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    <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>[DRIVERS-1958] aggregate-write-readPreference tests should not expect readConcern to be passed to pre-4.2 servers</title>
                <link>https://jira.mongodb.org/browse/DRIVERS-1958</link>
                <project id="10980" key="DRIVERS">Drivers</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #fafbfc;border-color: #21313c;border-style: solid;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #fafbfc;&quot;&gt;
&lt;h3&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;&lt;b&gt;Summary&lt;/b&gt;&lt;/h3&gt;

&lt;p&gt;The original spec tests for &lt;a href=&quot;https://jira.mongodb.org/browse/DRIVERS-823&quot; title=&quot;Support $merge and $out executing on secondaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DRIVERS-823&quot;&gt;DRIVERS-823&lt;/a&gt; ($out/$merge on secondaries) included assertions that a client-level &lt;tt&gt;readConcern&lt;/tt&gt; option would be passed to pre-5.0 servers. Read concerns for write stages were not generally supported before MongoDB 4.2 (&lt;a href=&quot;https://jira.mongodb.org/browse/DRIVERS-610&quot; title=&quot;Add support for majority read concern level to Aggregation $out&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DRIVERS-610&quot;&gt;&lt;del&gt;DRIVERS-610&lt;/del&gt;&lt;/a&gt;), so those tests should specify a lower version requirement to avoid potential failures.&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;Motivation&quot;&gt;&lt;/a&gt;&lt;b&gt;Motivation&lt;/b&gt;&lt;/h3&gt;
&lt;h4&gt;&lt;a name=&quot;Whoistheaffectedenduser%3F&quot;&gt;&lt;/a&gt;Who is the affected end user?&lt;/h4&gt;
&lt;p&gt;Driver test suites.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Howdoesthisaffecttheenduser%3F&quot;&gt;&lt;/a&gt;How does this affect the end user?&lt;/h4&gt;
&lt;p&gt;Failing tests for pre-4.2 server versions.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Howlikelyisitthatthisproblemorusecasewilloccur%3F&quot;&gt;&lt;/a&gt;How likely is it that this problem or use case will occur?&lt;/h4&gt;
&lt;p&gt;Always, unless a driver is sending &lt;tt&gt;readConcern&lt;/tt&gt; to pre-4.2 servers and no server-side error is raised. The tests happen to use read concern level &quot;local&quot;, so it&apos;s possible that it would be silently ignored (I&apos;ve not verified that).&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Iftheproblemdoesoccur%2Cwhataretheconsequencesandhowseverearethey%3F&quot;&gt;&lt;/a&gt;If the problem does occur, what are the consequences and how severe are they?&lt;/h4&gt;
&lt;p&gt;Minor annoyance with a failing test; however, this should not affect users.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Isthisissueurgent%3F&quot;&gt;&lt;/a&gt;Is this issue urgent?&lt;/h4&gt;
&lt;p&gt;Drivers may consider this urgent to resolve failing CI.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Isthisticketrequiredbyadownstreamteam%3F&quot;&gt;&lt;/a&gt;Is this ticket required by a downstream team?&lt;/h4&gt;
&lt;p&gt;No.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Isthisticketonlyfortests%3F&quot;&gt;&lt;/a&gt;Is this ticket only for tests?&lt;/h4&gt;
&lt;p&gt;Yes.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;</description>
                <environment></environment>
        <key id="1903378">DRIVERS-1958</key>
            <summary>aggregate-write-readPreference tests should not expect readConcern to be passed to pre-4.2 servers</summary>
                <type id="14901" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14700&amp;avatarType=issuetype">Spec Change</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="13453" iconUrl="https://jira.mongodb.org/images/icons/status_generic.gif" description="">Implementing</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="jmikola@mongodb.com">Jeremy Mikola</assignee>
                                    <reporter username="jmikola@mongodb.com">Jeremy Mikola</reporter>
                        <labels>
                            <label>yaml-test</label>
                    </labels>
                <created>Wed, 20 Oct 2021 14:34:04 +0000</created>
                <updated>Fri, 20 May 2022 23:39:10 +0000</updated>
                                                                <component>CRUD</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4136006" author="xgen-internal-githook" created="Wed, 20 Oct 2021 17:45:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jeremy Mikola&apos;, &apos;email&apos;: &apos;jmikola@gmail.com&apos;, &apos;username&apos;: &apos;jmikola&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DRIVERS-1958&quot; title=&quot;aggregate-write-readPreference tests should not expect readConcern to be passed to pre-4.2 servers&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DRIVERS-1958&quot;&gt;DRIVERS-1958&lt;/a&gt;: Do not expect readConcern for pre-4.2 servers (#1081)&lt;/p&gt;

&lt;p&gt;aggregate-write-readPreference tests use client-level readConcern and writeConcern options to assert that they are still inherited and passed in the aggregate command; however, readConcern is generally not supported for write stages in server versions prior to 4.2.&lt;/p&gt;

&lt;p&gt;As noted in the test comments, pre-4.2 servers may still allow a &quot;local&quot; read concern anyway, but some drivers may avoid inheriting a client-level read concern for pre-4.2. Skipping these tests for pre-4.2 servers avoids any ambiguity.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/specifications/commit/dce2c48e697e9a7d08faad871e86b415bb481df7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/specifications/commit/dce2c48e697e9a7d08faad871e86b415bb481df7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4135364" author="jmikola@gmail.com" created="Wed, 20 Oct 2021 14:46:24 +0000"  >&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/specifications/pull/1081&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/specifications/pull/1081&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1903386">PHPLIB-745</issuekey>
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            <issuekey id="1903380">CXX-2396</issuekey>
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            <issuekey id="1903384">NODE-3694</issuekey>
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            <issuekey id="1903379">CDRIVER-4195</issuekey>
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            <issuekey id="1903387">PYTHON-2954</issuekey>
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            <issuekey id="1903389">RUBY-2818</issuekey>
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                                                                <inwardlinks description="is related to">
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            <issuekey id="1128616">DRIVERS-823</issuekey>
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            <issuelink>
            <issuekey id="701001">DRIVERS-610</issuekey>
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