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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-32496] Start tailing from the beginning of changes history</title>
                <link>https://jira.mongodb.org/browse/SERVER-32496</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As far as I understand currently, change streams allows to tail either from &lt;tt&gt;resumeAfter&lt;/tt&gt; token or from the tail of the stream. &lt;/p&gt;

&lt;p&gt;For many uses that&apos;s not enough, we may want to resume from the beginning if a client is not in possession of a resume token.&lt;/p&gt;

&lt;p&gt;Something like {{&lt;/p&gt;
{resumeAfter: &apos;oldest&apos;}
&lt;p&gt;}} for the &lt;tt&gt;$changeStream&lt;/tt&gt; would be great. Although the post-update lookup would lack proper semantic for old events, streaming ETL with aggregation in external pipelines would definitely benefit from that.&lt;/p&gt;

&lt;p&gt;It&apos;s also possible to return always the currently available version of the document in the lookup field.&lt;/p&gt;

&lt;p&gt;I believe it would simplify the initial ingestion of events without resorting to other means (like starting the &lt;tt&gt;$changeStream&lt;/tt&gt; the first time and touching all the documents).&lt;/p&gt;

&lt;p&gt;In case the &lt;tt&gt;$changeStream&lt;/tt&gt; is relying on &lt;tt&gt;oplog.rs&lt;/tt&gt; then ideally the same kind of option should be applied as a fallback for a token referring to an operation that has been truncated from the &lt;tt&gt;oplog&lt;/tt&gt; (restart from the first operation found or from the tail?).&lt;/p&gt;

&lt;p&gt;Such a feature is quite important to build a reliable ETL that ensures at-least-once semantic.&lt;/p&gt;</description>
                <environment></environment>
        <key id="477392">SERVER-32496</key>
            <summary>Start tailing from the beginning of changes history</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="mcasimirri">Maurizio Casimirri</reporter>
                        <labels>
                            <label>change-streams-improvements</label>
                    </labels>
                <created>Sun, 31 Dec 2017 18:32:47 +0000</created>
                <updated>Fri, 10 Mar 2023 16:19:29 +0000</updated>
                                            <version>3.6.0</version>
                    <version>3.6.1</version>
                                                    <component>Aggregation Framework</component>
                                        <votes>8</votes>
                                    <watches>29</watches>
                                                                                                                <comments>
                            <comment id="2607919" author="asya" created="Fri, 13 Dec 2019 21:09:37 +0000"  >&lt;p&gt;&amp;gt;&#160;Such a feature is quite important to build a reliable ETL that ensures at-least-once semantic.&lt;/p&gt;

&lt;p&gt;Note that this feature would only be able to guarantee at most once - without a token, there is no way to know how many events were missed before the beginning of the oplog.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="1782790" author="rawkode" created="Tue, 23 Jan 2018 21:27:59 +0000"  >&lt;p&gt;I&apos;m building a Kafka Connect source plugin that supports mongoDB and this issue is one I am currently trying to solve.&lt;/p&gt;

&lt;p&gt;The ability to ask for the earliest document in the oplog would be perfect. Or better yet, the ability to pass a filter and start from the oldest matching record would be better.&lt;/p&gt;</comment>
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