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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-52557] Add mechanism to set minimal visible snapshot that is safe for lock free reads</title>
                <link>https://jira.mongodb.org/browse/SERVER-52557</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We should implement this as a way to install a special commit handler.&lt;/p&gt;

&lt;p&gt;Before &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52556&quot; title=&quot;Make multiple lookups within a snapshot from the CollectionCatalog consistent &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52556&quot;&gt;&lt;del&gt;SERVER-52556&lt;/del&gt;&lt;/a&gt; it needs to run either before the commit handler that commits the uncommitted Collection to the catalog or under the same collection catalog mutex lock that we hold while doing that move.&lt;/p&gt;

&lt;p&gt;After &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52556&quot; title=&quot;Make multiple lookups within a snapshot from the CollectionCatalog consistent &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52556&quot;&gt;&lt;del&gt;SERVER-52556&lt;/del&gt;&lt;/a&gt; it needs to run before the compare-and-swap loop that installs a new collection catalog instance.&lt;/p&gt;

&lt;p&gt;This commit handler may not modify the collection catalog and should just modify the collection instance itself.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1531354">SERVER-52557</key>
            <summary>Add mechanism to set minimal visible snapshot that is safe for lock free reads</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="henrik.edin@mongodb.com">Henrik Edin</assignee>
                                    <reporter username="henrik.edin@mongodb.com">Henrik Edin</reporter>
                        <labels>
                    </labels>
                <created>Mon, 2 Nov 2020 14:20:00 +0000</created>
                <updated>Sun, 29 Oct 2023 22:00:59 +0000</updated>
                            <resolved>Sat, 21 Nov 2020 17:40:27 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3500898" author="xgen-internal-githook" created="Sat, 21 Nov 2020 00:25:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Henrik Edin&apos;, &apos;email&apos;: &apos;henrik.edin@mongodb.com&apos;, &apos;username&apos;: &apos;henrikedin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52557&quot; title=&quot;Add mechanism to set minimal visible snapshot that is safe for lock free reads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52557&quot;&gt;&lt;del&gt;SERVER-52557&lt;/del&gt;&lt;/a&gt; Publishing a writable Collection to the catalog is done with a special commit handler that runs after all regular commit handlers.&lt;/p&gt;

&lt;p&gt;It is now safe to write to a writable Collection in a commit handler but not in a rollback handler.&lt;br/&gt;
We should not need to be able to write to a writable Collection that rolls back as the cloned instance will just be discarded.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0eb237e7f452e1d5239f7e9b7520f37c8730d0d3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0eb237e7f452e1d5239f7e9b7520f37c8730d0d3&lt;/a&gt;&lt;/p&gt;</comment>
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