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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-34357] produce (or allow to be produced programmatically) a list of top-level aggregation operators for easier declarative testing in sharding</title>
                <link>https://jira.mongodb.org/browse/SERVER-34357</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Sharding has several features that operate on all commands (or large swaths of commands):&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;safe secondary reads&lt;/li&gt;
	&lt;li&gt;shard and database versioning&lt;/li&gt;
	&lt;li&gt;causal consistency&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;For several of these, we have declarative tests that define a test case for every &lt;b&gt;command&lt;/b&gt; (from listCommands output) and check that the feature works correctly for that command.&lt;/p&gt;

&lt;p&gt;As query moves towards pushing more operations into aggregation, we lose coverage in these tests, since they do not define test cases for every possible initial &lt;b&gt;aggregation stage&lt;/b&gt;.&lt;/p&gt;

&lt;p&gt;This is especially problematic because these aggregation stages often have special logic ($changeStreams, $listCollections, $currentOp come to mind), so just testing a simple &quot;aggregate&quot; is not enough.&lt;/p&gt;</description>
                <environment></environment>
        <key id="523083">SERVER-34357</key>
            <summary>produce (or allow to be produced programmatically) a list of top-level aggregation operators for easier declarative testing in sharding</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Fri, 6 Apr 2018 14:08:34 +0000</created>
                <updated>Tue, 6 Dec 2022 03:32:46 +0000</updated>
                            <resolved>Mon, 23 Mar 2020 20:01:48 +0000</resolved>
                                    <version>3.7.3</version>
                                                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="2992872" author="david.storch" created="Mon, 23 Mar 2020 20:00:46 +0000"  >&lt;p&gt;Thanks for taking a look &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=esha.maharishi&quot; class=&quot;user-hover&quot; rel=&quot;esha.maharishi&quot;&gt;esha.maharishi&lt;/a&gt;! I&apos;m going to change the resolution of this ticket to &quot;Won&apos;t Do&quot;. Let us know if you run into any trouble using the new &lt;tt&gt;aggStageCounters&lt;/tt&gt;.&lt;/p&gt;</comment>
                            <comment id="2983718" author="esha.maharishi@10gen.com" created="Tue, 17 Mar 2020 18:23:22 +0000"  >&lt;p&gt;Hm, I didn&apos;t know about that - yes, that seems like it would work! I filed &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46920&quot; title=&quot;Add test cases for all agg stages to shard versioning and database versioning sharding tests&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46920&quot;&gt;&lt;del&gt;SERVER-46920&lt;/del&gt;&lt;/a&gt; to add the test coverage and am closing this ticket as Works as Designed.&lt;/p&gt;</comment>
                            <comment id="1857744" author="esha.maharishi@10gen.com" created="Fri, 6 Apr 2018 15:53:00 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kyle.suarez&quot; class=&quot;user-hover&quot; rel=&quot;kyle.suarez&quot;&gt;kyle.suarez&lt;/a&gt;, ok. Do you (and the rest of the team) think someone could at least produce a written one-time list as of 4.0, so that we can improve our testing for 4.0?&lt;/p&gt;

&lt;p&gt;CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.storch&quot; class=&quot;user-hover&quot; rel=&quot;david.storch&quot;&gt;david.storch&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1857661" author="kyle.suarez" created="Fri, 6 Apr 2018 15:07:55 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=esha.maharishi&quot; class=&quot;user-hover&quot; rel=&quot;esha.maharishi&quot;&gt;esha.maharishi&lt;/a&gt; &amp;#8211; sorry for closing without a comment. I understand that it&apos;s a pain point for the Sharding Team during testing, but the Query Team doesn&apos;t have any engineering power to do this in the near future. Unless it&apos;s directly blocking some critical sharding feature we&apos;re not going to schedule it.&lt;/p&gt;

&lt;p&gt;If the Sharding Team really wanted this, I suppose you guys could pick it up if you consulted the Query Team regarding the design of how it would be implemented.&lt;/p&gt;</comment>
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