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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>
    </build-info>


<item>
            <title>[SERVER-58736] Avoid quadratic behavior in rollback with many collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-58736</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Copying the &lt;tt&gt;CollectionCatalog&lt;/tt&gt;&#160;is expensive. When there are tens of thousands of collections, operations like rollback become substantially slower. When the server is rolling back to the stable timestamp, the global lock is held in exclusive mode. We should be able to avoid making multiple copies of the collection catalog.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1827596">SERVER-58736</key>
            <summary>Avoid quadratic behavior in rollback with many collections</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="gregory.wlodarek@mongodb.com">Gregory Wlodarek</reporter>
                        <labels>
                    </labels>
                <created>Wed, 21 Jul 2021 18:44:20 +0000</created>
                <updated>Sun, 29 Oct 2023 21:50:36 +0000</updated>
                            <resolved>Fri, 5 Nov 2021 13:44:30 +0000</resolved>
                                    <version>5.0.0</version>
                                    <fixVersion>5.2.0</fixVersion>
                    <fixVersion>5.0.5</fixVersion>
                    <fixVersion>5.1.1</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="4195253" author="xgen-internal-githook" created="Wed, 17 Nov 2021 15:43:03 +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-58736&quot; title=&quot;Avoid quadratic behavior in rollback with many collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58736&quot;&gt;&lt;del&gt;SERVER-58736&lt;/del&gt;&lt;/a&gt; Add BatchedCollectionCatalogWriter class&lt;/p&gt;

&lt;p&gt;Allows multiple writes to be performed on the CollectionCatalog while reusing a single copy of the CollectionCatalog instance.&lt;/p&gt;

&lt;p&gt;Used when opening the catalog to avoid quadratic behavior in the number of Collections in the catalog.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 67ef8cd1ed3d15cee09de7905f7ba9fedfba176d)&lt;br/&gt;
Branch: v5.1&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2f41591c75b5ef09e804291f9be9e7fe1c75d4b0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2f41591c75b5ef09e804291f9be9e7fe1c75d4b0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4176482" author="xgen-internal-githook" created="Tue, 9 Nov 2021 00:14:17 +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-58736&quot; title=&quot;Avoid quadratic behavior in rollback with many collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58736&quot;&gt;&lt;del&gt;SERVER-58736&lt;/del&gt;&lt;/a&gt; Add BatchedCollectionCatalogWriter class&lt;/p&gt;

&lt;p&gt;Allows multiple writes to be performed on the CollectionCatalog while reusing a single copy of the CollectionCatalog instance.&lt;/p&gt;

&lt;p&gt;Used when opening the catalog to avoid quadratic behavior in the number of Collections in the catalog.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 67ef8cd1ed3d15cee09de7905f7ba9fedfba176d)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/45d16ad9a503ee7398894c3b117e6e05262aad33&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/45d16ad9a503ee7398894c3b117e6e05262aad33&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4171374" author="xgen-internal-githook" created="Fri, 5 Nov 2021 13:09:44 +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-58736&quot; title=&quot;Avoid quadratic behavior in rollback with many collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58736&quot;&gt;&lt;del&gt;SERVER-58736&lt;/del&gt;&lt;/a&gt; Add BatchedCollectionCatalogWriter class&lt;/p&gt;

&lt;p&gt;Allows multiple writes to be performed on the CollectionCatalog while reusing a single copy of the CollectionCatalog instance.&lt;/p&gt;

&lt;p&gt;Used when opening the catalog to avoid quadratic behavior in the number of Collections in the catalog.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/67ef8cd1ed3d15cee09de7905f7ba9fedfba176d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/67ef8cd1ed3d15cee09de7905f7ba9fedfba176d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4104121" author="gregory.wlodarek" created="Wed, 6 Oct 2021 01:50:05 +0000"  >&lt;p&gt;I&apos;ve reverted the original fix for this. Performing writes in-place while the exclusive global lock is held in the CollectionCatalog made it unsafe for other callers to call &lt;tt&gt;CollectionCatalog::get()&lt;/tt&gt; without a global lock. Our &lt;tt&gt;AutoGetCollection*&lt;/tt&gt; helpers don&apos;t follow this pattern, so to avoid future issues with reading the CollectionCatalog while it&apos;s being written to in-place, this change was reverted. There has also been a handful of BFs as a cause of this change.&lt;/p&gt;

