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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-28200] Recoverable Rollback: Extend dropIndexes oplog entry to include dropped index spec</title>
                <link>https://jira.mongodb.org/browse/SERVER-28200</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, rolling back a dropIndexes operation in the oplog requires a full resync of the collection documents and metadata.&lt;/p&gt;

&lt;p&gt;This ticket proposes to extend the oplog entry for deleteIndexes to include the specification of the index that is being dropped so that we can recreate the index on rollback without any communication with the sync source.&lt;/p&gt;

&lt;p&gt;Additionally, if there are multiple indexes dropped, a separate oplog entry should be generated for each dropped index.&lt;/p&gt;</description>
                <environment></environment>
        <key id="361737">SERVER-28200</key>
            <summary>Recoverable Rollback: Extend dropIndexes oplog entry to include dropped index spec</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="9">Done</resolution>
                                        <assignee username="judah.schvimer@mongodb.com">Judah Schvimer</assignee>
                                    <reporter username="benety.goh@mongodb.com">Benety Goh</reporter>
                        <labels>
                    </labels>
                <created>Mon, 6 Mar 2017 19:23:16 +0000</created>
                <updated>Fri, 25 Aug 2017 18:21:30 +0000</updated>
                            <resolved>Tue, 14 Mar 2017 20:14:25 +0000</resolved>
                                                    <fixVersion>3.5.5</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1523949" author="xgen-internal-githook" created="Tue, 14 Mar 2017 20:10:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;judahschvimer&apos;, u&apos;name&apos;: u&apos;Judah Schvimer&apos;, u&apos;email&apos;: u&apos;judah@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28200&quot; title=&quot;Recoverable Rollback: Extend dropIndexes oplog entry to include dropped index spec&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28200&quot;&gt;&lt;del&gt;SERVER-28200&lt;/del&gt;&lt;/a&gt; Extend dropIndexes oplog entry to include dropped index spec&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6fd95f8c1b97d72c411bc5a1c84b1d5a8efe4c07&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6fd95f8c1b97d72c411bc5a1c84b1d5a8efe4c07&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1519310" author="benety.goh" created="Wed, 8 Mar 2017 19:59:54 +0000"  >&lt;p&gt;We should examine if &lt;/p&gt;
{deleteIndexes: &amp;lt;collection&amp;gt;, index: &apos;*&apos;}
&lt;p&gt; is handled correctly when we are ready to work on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27096&quot; title=&quot;applyOps should validate its ops to ensure idempotency&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27096&quot;&gt;SERVER-27096&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1517135" author="judah.schvimer" created="Mon, 6 Mar 2017 20:14:47 +0000"  >&lt;p&gt;An alternative solution would be to have an array of index specs if we drop multiple indexes. This might risk exceeding the 16MB document limit, depending on current constraints on index spec size.&lt;/p&gt;</comment>
                            <comment id="1517117" author="judah.schvimer" created="Mon, 6 Mar 2017 19:57:33 +0000"  >&lt;p&gt;Separating the oplog entry into one for each index makes it so we no longer replicate dropIndexes atomically. This may not be a problem. Per my discussion with Benety, a solution is to log the full operation so that replication is atomic, and then also log each individual index drop for rollback.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="383427">SERVER-29191</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="420417">SERVER-30840</issuekey>
        </issuelink>
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            <issuekey id="332657">SERVER-27096</issuekey>
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