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    <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-46241] Ensure minVisibleSnapshots of collections created in multi-document transactions are appropriately set by the time they are visible in the catalog</title>
                <link>https://jira.mongodb.org/browse/SERVER-46241</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When a collection gets created, it gets &lt;a href=&quot;https://github.com/mongodb/mongo/blob/86674fb179041d570c01fea13d26a0bfd9e466d9/src/mongo/db/catalog/uncommitted_collections.cpp#L125&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;registered&lt;/a&gt; as part of the collection catalog during recovery unit &lt;a href=&quot;https://github.com/mongodb/mongo/blob/86674fb179041d570c01fea13d26a0bfd9e466d9/src/mongo/db/catalog/uncommitted_collections.cpp#L69&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;commit&lt;/a&gt;. Its corresponding indexes have their minVisibleTimestamp set in a separate &lt;a href=&quot;https://github.com/mongodb/mongo/blob/86674fb179041d570c01fea13d26a0bfd9e466d9/src/mongo/db/catalog/index_build_block.cpp#L202&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;onCommit handler&lt;/a&gt;. Additionally, we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9648c98f7e4879256ac5b7d5b3f7c56b9262ada8/src/mongo/db/catalog/uncommitted_collections.cpp#L137&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;set the minVisibleSnapshot&lt;/a&gt; of the newly-created collection to be a potentially &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9648c98f7e4879256ac5b7d5b3f7c56b9262ada8/src/mongo/db/catalog/database_impl.cpp#L673&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;null timestamp&lt;/a&gt;, before setting it &lt;a href=&quot;https://github.com/mongodb/mongo/blob/835e125ff9cf933ff9804d8f7ca22cca1e3a04f2/src/mongo/db/catalog/index_build_block.cpp#L205&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;again&lt;/a&gt; through creation of the _id index.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1158612">SERVER-46241</key>
            <summary>Ensure minVisibleSnapshots of collections created in multi-document transactions are appropriately set by the time they are visible in the catalog</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="maria.vankeulen@mongodb.com">Maria van Keulen</assignee>
                                    <reporter username="maria.vankeulen@mongodb.com">Maria van Keulen</reporter>
                        <labels>
                    </labels>
                <created>Tue, 18 Feb 2020 23:12:09 +0000</created>
                <updated>Sun, 29 Oct 2023 22:12:03 +0000</updated>
                            <resolved>Mon, 2 Mar 2020 18:53:19 +0000</resolved>
                                                    <fixVersion>4.3.5</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2923042" author="xgen-internal-githook" created="Mon, 2 Mar 2020 16:31:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Maria van Keulen&apos;, &apos;username&apos;: &apos;mvankeulen94&apos;, &apos;email&apos;: &apos;maria@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46241&quot; title=&quot;Ensure minVisibleSnapshots of collections created in multi-document transactions are appropriately set by the time they are visible in the catalog&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46241&quot;&gt;&lt;del&gt;SERVER-46241&lt;/del&gt;&lt;/a&gt; Set minVisibleSnapshot before new collections are visible&lt;/p&gt;

&lt;p&gt;This patch specifically addresses collections created inside multi-&lt;br/&gt;
-document transactions.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8986181de667c0eb659ee0fe5d4ae7242c282ff6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8986181de667c0eb659ee0fe5d4ae7242c282ff6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2912186" author="louis.williams" created="Wed, 26 Feb 2020 16:34:57 +0000"  >&lt;p&gt;Confirm whether this fix also fixes &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45060&quot; title=&quot;Operations can use a Collection without having a storage snapshot where that collection is visible&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45060&quot;&gt;&lt;del&gt;SERVER-45060&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2905655" author="maria.vankeulen" created="Mon, 24 Feb 2020 19:22:57 +0000"  >&lt;p&gt;We should also consider the case in which a new index is created on an empty collection created earlier in the same transaction. &lt;del&gt;A potential solution to cover both the case described in this ticket and in my comment above can be to register a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1525d54f235715d10e41711122a448bd5253588d/src/mongo/db/storage/write_unit_of_work.cpp#L109&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;pre commit hook&lt;/a&gt; instead of an onCommit handler to make the index visible. The collections themselves shouldn&apos;t be visible until after all pre commit hooks are called as of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46285&quot; title=&quot;Collections should not be visible in CollectionCatalog lookups until storage transaction commit&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46285&quot;&gt;&lt;del&gt;SERVER-46285&lt;/del&gt;&lt;/a&gt;.&lt;/del&gt;&lt;br/&gt;
Pre-commit hooks are not presently aware of the commit timestamp that gets passed to onCommit handlers. It is fine to have a window in which an index does not have a minimum visible snapshot but its owning collection does, since the reader must have access to the collection in order to view its indexes.&lt;/p&gt;</comment>
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