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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-58712] Inconsistent update performance on collections with multiple secondary indexes on same key</title>
                <link>https://jira.mongodb.org/browse/SERVER-58712</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Update performance appears to suffer greatly if there are multiple secondary indexes with the same first field in a key. This does not appear to have an obvious reason, because using a hint improves performance significantly.&lt;/p&gt;

&lt;p&gt;For example:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Say collection has two secondary indexes 
{a: 1, b: 1}
&lt;p&gt; and &lt;/p&gt;
{a: 1, c: 1}
&lt;p&gt; with 100K documents&lt;/p&gt;&lt;/li&gt;
	&lt;li&gt;Perform a multi update on 
{a: &amp;lt;value&amp;gt;}&lt;/li&gt;
	&lt;li&gt;This query takes 4 minutes. If an index is dropped or a hint is used, the same query performance improves to around 200ms.&lt;/li&gt;
	&lt;li&gt;As additional indexes are added, performance degrades linearly&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;In the server ticket &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57095?filter=-1&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-57095?filter=-1&lt;/a&gt;, adding the hint decreased the query time by several minutes. From 5 minutes without the hint to about 14 seconds after the hint was added.&lt;/p&gt;

&lt;p&gt;If you run the attach replication test you&apos;ll see that without the hint it takes 234,335 milliseconds and with the hint it takes 3,347 milliseconds.&lt;/p&gt;

&lt;p&gt;Seems to be related to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57221&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-57221&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1826231">SERVER-58712</key>
            <summary>Inconsistent update performance on collections with multiple secondary indexes on same key</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="ivan.fefer@mongodb.com">Ivan Fefer</assignee>
                                    <reporter username="luis.osta@mongodb.com">Luis Osta</reporter>
                        <labels>
                    </labels>
                <created>Tue, 20 Jul 2021 20:12:31 +0000</created>
                <updated>Sun, 29 Oct 2023 21:50:37 +0000</updated>
                            <resolved>Thu, 29 Sep 2022 07:41:42 +0000</resolved>
                                                    <fixVersion>5.0.15</fixVersion>
                    <fixVersion>6.0.4</fixVersion>
                    <fixVersion>6.2.0-rc0</fixVersion>
                                    <component>Query Execution</component>
                                        <votes>0</votes>
                                    <watches>19</watches>
                                                                                                                <comments>
                            <comment id="5025157" author="xgen-internal-githook" created="Fri, 2 Dec 2022 14:28:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ivan Fefer&apos;, &apos;email&apos;: &apos;ivan.fefer@mongodb.com&apos;, &apos;username&apos;: &apos;Fefer-Ivan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58712&quot; title=&quot;Inconsistent update performance on collections with multiple secondary indexes on same key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58712&quot;&gt;&lt;del&gt;SERVER-58712&lt;/del&gt;&lt;/a&gt;: Fix update performance on collections with multiple secondary indexes on same key&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 1d93d09948c29534f7c82950ba7771ac0f4da22c)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e0464c5e9031f851e955ce5ad4583b3c9caa0d74&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e0464c5e9031f851e955ce5ad4583b3c9caa0d74&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5024825" author="xgen-internal-githook" created="Fri, 2 Dec 2022 11:33:22 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ivan Fefer&apos;, &apos;email&apos;: &apos;ivan.fefer@mongodb.com&apos;, &apos;username&apos;: &apos;Fefer-Ivan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58712&quot; title=&quot;Inconsistent update performance on collections with multiple secondary indexes on same key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58712&quot;&gt;&lt;del&gt;SERVER-58712&lt;/del&gt;&lt;/a&gt;: Fix update performance on collections with multiple secondary indexes on same key&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 1d93d09948c29534f7c82950ba7771ac0f4da22c)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/184d528d491daa53a06230e316f097b625d6e9dd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/184d528d491daa53a06230e316f097b625d6e9dd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5021721" author="JIRAUSER1270969" created="Thu, 1 Dec 2022 12:31:24 +0000"  >&lt;p&gt;If we are backporting this ticket, then we also should backport this one &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70394&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-70394&lt;/a&gt; - a small fix for a small bug in this commit.&lt;/p&gt;</comment>
                            <comment id="4864226" author="xgen-internal-githook" created="Thu, 29 Sep 2022 07:39:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ivan Fefer&apos;, &apos;email&apos;: &apos;ivan.fefer@mongodb.com&apos;, &apos;username&apos;: &apos;Fefer-Ivan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58712&quot; title=&quot;Inconsistent update performance on collections with multiple secondary indexes on same key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58712&quot;&gt;&lt;del&gt;SERVER-58712&lt;/del&gt;&lt;/a&gt;: Fix update performance on collections with multiple secondary indexes on same key&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1d93d09948c29534f7c82950ba7771ac0f4da22c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1d93d09948c29534f7c82950ba7771ac0f4da22c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4862336" author="xgen-internal-githook" created="Wed, 28 Sep 2022 16:30:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ivan Fefer&apos;, &apos;email&apos;: &apos;fefer.ivan@gmail.com&apos;, &apos;username&apos;: &apos;Fefer-Ivan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58712&quot; title=&quot;Inconsistent update performance on collections with multiple secondary indexes on same key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58712&quot;&gt;&lt;del&gt;SERVER-58712&lt;/del&gt;&lt;/a&gt;: Add UpdateWithSecondaryIndexes workload (#739)&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/genny/commit/569579530a9f60abc8af265d48a1ae60538d8586&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/genny/commit/569579530a9f60abc8af265d48a1ae60538d8586&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4857751" author="JIRAUSER1270969" created="Tue, 27 Sep 2022 10:07:47 +0000"  >&lt;p&gt;I reproduced the issue using provided jstest.&#160;&lt;/p&gt;

&lt;p&gt;The reason is MultiPlanStage: when we don&apos;t add a hint, plans for both indexes are generated, but when MultiPlanStage is done choosing plan, rejected plans are still persist in memory and may hold some locks, slowing down updates.&#160;&lt;/p&gt;

&lt;p&gt;Fix should be easy: MultiPlanStage owns all children and need to delete them after plan is chosen. Some care need to be taken with backup plan logic.&lt;/p&gt;</comment>
                            <comment id="4653022" author="JIRAUSER1259232" created="Fri, 1 Jul 2022 15:28:45 +0000"  >&lt;p&gt;As per discussion thread in related ticket of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57221&quot; title=&quot;Inconsistent delete performance on collections with multiple secondary indexes on same key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57221&quot;&gt;&lt;del&gt;SERVER-57221&lt;/del&gt;&lt;/a&gt; ,&#160; &lt;a href=&quot;https://jira.mongodb.org/browse/PM-2317&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;PM-2317&lt;/a&gt; could also help this issue.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Alternatively, restoreState for candidate plans ideally should be called just before the backup plan is chosen.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Keeping this ticket open so the perf gains in PM-2317 can be confirmed first.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="4009886" author="JIRAUSER1257467" created="Thu, 19 Aug 2021 15:08:58 +0000"  >&lt;p&gt;We believe that is the same issue as &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57221&quot; title=&quot;Inconsistent delete performance on collections with multiple secondary indexes on same key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57221&quot;&gt;&lt;del&gt;SERVER-57221&lt;/del&gt;&lt;/a&gt;&#160;and the two should be addressed together if possible&#160;&lt;/p&gt;</comment>
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