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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>
    </build-info>


<item>
            <title>[SERVER-40990] If a createIndexes request specifies two identical indexes, a IndexAlreadyExists error is thrown and no index is ever created</title>
                <link>https://jira.mongodb.org/browse/SERVER-40990</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;MultiIndexBlock::init has a for-loop for initializing indexes in-memory and on disk. In the for-loop we call IndexCatalog::prepareSpecForCreate to check for errors: bad spec, already exists.&lt;/p&gt;

&lt;p&gt;The first loop is fine, and sets up the index. The second loop will get an IndexAlreadyExists error from IndexCatalog::prepareSpecForCreate. This error will not get swallowed &amp;#8211; we do swallow IndexAlreadyExists errors encountered earlier in the command. The user will get an IndexAlreadyExists error and no index will have been created.&lt;/p&gt;</description>
                <environment></environment>
        <key id="757593">SERVER-40990</key>
            <summary>If a createIndexes request specifies two identical indexes, a IndexAlreadyExists error is thrown and no index is ever created</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="benety.goh@mongodb.com">Benety Goh</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Fri, 3 May 2019 15:10:08 +0000</created>
                <updated>Fri, 9 Aug 2019 15:18:36 +0000</updated>
                            <resolved>Fri, 9 Aug 2019 15:18:36 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2364754" author="benety.goh" created="Fri, 9 Aug 2019 15:18:36 +0000"  >&lt;p&gt;Closing as &quot;Won&apos;t Fix&quot;. The error codes returned from the createIndexes for the scenarios described in the previous comment should be informative enough for the user to identify and correct the invalid set of index specs.&lt;/p&gt;</comment>
                            <comment id="2358105" author="benety.goh" created="Mon, 5 Aug 2019 17:22:49 +0000"  >&lt;p&gt;Current behavior for identical indexes within the same createIndexes command:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;same index name, different key pattern - IndexKeySpecsConflict&lt;/li&gt;
	&lt;li&gt;different index names, same key pattern - IndexOptionsConflict&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Unless the desired outcome is to deduplicate index specs within the same command invocation, we can consider leaving the current behavior intact.&lt;/p&gt;</comment>
                            <comment id="2356369" author="benety.goh" created="Fri, 2 Aug 2019 17:34:10 +0000"  >&lt;p&gt;We current return &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ebfc0dc2e6f80e61d6b94742a79d1194997a7959/src/mongo/db/catalog/index_catalog_impl.cpp#L761&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;IndexOptionsConflict&lt;/a&gt; for the case where two indexes within the same createIndexes command have the same key pattern:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.runCommand({createIndexes: &apos;t&apos;, indexes: [{name: &apos;a_1&apos;, key: {a: 1}}, {name: &apos;a_2&apos;, key: {a: 1}}]})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;ok&quot; : 0,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;errmsg&quot; : &quot;Index with name: a_2 already exists with a different name&quot;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;code&quot; : 85,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;codeName&quot; : &quot;IndexOptionsConflict&quot;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&lt;/td&gt;
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&lt;/div&gt;
&lt;p/&gt; </comment>
                            <comment id="2356340" author="benety.goh" created="Fri, 2 Aug 2019 17:15:09 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42272&quot; title=&quot;IndexBuildsCoordinator crashes on index build with duplicate index names&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42272&quot;&gt;&lt;del&gt;SERVER-42272&lt;/del&gt;&lt;/a&gt; added a test case to create_indexes.js for specifying two indexes with identical names in the same createIndexes command.&lt;/p&gt;</comment>
                            <comment id="2345898" author="milkie" created="Fri, 26 Jul 2019 17:03:31 +0000"  >&lt;p&gt;The Coordinator is running createIndexes on primaries now.&lt;/p&gt;</comment>
                            <comment id="2249157" author="dianna.hohensee" created="Thu, 16 May 2019 17:22:38 +0000"  >&lt;p&gt;This was fixed in v4.2 by adding &lt;a href=&quot;https://github.com/mongodb/mongo/blob/0dd0b000b4c8df0e7d7bee1826c252af60c73410/src/mongo/db/catalog/multi_index_block.cpp#L284-L297&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this code&lt;/a&gt; in &lt;a href=&quot;https://github.com/mongodb/mongo/commit/3dbaffb7768951c185b48aa0bfd5a69dd99d4ec3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this commit&lt;/a&gt;. An OperationFailed error with an informative msg will be returned instead of an IndexAlreadyExists error.&lt;/p&gt;

&lt;p&gt;We may wish to consider some other behavior, like going ahead and building the indexes that do not cause an IndexAlreadyExists error. And adding testing either way.&lt;/p&gt;</comment>
                            <comment id="2233749" author="dianna.hohensee" created="Fri, 3 May 2019 15:26:45 +0000"  >&lt;p&gt;Note: We&apos;ll need to do something for the IndexBuildsCoordinator once it is running createIndexes cmd requests on primaries.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="751546">SERVER-40926</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="751548">SERVER-40927</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="860708">SERVER-42272</issuekey>
        </issuelink>
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