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    <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-29792] Write multiversion tests for causal consistency</title>
                <link>https://jira.mongodb.org/browse/SERVER-29792</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Verify the following mixed version scenarios (from the design doc):&lt;/p&gt;

&lt;p&gt;v3.6 primary and v3.4 secondary replica set node&lt;/p&gt;

&lt;p&gt;The primary will be sending out the clusterTime but the old secondaries will ignore it. This is fine, this just means that the old secondaries won&apos;t be able to help in propagating the clock. The drivers won&apos;t be able to use afterClusterTime on the v3.4 secondaries because it will result in parse error.&lt;/p&gt;

&lt;p&gt;v3.4 primary and v3.6 secondary replica set node&lt;/p&gt;

&lt;p&gt;v3.6 mongos and v3.4 shard is not valid configuration, so the case where v3.6 mongos learns about a new LogicalTime from a different v3.6 shard and tries to talk to a replica set shard with v3.4 primary can be discounted (this can end up blocking until the no-op writer writes an oplog entry).&lt;/p&gt;

&lt;p&gt;In a valid configuration where the replica set primary is in v3.4, then it means that replica set will never advance LogicalTime_MEM. This is okay, since the LogicalTime_MEM advancement is only important in a replica set if it is part of a sharded cluster and when the client wants to do causal reads (which it can&apos;t since it still has yet to upgrade the mongos).&lt;/p&gt;

&lt;p&gt;v3.6 mongod and v3.4 mongos&lt;/p&gt;

&lt;p&gt;Clients will get parse errors when they try to use afterClusterTime.&lt;/p&gt;</description>
                <environment></environment>
        <key id="396972">SERVER-29792</key>
            <summary>Write multiversion tests for causal consistency</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="13201">Fixed</resolution>
                                        <assignee username="misha.tyulenev@mongodb.com">Misha Tyulenev</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                            <label>PM-221</label>
                    </labels>
                <created>Thu, 22 Jun 2017 14:30:47 +0000</created>
                <updated>Mon, 30 Oct 2023 23:15:49 +0000</updated>
                            <resolved>Tue, 10 Oct 2017 22:05:41 +0000</resolved>
                                                    <fixVersion>3.6.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1695347" author="xgen-internal-githook" created="Tue, 10 Oct 2017 22:04:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;misha@mongodb.com&apos;, &apos;name&apos;: &apos;Misha Tyulenev&apos;, &apos;username&apos;: &apos;mikety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29792&quot; title=&quot;Write multiversion tests for causal consistency&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29792&quot;&gt;&lt;del&gt;SERVER-29792&lt;/del&gt;&lt;/a&gt; upgrade / downgrade replica set tests for causal consistncy&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/662632bf21694d9bf9edf53247eb9803a2b4a2c2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/662632bf21694d9bf9edf53247eb9803a2b4a2c2&lt;/a&gt;&lt;/p&gt;</comment>
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