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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-72523] Consider having mongod autogenerate _id fields for documents inserted into a time-series collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-72523</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If a user inserts a document into MongoDB without an &lt;tt&gt;_id&lt;/tt&gt; field, ordinarily either the client or mongod will automatically generate and add an &lt;tt&gt;_id&lt;/tt&gt; field. &lt;/p&gt;

&lt;p&gt;mongod does not do this for documents inserted to time series collections. This makes sense since the documents aren&apos;t stored directly in a collection, but rather in the buckets collection, which has its own autogenerated &lt;tt&gt;_id&lt;/tt&gt; fields. &lt;/p&gt;

&lt;p&gt;However, if a user expects that inserting a document like {&lt;tt&gt;a: 1, b: 1&lt;/tt&gt;} will autogenerate an &lt;tt&gt;_id&lt;/tt&gt; field and insert a document like {&lt;tt&gt;_id: ObjectId(...), a: 1, b: 1&lt;/tt&gt;}, they may be surprised when this doesn&apos;t happen for time series collections. &lt;/p&gt;

&lt;p&gt;We should discuss whether or not it&apos;s worth having mongod autogenerate &lt;tt&gt;_id&lt;/tt&gt; fields for documents inserted into a time-series collection, and if so, we should maybe also file tickets for drivers which don&apos;t implement &lt;tt&gt;_id&lt;/tt&gt; autogeneration.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2224150">SERVER-72523</key>
            <summary>Consider having mongod autogenerate _id fields for documents inserted into a time-series collection</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="matthew.saltz@mongodb.com">Matthew Saltz</reporter>
                        <labels>
                    </labels>
                <created>Wed, 4 Jan 2023 21:22:32 +0000</created>
                <updated>Tue, 10 Jan 2023 16:53:08 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="5102763" author="gregory.noma" created="Tue, 10 Jan 2023 14:48:50 +0000"  >&lt;p&gt;Potentially one concern here is that this could reinforce users relying on &lt;tt&gt;_id&lt;/tt&gt; as a unique identifier even though there is no uniqueness enforcement on time-series collections.&lt;/p&gt;</comment>
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