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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-36557] Every command that can start a cross-shard transaction should compute atClusterTime with snapshot read concern</title>
                <link>https://jira.mongodb.org/browse/SERVER-36557</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The first command in a transaction is the only one that can provide a read concern, and if a transaction runs with snapshot level read concern all targeted shards must use the same &lt;tt&gt;atClusterTime&lt;/tt&gt; timestamp. This means every command that can start a transaction must be able to compute an &lt;tt&gt;atClusterTime&lt;/tt&gt; so it can be sent to all shards targeted by the first statement.&lt;/p&gt;

&lt;p&gt;These commands currently include:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;find&lt;/li&gt;
	&lt;li&gt;killCursors&lt;/li&gt;
	&lt;li&gt;insert&lt;/li&gt;
	&lt;li&gt;update&lt;/li&gt;
	&lt;li&gt;delete&lt;/li&gt;
	&lt;li&gt;findAndModify&lt;/li&gt;
	&lt;li&gt;aggregate&lt;/li&gt;
	&lt;li&gt;distinct&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Note: &lt;tt&gt;geoSearch&lt;/tt&gt; can start a single replica set transaction, but the command is not supported on mongos&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;find&lt;/tt&gt;, &lt;tt&gt;aggregate&lt;/tt&gt;, and &lt;tt&gt;distinct&lt;/tt&gt; already support this from the global point in time reads project, leaving&#160;&lt;tt&gt;insert&lt;/tt&gt;, &lt;tt&gt;update&lt;/tt&gt;, &lt;tt&gt;delete&lt;/tt&gt;, &lt;tt&gt;findAndModify&lt;/tt&gt;, and &lt;tt&gt;killCursors&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="586086">SERVER-36557</key>
            <summary>Every command that can start a cross-shard transaction should compute atClusterTime 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:GlobalSnapshot</label>
                    </labels>
                <created>Thu, 9 Aug 2018 17:02:01 +0000</created>
                <updated>Sun, 29 Oct 2023 22:29:06 +0000</updated>
                            <resolved>Fri, 7 Sep 2018 14:09:13 +0000</resolved>
                                                    <fixVersion>4.1.3</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1996295" author="xgen-internal-githook" created="Fri, 7 Sep 2018 14:08:37 +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-36557&quot; title=&quot;Every command that can start a cross-shard transaction should compute atClusterTime with snapshot read concern&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36557&quot;&gt;&lt;del&gt;SERVER-36557&lt;/del&gt;&lt;/a&gt; Compute atClusterTime when killCursors is the first command in a sharded transaction&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/750dea991cfa27e84fb3e3deacdf2f8e292571bb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/750dea991cfa27e84fb3e3deacdf2f8e292571bb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1995872" author="xgen-internal-githook" created="Thu, 6 Sep 2018 22:58:20 +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-36557&quot; title=&quot;Every command that can start a cross-shard transaction should compute atClusterTime with snapshot read concern&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36557&quot;&gt;&lt;del&gt;SERVER-36557&lt;/del&gt;&lt;/a&gt; Compute atClusterTime for cluster batch writes and findAndModify&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3257bb958a29a23d5101a16c49d97536e5fba056&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3257bb958a29a23d5101a16c49d97536e5fba056&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1989247" author="greg.mckeon" created="Wed, 29 Aug 2018 19:46:59 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jack.mulrow&quot; class=&quot;user-hover&quot; rel=&quot;jack.mulrow&quot;&gt;jack.mulrow&lt;/a&gt; handing back to you.&lt;/p&gt;</comment>
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