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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-61160] Add dryRun option to the collMod command</title>
                <link>https://jira.mongodb.org/browse/SERVER-61160</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Running this option with the collMod command indicates that we will not attempt to convert the index.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1914343">SERVER-61160</key>
            <summary>Add dryRun option to the collMod command</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="13201">Fixed</resolution>
                                        <assignee username="benety.goh@mongodb.com">Benety Goh</assignee>
                                    <reporter username="pavithra.vetriselvan@mongodb.com">Pavithra Vetriselvan</reporter>
                        <labels>
                    </labels>
                <created>Mon, 1 Nov 2021 13:45:41 +0000</created>
                <updated>Sun, 29 Oct 2023 21:46:37 +0000</updated>
                            <resolved>Fri, 12 Nov 2021 15:09:01 +0000</resolved>
                                                    <fixVersion>5.2.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4185480" author="xgen-internal-githook" created="Fri, 12 Nov 2021 14:08:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61160&quot; title=&quot;Add dryRun option to the collMod command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61160&quot;&gt;&lt;del&gt;SERVER-61160&lt;/del&gt;&lt;/a&gt; collMod dry run mode with unique:true scans index for duplicates&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5b5fce876d4695b4429d1f311f1a2ecc66de597a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5b5fce876d4695b4429d1f311f1a2ecc66de597a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4185309" author="xgen-internal-githook" created="Fri, 12 Nov 2021 12:44:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61160&quot; title=&quot;Add dryRun option to the collMod command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61160&quot;&gt;&lt;del&gt;SERVER-61160&lt;/del&gt;&lt;/a&gt; unique option may not be combined with other modifications under collMod dry run mode&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0493dd99e7a4f21d42679c85e97f1eeb4e6dd270&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0493dd99e7a4f21d42679c85e97f1eeb4e6dd270&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4185272" author="xgen-internal-githook" created="Fri, 12 Nov 2021 12:19:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61160&quot; title=&quot;Add dryRun option to the collMod command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61160&quot;&gt;&lt;del&gt;SERVER-61160&lt;/del&gt;&lt;/a&gt; add CollModRequest::numModifications&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3ad6c069afcc4af85ffe67ab0d1efa2ef2e88786&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3ad6c069afcc4af85ffe67ab0d1efa2ef2e88786&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4185198" author="xgen-internal-githook" created="Fri, 12 Nov 2021 11:24:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61160&quot; title=&quot;Add dryRun option to the collMod command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61160&quot;&gt;&lt;del&gt;SERVER-61160&lt;/del&gt;&lt;/a&gt; disallow dry run mode for collMod under applyOps&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2fb371beb62cb41ad9c0998424e64db48efff651&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2fb371beb62cb41ad9c0998424e64db48efff651&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4184751" author="xgen-internal-githook" created="Fri, 12 Nov 2021 02:04:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61160&quot; title=&quot;Add dryRun option to the collMod command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61160&quot;&gt;&lt;del&gt;SERVER-61160&lt;/del&gt;&lt;/a&gt; add dryRun to collMod request&lt;/p&gt;

&lt;p&gt;This option directs collMod to attempt the requested modification&lt;br/&gt;
without actually updating the database state.&lt;/p&gt;

&lt;p&gt;At this time, support is limited to the unique index conversion option.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8289d8a886a1926156e19314f2f68badd1dbc754&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8289d8a886a1926156e19314f2f68badd1dbc754&lt;/a&gt;&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is documented by">
                                        <issuelink>
            <issuekey id="1995711">DOCS-15150</issuekey>
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                            <customfieldvalue>Add a new option, &amp;quot;dryRun&amp;quot;, to the collMod command that is not a part of the stable API. &lt;br/&gt;
&lt;br/&gt;
When running collMod with unique: true and dryRun: true on an existing non-unique index, the server will scan every key and check for duplicates. If duplicates are detected, it will return a CannotConvertIndexToUnique error with a list of violations. The user is expected to fix these conflicting documents before expecting a successful conversion.&lt;br/&gt;
&lt;br/&gt;
This flag is only meant to be used alongside &amp;quot;unique: true&amp;quot;. Other combinations are disallowed.</customfieldvalue>

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