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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-80194] In sharded_agg_helpers.cpp we retrieve CollectionRoutingInfo without checking for transaction</title>
                <link>https://jira.mongodb.org/browse/SERVER-80194</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We now use CollectionRoutingInfo, provided by CollectionRouter for out shard targeting: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5c14aa402e3cbab58d8de1e891f00e91deb023e5/src/mongo/db/pipeline/sharded_agg_helpers.cpp#L1797&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/5c14aa402e3cbab58d8de1e891f00e91deb023e5/src/mongo/db/pipeline/sharded_agg_helpers.cpp#L1797&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;But we used to call getExecutionNsRoutingInfo function instead:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/5c14aa402e3cbab58d8de1e891f00e91deb023e5/src/mongo/db/pipeline/sharded_agg_helpers.cpp#L851&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/5c14aa402e3cbab58d8de1e891f00e91deb023e5/src/mongo/db/pipeline/sharded_agg_helpers.cpp#L851&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;The core difference is that it accounts for snapshot isolation transactions: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5c14aa402e3cbab58d8de1e891f00e91deb023e5/src/mongo/s/cluster_commands_helpers.cpp#L791&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/5c14aa402e3cbab58d8de1e891f00e91deb023e5/src/mongo/s/cluster_commands_helpers.cpp#L791&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;We should add a test to check if there is a problem and fix it.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2419876">SERVER-80194</key>
            <summary>In sharded_agg_helpers.cpp we retrieve CollectionRoutingInfo without checking for transaction</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="ivan.fefer@mongodb.com">Ivan Fefer</assignee>
                                    <reporter username="ivan.fefer@mongodb.com">Ivan Fefer</reporter>
                        <labels>
                    </labels>
                <created>Thu, 17 Aug 2023 13:22:44 +0000</created>
                <updated>Sun, 29 Oct 2023 21:17:24 +0000</updated>
                            <resolved>Tue, 22 Aug 2023 14:27:17 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5650328" author="xgen-internal-githook" created="Tue, 22 Aug 2023 14:23:33 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Ivan Fefer&apos;, &apos;email&apos;: &apos;ivan.fefer@mongodb.com&apos;, &apos;username&apos;: &apos;Fefer-Ivan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80194&quot; title=&quot;In sharded_agg_helpers.cpp we retrieve CollectionRoutingInfo without checking for transaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80194&quot;&gt;&lt;del&gt;SERVER-80194&lt;/del&gt;&lt;/a&gt; Fix subpipeline targeting&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d0bc2ec9e1fa0b0c998f8af03e91df97b48fcecc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d0bc2ec9e1fa0b0c998f8af03e91df97b48fcecc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5646901" author="JIRAUSER1270969" created="Mon, 21 Aug 2023 14:36:27 +0000"  >&lt;p&gt;Okay, several good news:&lt;br/&gt;
1. I tried a lot of different ways to reproduce the potential issue and in most cases everything works correctly.&lt;/p&gt;

&lt;p&gt;2. When it doesn&apos;t work, query fails instead of returning incorrect result.&lt;/p&gt;

&lt;p&gt;3. The only way to make it fail is to use movePrimary, which is extremely rare in practice.&lt;/p&gt;

&lt;p&gt;Still, this is something we would like to fix, as it can cause some problems in the future.&lt;/p&gt;</comment>
                            <comment id="5642539" author="JIRAUSER1270969" created="Fri, 18 Aug 2023 10:14:54 +0000"  >&lt;p&gt;There is a jstest for this behaviour: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/jstests/sharding/snapshot_reads_target_at_point_in_time.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/jstests/sharding/snapshot_reads_target_at_point_in_time.js&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
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                    <name>Problem/Incident</name>
                                                                <inwardlinks description="is caused by">
                                        <issuelink>
            <issuekey id="2349361">SERVER-77427</issuekey>
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