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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-49984] Skip side writes if both keys and multikeypaths are empty</title>
                <link>https://jira.mongodb.org/browse/SERVER-49984</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When key generation encounters a suppressible error (e.g. during initial sync), &lt;a href=&quot;https://github.com/mongodb/mongo/blob/578ebc515122de8ed50b2b914d9d92ee61139b3f/src/mongo/db/index/index_access_method.cpp#L775-L777&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;we clear both the output key set and multikeypaths vector&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Even after key generation fails, we still call &lt;a href=&quot;https://github.com/mongodb/mongo/blob/578ebc515122de8ed50b2b914d9d92ee61139b3f/src/mongo/db/index/index_build_interceptor.cpp#L430&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;IndexBuildInterceptor::sideWrite&lt;/a&gt;, which can initialize _multikeypaths to a vector of zero-length, even if the actual index spec has non-trivial multikey paths. This will &lt;a href=&quot;https://github.com/mongodb/mongo/blob/578ebc515122de8ed50b2b914d9d92ee61139b3f/src/mongo/db/multi_key_path_tracker.cpp#L63&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;trigger invariants&lt;/a&gt; when attempting to merge multikeypaths from valid keys later one with non-trivial multikeypaths.&lt;/p&gt;

&lt;p&gt;To solve this problem, I think we should skip initializing/merging the _multikeypaths when both the key set and the multikeypaths are empty. This suggests that key generation failed (and cleared both containers) or there is no useful multikey information to update and no indexable keys.&lt;/p&gt;

&lt;p&gt;See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39705&quot; title=&quot;IndexBuildInterceptor does not faithfully preserve multikey when a document generates no keys&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39705&quot;&gt;&lt;del&gt;SERVER-39705&lt;/del&gt;&lt;/a&gt; which is related.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1423942">SERVER-49984</key>
            <summary>Skip side writes if both keys and multikeypaths are empty</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="13203">Gone away</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Wed, 29 Jul 2020 14:31:43 +0000</created>
                <updated>Fri, 27 Oct 2023 20:42:08 +0000</updated>
                            <resolved>Thu, 4 Mar 2021 16:59:51 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3647127" author="louis.williams" created="Thu, 4 Mar 2021 16:59:51 +0000"  >&lt;p&gt;This should be fixed by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48471&quot; title=&quot;Hashed indexes may be incorrectly marked multikey and be ineligible as a shard key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48471&quot;&gt;&lt;del&gt;SERVER-48471&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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