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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-46656] Secondary and primary can disagree on index build method</title>
                <link>https://jira.mongodb.org/browse/SERVER-46656</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The two-phase index build code has an optimization to use single-phase builds on empty collections.  In this case it (correctly) writes a &quot;createIndexes&quot; oplog entry instead of the &quot;startIndexBuild&quot;/&quot;commitIndexBuild&quot; pair.  However, this optimization is bypassed on some occasions, in particular when moving the primary shard using the database cloner&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;This results in a &quot;startIndexBuild&quot;/&quot;commitIndexBuild&quot; pair being written on the primary.  However, when the secondary does the startIndexBuild, it will notice that the collection is empty and do a single-phase index build.  When the commit is executed, it will see that no build is in progress, attempt to start one, and get an IndexAlreadyExists error.&lt;/p&gt;

&lt;p&gt;I believe the fix is ensuring that the secondary never applies the optimization for startIndexBuild; if the primary did a two-phase build, the secondary should as well.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1233361">SERVER-46656</key>
            <summary>Secondary and primary can disagree on index build method</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="3">Duplicate</resolution>
                                        <assignee username="benety.goh@mongodb.com">Benety Goh</assignee>
                                    <reporter username="matthew.russotto@mongodb.com">Matthew Russotto</reporter>
                        <labels>
                    </labels>
                <created>Thu, 5 Mar 2020 18:44:58 +0000</created>
                <updated>Tue, 7 Apr 2020 04:53:01 +0000</updated>
                            <resolved>Tue, 10 Mar 2020 22:59:32 +0000</resolved>
                                                                    <component>Index Maintenance</component>
                    <component>Replication</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                    <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                            <outwardlinks description="duplicates">
                                        <issuelink>
            <issuekey id="1220181">SERVER-46603</issuekey>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="1306544">SERVER-47383</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="1266904">SERVER-46817</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="241486">SERVER-21700</issuekey>
        </issuelink>
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