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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-32518] Establish snapshot timestamp for readConcern snapshot</title>
                <link>https://jira.mongodb.org/browse/SERVER-32518</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Establish a snapshot timestamp if not provided via &lt;tt&gt;&quot;atClusterTime&quot;&lt;/tt&gt; / &lt;tt&gt;&quot;afterClusterTime&quot;&lt;/tt&gt; or by a previously stashed snapshot. In &lt;tt&gt;waitForReadConcern()&lt;/tt&gt;, if &lt;tt&gt;readConcernLevel&lt;/tt&gt; is &lt;tt&gt;snapshot&lt;/tt&gt;, check whether &lt;tt&gt;getArgsPointInTime()&lt;/tt&gt; returns &lt;tt&gt;boost::none&lt;/tt&gt;, which signifies a snapshot time has yet to be established. If this is the case then we need to establish a replica set snapshot time:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Wait for a majority committed snapshot to be available (in the same manner we do for majority read concern).&lt;/li&gt;
	&lt;li&gt;Retrieve majority committed snapshot time via call to &lt;tt&gt;ReplicationCoordinator::getLastCommittedOpTime()::getTimeStamp()&lt;/tt&gt;.&lt;/li&gt;
	&lt;li&gt;Register the snapshot timestamp with WiredTiger via call to &lt;tt&gt;opCtx-&amp;gt;recoveryUnit()-&amp;gt;selectSnapshot()&lt;/tt&gt;, which is already in place for &lt;tt&gt;&quot;atClusterTime&quot;&lt;/tt&gt;.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Add handling for &lt;tt&gt;&quot;atClusterTime&quot;&lt;/tt&gt; to &lt;tt&gt;waitForReadConcern()&lt;/tt&gt;:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;If the requested time is greater than the &lt;tt&gt;lastApplied&lt;/tt&gt; time, trigger a noop write on the primary. Then wait for the majority commit point to become greater than or equal to the requested time.&lt;/li&gt;
	&lt;li&gt;Begin the read transaction at the requested time.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="477870">SERVER-32518</key>
            <summary>Establish snapshot timestamp for readConcern snapshot</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="tess.avitabile@mongodb.com">Tess Avitabile</assignee>
                                    <reporter username="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
                    </labels>
                <created>Tue, 2 Jan 2018 19:14:27 +0000</created>
                <updated>Mon, 30 Oct 2023 23:09:37 +0000</updated>
                            <resolved>Mon, 5 Feb 2018 22:23:52 +0000</resolved>
                                                    <fixVersion>3.7.2</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1796049" author="xgen-internal-githook" created="Mon, 5 Feb 2018 22:23:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;tess.avitabile@mongodb.com&apos;, &apos;name&apos;: &apos;Tess Avitabile&apos;, &apos;username&apos;: &apos;tessavitabile&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32518&quot; title=&quot;Establish snapshot timestamp for readConcern snapshot&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32518&quot;&gt;&lt;del&gt;SERVER-32518&lt;/del&gt;&lt;/a&gt; Establish snapshot timestamp for readConcern snapshot&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b696480400db1ad0485a8d0f41d0e7dd7e526335&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b696480400db1ad0485a8d0f41d0e7dd7e526335&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1763211" author="james.wahlin@10gen.com" created="Tue, 2 Jan 2018 19:41:23 +0000"  >&lt;p&gt;I expect that we don&apos;t have to explicitly check whether atClusterTime is older than the oldest WiredTiger snapshot and that the storage engine will return an error on attempting to start a WT transaction. We should test for this and make sure that error is handled gracefully.&lt;/p&gt;

&lt;p&gt;We should explicitly confirm that atClusterTime is not ahead of the majority commit timestamp.&lt;/p&gt;</comment>
                            <comment id="1763166" author="tess.avitabile" created="Tue, 2 Jan 2018 19:15:37 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=james.wahlin&quot; class=&quot;user-hover&quot; rel=&quot;james.wahlin&quot;&gt;james.wahlin&lt;/a&gt;, as part of this ticket, should we verify that the &lt;tt&gt;atClusterTime&lt;/tt&gt; timestamp is not older than the oldest WiredTiger snapshot or ahead of the majority commit timestamp?&lt;/p&gt;</comment>
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