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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-33355] Support readConcern level snapshot reads on secondaries</title>
                <link>https://jira.mongodb.org/browse/SERVER-33355</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="498667">SERVER-33355</key>
            <summary>Support readConcern level snapshot reads on secondaries</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="james.wahlin@mongodb.com">James Wahlin</assignee>
                                    <reporter username="james.wahlin@mongodb.com">James Wahlin</reporter>
                        <labels>
                    </labels>
                <created>Thu, 15 Feb 2018 19:01:40 +0000</created>
                <updated>Sun, 29 Oct 2023 22:34:39 +0000</updated>
                            <resolved>Sat, 3 Mar 2018 13:36:23 +0000</resolved>
                                                    <fixVersion>3.7.3</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1822208" author="xgen-internal-githook" created="Sat, 3 Mar 2018 13:34:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;james@mongodb.com&apos;, &apos;name&apos;: &apos;James Wahlin&apos;, &apos;username&apos;: &apos;jameswahlin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33355&quot; title=&quot;Support readConcern level snapshot reads on secondaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33355&quot;&gt;&lt;del&gt;SERVER-33355&lt;/del&gt;&lt;/a&gt; Support readConcern level snapshot reads on secondaries&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/13b8e62cd9609f10688a1896cb80efa5d3c82859&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/13b8e62cd9609f10688a1896cb80efa5d3c82859&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1808332" author="judah.schvimer" created="Fri, 16 Feb 2018 18:47:28 +0000"  >&lt;p&gt;When we reenable snapshot reads on secondaries, we also need to fix readConcern_atClusterTime_snapshot_selection.js. The test stops data replication on the secondaries before waiting for them to commit the &quot;clusterTimeBefore&quot;. Given the possibility of losing a sync source, there&apos;s no way to guarantee it&#8217;ll get into the majority snapshot without the &quot;clusterTimeBefore&quot; lagging behind the commit point, which means we might no longer be able to read at that time. To fix this, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tess.avitabile&quot; class=&quot;user-hover&quot; rel=&quot;tess.avitabile&quot;&gt;tess.avitabile&lt;/a&gt; suggested the best course of action is to get the majority snapshot optime like &lt;a href=&quot;https://github.com/mongodb/mongo/blob/baf801ac03422414ca0bf9f44daac6cacc520177/src/mongo/shell/replsettest.js#L333-L338&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; and do secondary reads at that time. Since we already waited for the &quot;before&quot; write to be committed &lt;a href=&quot;https://github.com/mongodb/mongo/blob/baf801ac03422414ca0bf9f44daac6cacc520177/jstests/noPassthrough/readConcern_atClusterTime_snapshot_selection.js?utf8=%E2%9C%93#L55-L58&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;, the before write will be guaranteed to be in the majority committed snapshot when we do the read.&lt;/p&gt;</comment>
                            <comment id="1807283" author="james.wahlin@10gen.com" created="Thu, 15 Feb 2018 20:01:13 +0000"  >&lt;p&gt;One specific issue is that WiredTigerOplogManager::waitForAllEarlierOplogWritesToBeVisible(), which is called when performing snapshot reads on secondaries, will attempt to abandon the WiredTiger transaction while held in a WriteUnitOfWork, triggering an invariant.&lt;/p&gt;</comment>
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