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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>
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<item>
            <title>[SERVER-61996] Improve performance of DocumentStorage::appendField</title>
                <link>https://jira.mongodb.org/browse/SERVER-61996</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Some tsbs_query workloads such as &lt;tt&gt;high-cpu-all&lt;/tt&gt; spend a lot of time in bucket unpacking. Timeseries bucket compression made this slower but the slowest part of bucket unpacking is &lt;tt&gt;DocumentStorage::appendField&lt;/tt&gt; where around 25% of CPU time is spent.&lt;/p&gt;

&lt;p&gt;We should look into how we can make this faster. At least not re-hash the same field name over and over again.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1946949">SERVER-61996</key>
            <summary>Improve performance of DocumentStorage::appendField</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="dan.larkin-york@mongodb.com">Dan Larkin-York</assignee>
                                    <reporter username="henrik.edin@mongodb.com">Henrik Edin</reporter>
                        <labels>
                    </labels>
                <created>Sat, 11 Dec 2021 01:02:33 +0000</created>
                <updated>Sun, 29 Oct 2023 21:45:09 +0000</updated>
                            <resolved>Wed, 22 Dec 2021 17:19:26 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                    <fixVersion>5.2.1</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4303506" author="xgen-internal-githook" created="Thu, 20 Jan 2022 17:52:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dan Larkin-York&apos;, &apos;email&apos;: &apos;dan.larkin-york@mongodb.com&apos;, &apos;username&apos;: &apos;dhly-etc&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61996&quot; title=&quot;Improve performance of DocumentStorage::appendField&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61996&quot;&gt;&lt;del&gt;SERVER-61996&lt;/del&gt;&lt;/a&gt; Reserve memory for MutableDocument in BucketUnpacker::getNext()&lt;br/&gt;
Branch: v5.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cbb0c786e336f837085795bb0469b47f3f029398&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cbb0c786e336f837085795bb0469b47f3f029398&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4275025" author="JIRAUSER1258161" created="Tue, 4 Jan 2022 21:09:38 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jonathan.streets&quot; class=&quot;user-hover&quot; rel=&quot;jonathan.streets&quot;&gt;jonathan.streets&lt;/a&gt; I didn&apos;t notice the sys-perf-5.2 tag. Yes, this will need to be backported.&lt;/p&gt;</comment>
                            <comment id="4264252" author="xgen-internal-githook" created="Wed, 22 Dec 2021 16:49:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dan Larkin-York&apos;, &apos;email&apos;: &apos;dan.larkin-york@mongodb.com&apos;, &apos;username&apos;: &apos;dhly-etc&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61996&quot; title=&quot;Improve performance of DocumentStorage::appendField&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61996&quot;&gt;&lt;del&gt;SERVER-61996&lt;/del&gt;&lt;/a&gt; Reserve memory for MutableDocument in BucketUnpacker::getNext()&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d269dd586a99b2e6c05710543c66f958afa7ffe4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d269dd586a99b2e6c05710543c66f958afa7ffe4&lt;/a&gt;&lt;/p&gt;</comment>
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