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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>
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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-36212] getMore should not enforce that session id matches until FCV is 4.0</title>
                <link>https://jira.mongodb.org/browse/SERVER-36212</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Starting in 4.0 we validate that if a cursor was opened within a session then each getMore should include the same session id. Unfortunately, on 3.6 versions (up to the one in which &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34204&quot; title=&quot;Tailable cursor fails on getMore against a sharded cluster&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34204&quot;&gt;&lt;del&gt;SERVER-34204&lt;/del&gt;&lt;/a&gt; is backported, if that happens), there is a known issue where a change stream will not include the lsid. This can cause problems when upgrading to 4.0, when your mongos is old and subject to this bug (which as far as I know doesn&apos;t have much of a user impact, maybe just that it doesn&apos;t ping the session to keep it alive as frequently?), but the shards will be more strict and cause the operation to fail.&lt;/p&gt;

&lt;p&gt;To guard against this unpleasant upgrade scenario, we should only assert the getMore has a matching LSID if the FCV is at least 4.0.&lt;/p&gt;</description>
                <environment></environment>
        <key id="574021">SERVER-36212</key>
            <summary>getMore should not enforce that session id matches until FCV is 4.0</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Fri, 20 Jul 2018 15:12:33 +0000</created>
                <updated>Sun, 29 Oct 2023 22:29:41 +0000</updated>
                            <resolved>Tue, 28 Aug 2018 13:33:38 +0000</resolved>
                                    <version>4.0.1</version>
                                    <fixVersion>4.0.3</fixVersion>
                                    <component>Querying</component>
                    <component>Upgrade/Downgrade</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1987485" author="xgen-internal-githook" created="Tue, 28 Aug 2018 13:30:31 +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-36212&quot; title=&quot;getMore should not enforce that session id matches until FCV is 4.0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36212&quot;&gt;&lt;del&gt;SERVER-36212&lt;/del&gt;&lt;/a&gt; getMore shouldn&apos;t validate session id on FCV 3.6&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/90c2c3638ab249531970d3ae6257e4819254d1de&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/90c2c3638ab249531970d3ae6257e4819254d1de&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1986470" author="charlie.swanson" created="Mon, 27 Aug 2018 15:15:26 +0000"  >&lt;p&gt;Just waiting for an unfreeze of 4.0&lt;/p&gt;</comment>
                            <comment id="1953539" author="tess.avitabile" created="Mon, 23 Jul 2018 13:47:55 +0000"  >&lt;p&gt;This sounds safe to me, since transactions cannot be used with FCV 3.6, and this is only essential for cursors created within transactions.&lt;/p&gt;</comment>
                            <comment id="1952328" author="charlie.swanson" created="Fri, 20 Jul 2018 15:14:48 +0000"  >&lt;p&gt;Looks like the assertion in question was added by Tess as part of &lt;a href=&quot;https://github.com/mongodb/mongo/commit/965439580c811393eb87581f21af8684bfe41d45&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this commit&lt;/a&gt;. It&apos;s unclear which team should own this. As far as I understand: sharding team owns sessions, this was added as part of repl-set transactions work, and query owns getMore. Assigning to the query team for initial triage.&lt;/p&gt;

&lt;p&gt;cc &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jack.mulrow&quot; class=&quot;user-hover&quot; rel=&quot;jack.mulrow&quot;&gt;jack.mulrow&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tess.avitabile&quot; class=&quot;user-hover&quot; rel=&quot;tess.avitabile&quot;&gt;tess.avitabile&lt;/a&gt;&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is documented by">
                                        <issuelink>
            <issuekey id="599443">DOCS-12016</issuekey>
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            <issuekey id="519101">SERVER-34204</issuekey>
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