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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-26887] Idempotency of createCollection with options</title>
                <link>https://jira.mongodb.org/browse/SERVER-26887</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In oplog application, we ignore the NamespaceExists error returned by createCollection if the collection with the same name but different options already exists.&lt;/p&gt;

&lt;p&gt;Most options of &lt;a href=&quot;https://docs.mongodb.com/v3.2/reference/method/db.createCollection/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;createCollection&lt;/a&gt; don&apos;t affect the semantic of operations on secondaries, like the following (capped collection related are omitted here):&lt;br/&gt;
1. usePowerOf2Sizes&lt;br/&gt;
2. noPadding&lt;br/&gt;
3. storageEngine&lt;br/&gt;
4. validation related&lt;br/&gt;
5. indexOptionDefaults&lt;/p&gt;

&lt;p&gt;However, in 3.4, we added two options that affect the behavior of operations on secondaries.&lt;br/&gt;
1. collation in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23849&quot; title=&quot;Add collection default collation to the collection catalog entry&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23849&quot;&gt;&lt;del&gt;SERVER-23849&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
2. idIndex in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26514&quot; title=&quot;Create command should take idIndex option&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26514&quot;&gt;&lt;del&gt;SERVER-26514&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&lt;b&gt;collation option&lt;/b&gt;&lt;br/&gt;
The first one can cause the reapplication of insert lead to different data than the first application because a case-insensitive _id index is created later. &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;
		&lt;tbody &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;  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;createCollection with no collation&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;insert { _id: &quot;foo&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;insert { _id: &quot;FOO&quot;, x: 1 }&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;update { _id: &quot;foo&quot; }, { $set: { x: 2 } }&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;dropCollection&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;   margin-bottom: 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;createCollection with case-insensitive _id index&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;Reapplication of the previous sequence of operations will overwrite the document { id: &quot;foo&quot; }.&lt;/p&gt;

&lt;p&gt;In the other case, if the _id index changes from case-insensitive to case-sensitive, an expected document will be considered missing. However, the missing or duplicated document in this inconsistent period is fine because the collection must be dropped later.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;idIndex option&lt;/b&gt;&lt;br/&gt;
The second option about &lt;tt&gt;idIndex&lt;/tt&gt; is to set the correct &lt;tt&gt;featureCompatibilityVersion&lt;/tt&gt;. The insertion of decimal will return an error.&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;
		&lt;tbody &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;  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;createCollection with v: 2, meaning featureCompatibilityVersion: 3.4&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;insert decimal&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;dropCollection&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;   margin-bottom: 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;createCollection with v:1, meaning featureCompatibilityVersion: 3.2&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The reapplication of these sequence will crash the server because of inserting decimal into 3.2 index.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;viewOn and pipeline&lt;/b&gt;&lt;br/&gt;
If the expected collection doesn&apos;t exist because we&apos;re in an inconsistent state, the application will fail.&lt;/p&gt;

&lt;p&gt;The collection life cycle project will fix all these issues. Another solution is to drop the existing collection if createCollection sees an existing one with the same name.&lt;/p&gt;</description>
                <environment></environment>
        <key id="328928">SERVER-26887</key>
            <summary>Idempotency of createCollection with options</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="9">Done</resolution>
                                        <assignee username="siyuan.zhou@mongodb.com">Siyuan Zhou</assignee>
                                    <reporter username="siyuan.zhou@mongodb.com">Siyuan Zhou</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Nov 2016 21:43:29 +0000</created>
                <updated>Wed, 25 Jan 2017 21:57:44 +0000</updated>
                            <resolved>Fri, 11 Nov 2016 23:02:16 +0000</resolved>
                                    <version>3.4.0-rc2</version>
                                    <fixVersion>3.4.0-rc4</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1432516" author="xgen-internal-githook" created="Fri, 11 Nov 2016 23:01:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;visualzhou&apos;, u&apos;name&apos;: u&apos;Siyuan Zhou&apos;, u&apos;email&apos;: u&apos;siyuan.zhou@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26887&quot; title=&quot;Idempotency of createCollection with options&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26887&quot;&gt;&lt;del&gt;SERVER-26887&lt;/del&gt;&lt;/a&gt; Idempotency of createCollection with options&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3592a98bd198bd7f5a657e7bf5b9c34451c3de6b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3592a98bd198bd7f5a657e7bf5b9c34451c3de6b&lt;/a&gt;&lt;/p&gt;</comment>
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