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    <title>MongoDB Jira</title>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-5765] query option to start tailing at the end of a capped collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-5765</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="37844">SERVER-5765</key>
            <summary>query option to start tailing at the end of a capped 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="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="eliot">Eliot Horowitz</reporter>
                        <labels>
                    </labels>
                <created>Fri, 4 May 2012 19:17:40 +0000</created>
                <updated>Tue, 6 Dec 2022 05:33:31 +0000</updated>
                                                                            <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="337600" author="glasser" created="Fri, 17 May 2013 01:21:01 +0000"  >&lt;p&gt;This is definitely something we would use at Meteor.&lt;/p&gt;

&lt;p&gt;In general, it would be really nice if there was a &quot;general&quot; way to tail a cursor that survives when the cursor dies, without there having to be a monotonically increasing sorted field like &quot;ts&quot; to use for restarts.&lt;/p&gt;

&lt;p&gt;Ideally, you would be able to do something like:&lt;/p&gt;

&lt;p&gt;  db.events.find({$startTailAt: {_id: ObjectId(&quot;1234&quot;)}).addOption(OPQUERY_TAILABLE);&lt;br/&gt;
and/or&lt;br/&gt;
  db.events.find({$startTailAt: {_id: ObjectId(&quot;1234&quot;)}).addOption(OPQUERY_TAILABLE);&lt;/p&gt;

&lt;p&gt;These would essentially do a findOne on the query given and then start tailing from there.  In addition, you could do something like&lt;br/&gt;
  db.events.find({$startTailAt: {$last: 50}}).addOption(OPQUERY_TAILABLE);&lt;br/&gt;
to start 50 documents from the end of the capped collection, and of course {$last: 0} would work too.&lt;/p&gt;

&lt;p&gt;(I don&apos;t care much about the particular syntax. I just want a way to specify a query that matches a SINGLE document and starts tailing from there rather than a query that needs to match the start document AND everything after it; as well as simple ways to just do &quot;start at the end&quot; or &quot;start a fixed buffer before the end&quot;. The former is good for writing a generic &quot;keep tailable cursor going even if it dies&quot; driver; the latter are good for use cases like &quot;show me the last 100 log entries and then keep tailing&quot;.)&lt;/p&gt;</comment>
                            <comment id="116591" author="eliot" created="Sun, 6 May 2012 04:10:11 +0000"  >&lt;p&gt;Yes, something like that.&lt;br/&gt;
Not sure this gets you all the way to pub/sub, but closer.&lt;/p&gt;</comment>
                            <comment id="116569" author="scotthernandez" created="Sat, 5 May 2012 17:58:10 +0000"  >&lt;p&gt;Something like db.events.find({$tail:true}).addOption(OPQUERY_TAILABLE)?&lt;/p&gt;

&lt;p&gt;Is this the same the requirement as something like a pub/sub api? &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3385&quot; title=&quot;Publish/Subscribe (Message queue) functionality&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3385&quot;&gt;&lt;del&gt;SERVER-3385&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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