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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-9025] [suggestion] Expression for &quot;_id&quot; generation.</title>
                <link>https://jira.mongodb.org/browse/SERVER-9025</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Mongo has a interop mechanism between replica members that lets it generate unique _id easily. But when our application wants to create an _id that starts with user_id, it becomes much harder to keep uniqueness.&lt;/p&gt;

&lt;p&gt;I&apos;d like to suggest to add a mechanism to be able to set an _id generation for collection as some sort of template that would look like (in my case with user_id upfront) &quot;&lt;/p&gt;
{id}
{mongoid}
&lt;p&gt;&quot;, that would put my id (which is just user_id) and then mongo-generated one. Possibly more parameters could be added to make it more flexible.&lt;/p&gt;

&lt;p&gt;What do you think?&lt;/p&gt;</description>
                <environment></environment>
        <key id="69031">SERVER-9025</key>
            <summary>[suggestion] Expression for &quot;_id&quot; generation.</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="-1">Unassigned</assignee>
                                    <reporter username="k-bx">Kostyantyn Rybnikov</reporter>
                        <labels>
                    </labels>
                <created>Tue, 19 Mar 2013 22:16:53 +0000</created>
                <updated>Wed, 10 Dec 2014 23:10:46 +0000</updated>
                            <resolved>Wed, 20 Mar 2013 01:48:01 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="293490" author="k-bx" created="Tue, 19 Mar 2013 23:13:33 +0000"  >&lt;p&gt;Sorry, I can see that drivers are generating machine_id themselves&lt;/p&gt;

&lt;p&gt;    machine_hash = _md5func()&lt;br/&gt;
    machine_hash.update(socket.gethostname())&lt;br/&gt;
    return machine_hash.digest()&lt;span class=&quot;error&quot;&gt;&amp;#91;0:3&amp;#93;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;which I didn&apos;t know (I don&apos;t know why, but I always thought that _id&apos;s are generated on server-side and guarantee uniqueness via guaranteed uniqueness of machine-id somehow).&lt;/p&gt;

&lt;p&gt;So I guess you can close this bug since _id&apos;s with this level of guarantees are also easy to generate on client-side.&lt;/p&gt;</comment>
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