NoSQL databases that have added such extensions, and the most common example is Redis.&lt;/p&gt;

&lt;p&gt;MongoDB could fit very well in this world. (Capped) collections with polling subscribers can already today be used to simulate a message queue, but this is just a workaround. Having native support for publish/subscribe in MongoDB (with blocking readers, for example) can be used to add message queues without having to setup and maintain separate solutions and keep the same concepts as the application developers have grown used to, like the rich expressiveness of documents as messages. The advantages of replica sets can be used to add reliability and durability of messages in a queue (well, this would rule out capped collections).&lt;/p&gt;

&lt;p&gt;An API would have to be created, and the concepts would have to be defined.&lt;/p&gt;</description>
                <environment></environment>
        <key id="19212">SERVER-3385</key>
            <summary>Publish/Subscribe (Message queue) functionality</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="vboivie">Victor Boivie</reporter>
                        <labels>
                            <label>message.queue</label>
                            <label>pub.sub</label>
                            <label>publish.subscribe</label>
                    </labels>
                <created>Thu, 7 Jul 2011 06:00:05 +0000</created>
                <updated>Tue, 6 Dec 2022 05:42:24 +0000</updated>
                            <resolved>Fri, 3 Dec 2021 13:05:23 +0000</resolved>
                                                    <fixVersion>features we&amp;#39;re not sure of</fixVersion>
                    <fixVersion>3.6.0</fixVersion>
                                    <component>Usability</component>
                                        <votes>28</votes>
                                    <watches>27</watches>
                                                                                                                <comments>
                            <comment id="4229279" author="tommaso.tocci" created="Fri, 3 Dec 2021 13:05:23 +0000"  >&lt;p&gt;ChangeStreams have been added since 3.6 as part of PM-89.&lt;/p&gt;</comment>
                            <comment id="109077" author="yookoala" created="Thu, 12 Apr 2012 12:34:15 +0000"  >&lt;p&gt;This will be a really awesome feature! I don&apos;t really want to run both Redis and MongoDB in my stack but I need Redis&apos;s Pubsub to scale my service. I hope MongoDB will have pubsub soon.&lt;/p&gt;</comment>
                            <comment id="107195" author="ejsmont.artur" created="Fri, 6 Apr 2012 01:15:55 +0000"  >&lt;p&gt;+1 YES yes and one more time yes. This would be an awesome tandem and plus for MongoDB if it could replace simple 1-1 / 1-n persistent queues.&lt;/p&gt;</comment>
                            <comment id="84022" author="wtpayne" created="Wed, 1 Feb 2012 13:27:20 +0000"  >&lt;p&gt;+1; I am currently using tailing &amp;amp; capped collections. Pub/sub would help me to improve the testability of my logic.&lt;/p&gt;</comment>
                            <comment id="79954" author="vingrad" created="Sun, 15 Jan 2012 15:36:13 +0000"  >&lt;p&gt;+1&lt;/p&gt;</comment>
                            <comment id="54699" author="digitalronin" created="Fri, 16 Sep 2011 11:07:26 +0000"  >&lt;p&gt;+1 this would be really helpful for me. I&apos;m planning to use multiple (around 300) MongoDB instances partially as a distributed smart cache. pub/sub support would make it much easier to keep all the nodes in sync.&lt;/p&gt;</comment>
                            <comment id="48987" author="hmexx007" created="Wed, 17 Aug 2011 12:15:00 +0000"  >&lt;p&gt;+1 as well&lt;/p&gt;

&lt;p&gt;Submitted the same request before seeing this.&lt;/p&gt;</comment>
                            <comment id="42674" author="fbjork" created="Sun, 17 Jul 2011 01:23:03 +0000"  >&lt;p&gt;+1 for Pub/Sub support in MongoDB!&lt;/p&gt;</comment>
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