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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-36659] Allow shard to choose global read timestamp when first txn statement targets one shard</title>
                <link>https://jira.mongodb.org/browse/SERVER-36659</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;To establish a global snapshot for snapshot level read concern, mongos currently selects a cluster time when executing the first statement in a transaction then sends it to each targeted shard as an&#160;&lt;tt&gt;atClusterTime&lt;/tt&gt; read concern option and will send it to each new shard contacted by subsequent statements. This guarantees all targeted shards in the transaction read from the same timestamp.&lt;/p&gt;

&lt;p&gt;If the first statement targets only one shard, mongos can instead allow the shard to select a read timestamp itself as long as the shard returns to mongos which timestamp it read from, so mongos can store it and send it to all new shard participants that may be targeted by subsequent statements, if any.&lt;/p&gt;</description>
                <environment></environment>
        <key id="588412">SERVER-36659</key>
            <summary>Allow shard to choose global read timestamp when first txn statement targets one shard</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                            <label>ShardedTxn:FutureOptimizations</label>
                            <label>pm-564</label>
                    </labels>
                <created>Tue, 14 Aug 2018 18:43:17 +0000</created>
                <updated>Tue, 6 Dec 2022 03:21:10 +0000</updated>
                            <resolved>Wed, 6 May 2020 14:26:26 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
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