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    <title>MongoDB Jira</title>
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    <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-36888] Performance regression of operations in multi-document transactions required to check index catalog metadata more frequently</title>
                <link>https://jira.mongodb.org/browse/SERVER-36888</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A performance regression for operations in multi-document transactions was introduced by both&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35789&quot; title=&quot;check for index catalog isready mismatch for multi-doc txns&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35789&quot;&gt;&lt;del&gt;SERVER-35789&lt;/del&gt;&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36005&quot; title=&quot;`IndexCatalogEntryImpl::_catalogIsReady` is unsafe to unconditionally call.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36005&quot;&gt;&lt;del&gt;SERVER-36005&lt;/del&gt;&lt;/a&gt;. These changes require all callers of &lt;a href=&quot;https://github.com/mongodb/mongo/blob/57d007e00124d18e94c204e3968b53f83c01f1b7/src/mongo/db/catalog/index_catalog_entry_impl.cpp#L164-L180&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;IndexCatalogEntry::isReady&lt;/a&gt; to confirm that the catalog metadata on-disk is consistent with the in-memory version. This method is called any time the query system uses, or considers using any single index.&lt;/p&gt;

&lt;p&gt;In certain bulk update workloads, the effects of both commits showed a combined regression of up to a &lt;b&gt;38% decrease&lt;/b&gt; in write throughput compared to previous test runs.&lt;/p&gt;

&lt;p&gt;This was previously a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/57d007e00124d18e94c204e3968b53f83c01f1b7/src/mongo/db/catalog/index_catalog_entry_impl.cpp#L178&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;DEV invariant&lt;/a&gt; that was only executed in Debug builds. It used to be a fairly inexpensive call, but it&apos;s prevalence in code accompanied with its performance hit caused quite a significant regression.&lt;/p&gt;</description>
                <environment></environment>
        <key id="595355">SERVER-36888</key>
            <summary>Performance regression of operations in multi-document transactions required to check index catalog metadata more frequently</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="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                            <label>nyc</label>
                    </labels>
                <created>Mon, 27 Aug 2018 18:22:35 +0000</created>
                <updated>Sun, 29 Oct 2023 22:28:37 +0000</updated>
                            <resolved>Tue, 27 Nov 2018 21:06:16 +0000</resolved>
                                    <version>4.0.1</version>
                    <version>4.1.1</version>
                                    <fixVersion>4.1.6</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="2073388" author="louis.williams" created="Tue, 27 Nov 2018 21:06:16 +0000"  >&lt;p&gt;This regression has been fixed by the index catalog iterator refactor introduced in&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37263&quot; title=&quot;New IAM for hybrid&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37263&quot;&gt;&lt;del&gt;SERVER-37263&lt;/del&gt;&lt;/a&gt;.&#160;&lt;/p&gt;</comment>
                            <comment id="1990863" author="ian@10gen.com" created="Fri, 31 Aug 2018 14:54:08 +0000"  >&lt;p&gt;This probably won&apos;t require any specific/dedicated work in 4.1, but the intent is for the Simultaneous Indexing on All Nodes project to introduce a fix for this in 4.1.  Just need to double check on this fact before closing this ticket.&lt;/p&gt;</comment>
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