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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-37223] Invariant atClusterTime has been selected when creating new txn participant with snapshot read concern</title>
                <link>https://jira.mongodb.org/browse/SERVER-37223</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Mongos tracks shard participants in a transaction using participant objects created and then retrieved before when requests are sent to a shard in a transaction context. The implementation of snapshot read concern assumes an &lt;tt&gt;atClusterTime&lt;/tt&gt; has been selected for the transaction by the time any shards are targeted, but there is currently no invariant that this is true because cluster abort sends abort to all shards in the cluster, not just those involved in the transaction. So if cluster abort is the first statement in a sharded transaction, it will incorrectly create participants without selecting an &lt;tt&gt;atClusterTime&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;Once&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36589&quot; title=&quot;Implement mongos abort logic&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36589&quot;&gt;&lt;del&gt;SERVER-36589&lt;/del&gt;&lt;/a&gt; has been completed, cluster abort will only target shards that have been successfully contacted in the transaction, so the invariant that a cluster time must have been chosen can be added.&lt;/p&gt;</description>
                <environment></environment>
        <key id="607589">SERVER-37223</key>
            <summary>Invariant atClusterTime has been selected when creating new txn participant with snapshot read concern</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="jack.mulrow@mongodb.com">Jack Mulrow</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                            <label>ShardedTxn:RouterSupport</label>
                    </labels>
                <created>Thu, 20 Sep 2018 14:58:21 +0000</created>
                <updated>Sun, 29 Oct 2023 22:28:03 +0000</updated>
                            <resolved>Tue, 9 Oct 2018 13:56:51 +0000</resolved>
                                                    <fixVersion>4.1.5</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2027673" author="xgen-internal-githook" created="Tue, 9 Oct 2018 13:41:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;, &apos;username&apos;: &apos;jsmulrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37223&quot; title=&quot;Invariant atClusterTime has been selected when creating new txn participant with snapshot read concern&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37223&quot;&gt;&lt;del&gt;SERVER-37223&lt;/del&gt;&lt;/a&gt; Invariant sharded txns with snapshot read concern select atClusterTime before creating a participant&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3dc5e5979bc9a4a914b0a479e88e70078bd02552&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3dc5e5979bc9a4a914b0a479e88e70078bd02552&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2027672" author="xgen-internal-githook" created="Tue, 9 Oct 2018 13:41:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;, &apos;username&apos;: &apos;jsmulrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37223&quot; title=&quot;Invariant atClusterTime has been selected when creating new txn participant with snapshot read concern&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37223&quot;&gt;&lt;del&gt;SERVER-37223&lt;/del&gt;&lt;/a&gt; Place readConcernArgs on opCtx for subsequent statements in sharded transactions&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f2254e26b9c7bdd94e4e6613ef5a20302ecc855e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f2254e26b9c7bdd94e4e6613ef5a20302ecc855e&lt;/a&gt;&lt;/p&gt;</comment>
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