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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-20191] multi-updates/remove can make successive queries skip shard version checking</title>
                <link>https://jira.mongodb.org/browse/SERVER-20191</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Multi-updates are currently unversioned and part of the update execution code path sets the version of the connection to &quot;ignored&quot;:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.1.7/src/mongo/db/commands/write_commands/batch_executor.cpp#L844&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.1.7/src/mongo/db/commands/write_commands/batch_executor.cpp#L844&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This is fine if the connections are used exclusively by write commands as the version information always comes together with the command request and will be reset every time. However, versioned opQuery requests are stateful and rely on the fact that the connection it uses has the shard version information in it. If a connection is initialized with a version and a multi-update/remove gets issued on the same connection afterwards, it will make the connection become &quot;unversioned&quot; for that namespace and succeeding queries using that connection will skip version checking for that namespace until a non-multi write command resets the connection version to something that is not &quot;ignored&quot;.&lt;/p&gt;

&lt;p&gt;The attached test.js demonstrates this behavior.&lt;/p&gt;</description>
                <environment></environment>
        <key id="227619">SERVER-20191</key>
            <summary>multi-updates/remove can make successive queries skip shard version checking</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="9">Done</resolution>
                                        <assignee username="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Fri, 28 Aug 2015 21:17:29 +0000</created>
                <updated>Wed, 25 Jan 2017 22:00:11 +0000</updated>
                            <resolved>Thu, 10 Sep 2015 14:07:48 +0000</resolved>
                                    <version>2.6.11</version>
                    <version>3.0.6</version>
                    <version>3.1.7</version>
                                    <fixVersion>2.6.12</fixVersion>
                    <fixVersion>3.0.7</fixVersion>
                    <fixVersion>3.1.8</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1026281" author="xgen-internal-githook" created="Thu, 10 Sep 2015 14:07:06 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;renctan&apos;, u&apos;name&apos;: u&apos;Randolph Tan&apos;, u&apos;email&apos;: u&apos;randolph@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20191&quot; title=&quot;multi-updates/remove can make successive queries skip shard version checking&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20191&quot;&gt;&lt;del&gt;SERVER-20191&lt;/del&gt;&lt;/a&gt; multi-updates/remove can make successive queries skip shard version checking&lt;/p&gt;

&lt;p&gt;(cherry picked from commit d79fdd83e4eb940d3d98f73f6f492f58c5a8dde5)&lt;/p&gt;

&lt;p&gt;Conflicts:&lt;br/&gt;
	src/mongo/db/commands/write_commands/batch_executor.cpp&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/402212e48504ff9e5c9695bfc348a967cb5a2aaf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/402212e48504ff9e5c9695bfc348a967cb5a2aaf&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1024193" author="xgen-internal-githook" created="Tue, 8 Sep 2015 15:51:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;renctan&apos;, u&apos;name&apos;: u&apos;Randolph Tan&apos;, u&apos;email&apos;: u&apos;randolph@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20191&quot; title=&quot;multi-updates/remove can make successive queries skip shard version checking&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20191&quot;&gt;&lt;del&gt;SERVER-20191&lt;/del&gt;&lt;/a&gt; multi-updates/remove can make successive queries skip shard version checking&lt;br/&gt;
Branch: v3.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d79fdd83e4eb940d3d98f73f6f492f58c5a8dde5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d79fdd83e4eb940d3d98f73f6f492f58c5a8dde5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1024101" author="xgen-internal-githook" created="Tue, 8 Sep 2015 14:36:46 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;renctan&apos;, u&apos;name&apos;: u&apos;Randolph Tan&apos;, u&apos;email&apos;: u&apos;randolph@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20191&quot; title=&quot;multi-updates/remove can make successive queries skip shard version checking&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20191&quot;&gt;&lt;del&gt;SERVER-20191&lt;/del&gt;&lt;/a&gt; multi-updates/remove can make successive queries skip shard version checking&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/526742267e208954e531c102784c0599ceba579f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/526742267e208954e531c102784c0599ceba579f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1018559" author="schwerin" created="Mon, 31 Aug 2015 19:30:55 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=renctan&quot; class=&quot;user-hover&quot; rel=&quot;renctan&quot;&gt;renctan&lt;/a&gt;, can you please describe how this can happen in the ticket description?&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="228323">SERVER-20279</issuekey>
        </issuelink>
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                                    </issuelinktype>
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                            <attachment id="88196" name="test.js" size="1075" author="randolph@mongodb.com" created="Mon, 31 Aug 2015 15:22:15 +0000"/>
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