&lt;p&gt;I spoke with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=henrik.edin&quot; class=&quot;user-hover&quot; rel=&quot;henrik.edin&quot;&gt;henrik.edin&lt;/a&gt; about this, and one solution that&apos;s more involved would be to create a &lt;tt&gt;CollectionCatalog::write()&lt;/tt&gt; function that performs operations in batches. But this will need more investigation.&lt;/p&gt;</comment>
                            <comment id="4104100" author="xgen-internal-githook" created="Wed, 6 Oct 2021 01:33:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58736&quot; title=&quot;Avoid quadratic behavior in rollback with many collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58736&quot;&gt;&lt;del&gt;SERVER-58736&lt;/del&gt;&lt;/a&gt; Avoid quadratic behavior in rollback with many collections&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 2bc550f5f4d47b6ae2ca176acc2865f1f4a8035a.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ed1a1de3bbf155f9e14ad536f47771b9c8ba2561&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ed1a1de3bbf155f9e14ad536f47771b9c8ba2561&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4104099" author="xgen-internal-githook" created="Wed, 6 Oct 2021 01:33:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58736&quot; title=&quot;Avoid quadratic behavior in rollback with many collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58736&quot;&gt;&lt;del&gt;SERVER-58736&lt;/del&gt;&lt;/a&gt; Add benchmark for CollectionCatalog::write()&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 9ced8a4e161b258ed9090645065f330af65ee20b.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c7739cfe47ea9099188580022a334e335e4b42ef&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c7739cfe47ea9099188580022a334e335e4b42ef&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4104088" author="xgen-internal-githook" created="Wed, 6 Oct 2021 01:24:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58736&quot; title=&quot;Avoid quadratic behavior in rollback with many collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58736&quot;&gt;&lt;del&gt;SERVER-58736&lt;/del&gt;&lt;/a&gt; Avoid quadratic behavior in rollback with many collections&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 2bc550f5f4d47b6ae2ca176acc2865f1f4a8035a.&lt;br/&gt;
Branch: v5.1&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/08a1d17ecceb1a7e0ea969c61f1e0f11d672e6c2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/08a1d17ecceb1a7e0ea969c61f1e0f11d672e6c2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4104087" author="xgen-internal-githook" created="Wed, 6 Oct 2021 01:24:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58736&quot; title=&quot;Avoid quadratic behavior in rollback with many collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58736&quot;&gt;&lt;del&gt;SERVER-58736&lt;/del&gt;&lt;/a&gt; Add benchmark for CollectionCatalog::write()&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 9ced8a4e161b258ed9090645065f330af65ee20b.&lt;br/&gt;
Branch: v5.1&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5d0357fb1120639d34505c8b4298fa8c5efd45f7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5d0357fb1120639d34505c8b4298fa8c5efd45f7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4103961" author="xgen-internal-githook" created="Tue, 5 Oct 2021 23:16:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58736&quot; title=&quot;Avoid quadratic behavior in rollback with many collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58736&quot;&gt;&lt;del&gt;SERVER-58736&lt;/del&gt;&lt;/a&gt; Avoid quadratic behavior in rollback with many collections&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit bfd27ee94c2d81b50e339011cba52dcf0a3625e2.&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9a35771a2de9db3f10a606d8aed1edd33aba9568&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9a35771a2de9db3f10a606d8aed1edd33aba9568&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4103959" author="xgen-internal-githook" created="Tue, 5 Oct 2021 23:16:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58736&quot; title=&quot;Avoid quadratic behavior in rollback with many collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58736&quot;&gt;&lt;del&gt;SERVER-58736&lt;/del&gt;&lt;/a&gt; Add benchmark for CollectionCatalog::write()&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit d2229dd0ad45f79ed4ea01bb502f5cc48b232d70.&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/06dfff7d3b02c48e8dfe5b01ce9bb7c545c4d402&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/06dfff7d3b02c48e8dfe5b01ce9bb7c545c4d402&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4072700" author="xgen-internal-githook" created="Mon, 20 Sep 2021 20:40:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58736&quot; title=&quot;Avoid quadratic behavior in rollback with many collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58736&quot;&gt;&lt;del&gt;SERVER-58736&lt;/del&gt;&lt;/a&gt; Add benchmark for CollectionCatalog::write()&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 9ced8a4e161b258ed9090645065f330af65ee20b)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d2229dd0ad45f79ed4ea01bb502f5cc48b232d70&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d2229dd0ad45f79ed4ea01bb502f5cc48b232d70&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4072699" author="xgen-internal-githook" created="Mon, 20 Sep 2021 20:40:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58736&quot; title=&quot;Avoid quadratic behavior in rollback with many collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58736&quot;&gt;&lt;del&gt;SERVER-58736&lt;/del&gt;&lt;/a&gt; Avoid quadratic behavior in rollback with many collections&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 2bc550f5f4d47b6ae2ca176acc2865f1f4a8035a)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bfd27ee94c2d81b50e339011cba52dcf0a3625e2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bfd27ee94c2d81b50e339011cba52dcf0a3625e2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3975493" author="xgen-internal-githook" created="Mon, 2 Aug 2021 14:40:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58736&quot; title=&quot;Avoid quadratic behavior in rollback with many collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58736&quot;&gt;&lt;del&gt;SERVER-58736&lt;/del&gt;&lt;/a&gt; Add benchmark for CollectionCatalog::write()&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9ced8a4e161b258ed9090645065f330af65ee20b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9ced8a4e161b258ed9090645065f330af65ee20b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3975491" author="xgen-internal-githook" created="Mon, 2 Aug 2021 14:40:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58736&quot; title=&quot;Avoid quadratic behavior in rollback with many collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58736&quot;&gt;&lt;del&gt;SERVER-58736&lt;/del&gt;&lt;/a&gt; Avoid quadratic behavior in rollback with many collections&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2bc550f5f4d47b6ae2ca176acc2865f1f4a8035a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2bc550f5f4d47b6ae2ca176acc2865f1f4a8035a&lt;/a&gt;&lt;/p&gt;</comment>
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