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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-62774] Avoid copying DebugInfoSBE when recovering a plan from the SBE plan cache</title>
                <link>https://jira.mongodb.org/browse/SERVER-62774</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Each entry in the SBE plan cache, in addition to the cached SBE plan itself, holds some &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f9045f4d7b0688871499aec95eee14f27792dc81/src/mongo/db/query/plan_cache_debug_info.h#L123&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;debug info&lt;/a&gt; that is necessary to correctly populate the logs, system.profile, and so on. At the moment, when a query uses a cached plan, it will copy the debug info out of the cache. I believe that copy happens &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f9045f4d7b0688871499aec95eee14f27792dc81/src/mongo/db/query/plan_cache.h#L59&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Since the debug info is read-only, theoretically all queries using a cache entry could share the same &lt;tt&gt;DebugInfoSBE&lt;/tt&gt; object rather than making their own copy. They can&apos;t just keep a reference or raw pointer, because after looking up the entry in the cache, that plan cache entry could subsequently be evicted and the reference/pointer would become invalid. Instead, each query could hold the debug info by &lt;tt&gt;std::shared_ptr&lt;/tt&gt;. That way, the lifetime of the debug info would be extended after the corresponding plan cache entry is destroyed until all queries relying upon the debug info complete.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1967055">SERVER-62774</key>
            <summary>Avoid copying DebugInfoSBE when recovering a plan from the SBE plan cache</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="anton.korshunov@mongodb.com">Anton Korshunov</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Wed, 19 Jan 2022 21:50:39 +0000</created>
                <updated>Sun, 29 Oct 2023 21:43:55 +0000</updated>
                            <resolved>Tue, 29 Mar 2022 09:36:47 +0000</resolved>
                                                    <fixVersion>6.0.0-rc0</fixVersion>
                                    <component>Query Planning</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4440859" author="xgen-internal-githook" created="Tue, 29 Mar 2022 08:44:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Anton Korshunov&apos;, &apos;email&apos;: &apos;anton.korshunov@mongodb.com&apos;, &apos;username&apos;: &apos;antkorsh&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62774&quot; title=&quot;Avoid copying DebugInfoSBE when recovering a plan from the SBE plan cache&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62774&quot;&gt;&lt;del&gt;SERVER-62774&lt;/del&gt;&lt;/a&gt; Avoid copying DebugInfoSBE when recovering a plan from the SBE plan cache&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/80d15266187e5c83ab8202e8baa2774814cc91d2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/80d15266187e5c83ab8202e8baa2774814cc91d2&lt;/a&gt;&lt;/p&gt;</comment>
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