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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-35776] Add FCV 4.2 checks for change stream resume token changes</title>
                <link>https://jira.mongodb.org/browse/SERVER-35776</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="563796">SERVER-35776</key>
            <summary>Add FCV 4.2 checks for change stream resume token changes</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="charlie.swanson@mongodb.com">Charlie Swanson</assignee>
                                    <reporter username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</reporter>
                        <labels>
                    </labels>
                <created>Mon, 25 Jun 2018 15:47:39 +0000</created>
                <updated>Sun, 29 Oct 2023 22:30:28 +0000</updated>
                            <resolved>Tue, 4 Sep 2018 17:37:47 +0000</resolved>
                                                    <fixVersion>4.1.3</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1992752" author="xgen-internal-githook" created="Tue, 4 Sep 2018 17:36:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Charlie Swanson&apos;, &apos;email&apos;: &apos;charlie.swanson@mongodb.com&apos;, &apos;username&apos;: &apos;cswanson310&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35776&quot; title=&quot;Add FCV 4.2 checks for change stream resume token changes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35776&quot;&gt;&lt;del&gt;SERVER-35776&lt;/del&gt;&lt;/a&gt; Basic 4.0-4.2 up/downgrade for change streams&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/92f108d9379c8b7f7d5769ed38be517b45858b28&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/92f108d9379c8b7f7d5769ed38be517b45858b28&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1986777" author="charlie.swanson" created="Mon, 27 Aug 2018 18:13:23 +0000"  >&lt;p&gt;Ok great, thanks &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=blake.oler&quot; class=&quot;user-hover&quot; rel=&quot;blake.oler&quot;&gt;blake.oler&lt;/a&gt;. I&apos;ve started work on a simple version of this ticket that should unblock that testing.&lt;/p&gt;

&lt;p&gt;I&apos;ve filed &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36887&quot; title=&quot;Test a change stream&amp;#39;s ability to process multi-shard transactions - adjust resume token if necessary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36887&quot;&gt;&lt;del&gt;SERVER-36887&lt;/del&gt;&lt;/a&gt; to track remaining work necessary for change streams to work correctly during the 4.0 -&amp;gt; 4.2 upgrade/dowgrade cycle - but we can do something similar to what we did on 3.6 for now and it should all work okay in tests where the FCV remains constant, as I believe they would in the sharding_last_stable_mongos_and_mixed_shards suites.&lt;/p&gt;</comment>
                            <comment id="1986505" author="blake.oler" created="Mon, 27 Aug 2018 15:36:13 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=charlie.swanson&quot; class=&quot;user-hover&quot; rel=&quot;charlie.swanson&quot;&gt;charlie.swanson&lt;/a&gt; You&apos;re right &amp;#8211; the priority for this ticket is to re-enable tests disabled in the sharding_last_stable_mongos_and_mixed_shards suite (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35977&quot; title=&quot;Blacklist select change streams tests until resume token is made backwards compatible with 4.0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35977&quot;&gt;&lt;del&gt;SERVER-35977&lt;/del&gt;&lt;/a&gt;). If something quicker can be done to make the disabled tests run and pass, that would be fine for now.&lt;/p&gt;</comment>
                            <comment id="1958872" author="ian@10gen.com" created="Fri, 27 Jul 2018 18:10:38 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=charlie.swanson&quot; class=&quot;user-hover&quot; rel=&quot;charlie.swanson&quot;&gt;charlie.swanson&lt;/a&gt; it also looks like this is one of the last things in our 4.2 up/down project.  would be great if we could really finish it this iteraiton.&lt;/p&gt;</comment>
                            <comment id="1957581" author="blake.oler" created="Thu, 26 Jul 2018 16:25:02 +0000"  >&lt;p&gt;Note: Don&apos;t unblacklist update_sharded.js when this ticket is complete. Refer to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36229&quot; title=&quot;Blacklist update_sharded.js from sharding_last_stable_mongos_and_mixed_shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36229&quot;&gt;&lt;del&gt;SERVER-36229&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="1951657" author="blake.oler" created="Thu, 19 Jul 2018 19:30:15 +0000"  >&lt;p&gt;As an FYI, we&apos;re putting this into the 4.2 Upgrade/Downgrade epic so we can complete the project with a stable sharding_last_stable_mongos_and_mixed_shards suite.&lt;/p&gt;</comment>
                            <comment id="1945673" author="ian@10gen.com" created="Thu, 12 Jul 2018 16:01:58 +0000"  >&lt;p&gt;As part of this work we should unblacklist the tests blacklisted in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35977&quot; title=&quot;Blacklist select change streams tests until resume token is made backwards compatible with 4.0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35977&quot;&gt;&lt;del&gt;SERVER-35977&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="1941948" author="charlie.swanson" created="Mon, 9 Jul 2018 15:19:53 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nicholas.zolnierz&quot; class=&quot;user-hover&quot; rel=&quot;nicholas.zolnierz&quot;&gt;nicholas.zolnierz&lt;/a&gt; yes, we should do the same thing we did for the 3.6 to 4.0 upgrade, namely what was tested &lt;a href=&quot;https://github.com/mongodb/mongo/blob/v4.0/jstests/multiVersion/change_streams_feature_compatibility_version.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. You should be able to resume a change stream on the new version with a resume token from the old version, even if the FCV has been upgraded to 4.2.&lt;/p&gt;</comment>
                            <comment id="1940621" author="nicholas.zolnierz" created="Fri, 6 Jul 2018 15:30:23 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=charlie.swanson&quot; class=&quot;user-hover&quot; rel=&quot;charlie.swanson&quot;&gt;charlie.swanson&lt;/a&gt; I&apos;ve linked BF-9792 which is caused by the resume token changes from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34789&quot; title=&quot;Using resume token from an &amp;#39;invalidate&amp;#39; notification with &amp;#39;resumeAfter&amp;#39; should error&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34789&quot;&gt;&lt;del&gt;SERVER-34789&lt;/del&gt;&lt;/a&gt;. &#160;Blake recently switched on FCV 4.2 and the &quot;sharding_last_stable_mongos_and_mixed_shards&quot; suite, which runs with a 4.0 mongos and mixed bin version shards with downgraded FCVs. The 4.2 mongod&apos;s are setting the new &apos;fromInvalidate&apos; bit which of course is not understood by the 4.0 mongod&apos;s. &#160;I confirmed that adding FCV checks around the new bit will fix the tests.&lt;/p&gt;

&lt;p&gt;One question is do we always want to be able to parse the old format even when fully upgraded to 4.2? I don&apos;t think it would be possible to generate a token with the old format once upgraded, however its certainly possible to use a very old token that was generated before upgrading.&#160;&lt;/p&gt;</comment>
                            <comment id="1934845" author="ian@10gen.com" created="Fri, 29 Jun 2018 14:43:08 +0000"  >&lt;p&gt;Charlie to figure out how to schedule this given planned changes for sharded transactions.&lt;/p&gt;</comment>
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            <issuekey id="568324">SERVER-35977</issuekey>
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            <issuekey id="595351">SERVER-36887</issuekey>
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