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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-46378] Support continuing a transaction started by mongos (or different shard) on a shard</title>
                <link>https://jira.mongodb.org/browse/SERVER-46378</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As described in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46373&quot; title=&quot;Allow an aggregation sub-operation on a shard to target itself when running in a transaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46373&quot;&gt;SERVER-46373&lt;/a&gt;, an aggregation pipeline may contain a stage which itself reads from a different collection from which the original command was run against. The remote requests for the sub-operation will generally fall into one of two buckets:&lt;/p&gt;

&lt;p&gt;1. The targeted shard has already been contacted by mongos and already has knowledge of the transaction details. As long as the shard that&apos;s acting as a router correctly appends the txn information, then the recipient shard will respond to the query as if it was sent from mongos.&lt;br/&gt;
2. The targeted shard has not been contacted yet and thus has no knowledge of the transaction. In this case, the shard acting as a router needs to instruct the shard to start a new transaction. Currently mongos uses a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f9ffddf06c92abcfa6acf632da69346bd852adfc/src/mongo/db/logical_session_id.idl#L131&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;startTransaction&lt;/a&gt; flag  to achieve this. We could use a similar mechanism here, however blindly attaching the flag will not work due to the case described in (1) and there&apos;s a specific state machine that&apos;s expected for each participant.&lt;/p&gt;

&lt;p&gt;Note that solving the above issue is half of the battle, as additional participants of the sub-operation need to be conveyed back to mongos to be used in the commit and readConcern enforcement. &lt;/p&gt;</description>
                <environment></environment>
        <key id="1182358">SERVER-46378</key>
            <summary>Support continuing a transaction started by mongos (or different shard) on a shard</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-sharding-nyc">[DO NOT USE] Backlog - Sharding NYC</assignee>
                                    <reporter username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</reporter>
                        <labels>
                            <label>sharding-common-backlog</label>
                    </labels>
                <created>Mon, 24 Feb 2020 21:08:41 +0000</created>
                <updated>Fri, 19 May 2023 15:26:53 +0000</updated>
                            <resolved>Fri, 19 May 2023 15:26:53 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>5</watches>
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            <issuekey id="1088748">SERVER-45542</issuekey>
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