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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-48523] Unconditionally check the first entry in the oplog when attempting to resume a change stream</title>
                <link>https://jira.mongodb.org/browse/SERVER-48523</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ae39837dc5bd5963172bd65ec0227c29cfd29042/src/mongo/db/pipeline/document_source_check_resume_token.cpp#L290-L318&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;determining whether a node&apos;s oplog has sufficient history to correctly resume a stream&lt;/a&gt;, we first try to retrieve the initial result from the resumed stream. This is because the result may be enough for us to determine that the stream is resumable, without doing any additional work. If the result does not conclusively prove that the stream is resumable, either because it is EOF or chronologically after the resume point, then we must perform a separate, internal query on the oplog via &lt;tt&gt;_assertOplogHasEnoughHistory&lt;/tt&gt; to determine whether its first entry is earlier than the resume point.&lt;/p&gt;

&lt;p&gt;However, if there are &lt;b&gt;no matching entries&lt;/b&gt; in the oplog and we supply a resume point that has already fallen off, our attempt to retrieve the first entry will scan through the entire oplog until it reaches EOF, only to then call &lt;tt&gt;_assertOplogHasEnoughHistory&lt;/tt&gt; and throw an exception. If the oplog is large, then this pointless scan can be quite disruptive. We should instead unconditionally call &lt;tt&gt;_assertOplogHasEnoughHistory&lt;/tt&gt; to check the oplog&apos;s history before attempting to pull the first result from the stream.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1368228">SERVER-48523</key>
            <summary>Unconditionally check the first entry in the oplog when attempting to resume a change stream</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="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="13201">Fixed</resolution>
                                        <assignee username="bernard.gorman@mongodb.com">Bernard Gorman</assignee>
                                    <reporter username="bernard.gorman@mongodb.com">Bernard Gorman</reporter>
                        <labels>
                            <label>qexec-team</label>
                    </labels>
                <created>Mon, 1 Jun 2020 19:16:59 +0000</created>
                <updated>Sun, 29 Oct 2023 22:07:34 +0000</updated>
                            <resolved>Thu, 27 Aug 2020 13:27:34 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                    <fixVersion>4.4.2</fixVersion>
                    <fixVersion>4.2.11</fixVersion>
                    <fixVersion>4.0.22</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="3457686" author="xgen-internal-githook" created="Wed, 21 Oct 2020 23:28:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Bernard Gorman&apos;, &apos;email&apos;: &apos;bernard.gorman@gmail.com&apos;, &apos;username&apos;: &apos;gormanb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48523&quot; title=&quot;Unconditionally check the first entry in the oplog when attempting to resume a change stream&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48523&quot;&gt;&lt;del&gt;SERVER-48523&lt;/del&gt;&lt;/a&gt; Unconditionally check the first entry in the oplog when attempting to resume a change stream&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 694ed4153b9d5424b5d169fea5c68f99d4dfb45a)&lt;br/&gt;
(cherry picked from commit 9e38cbba7d3efefa59e25cb0411558591036d30b)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f58bdb68407abc68fddc8a91c0d58785423db1b5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f58bdb68407abc68fddc8a91c0d58785423db1b5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3438533" author="xgen-internal-githook" created="Sun, 11 Oct 2020 20:24:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Bernard Gorman&apos;, &apos;email&apos;: &apos;bernard.gorman@gmail.com&apos;, &apos;username&apos;: &apos;gormanb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48523&quot; title=&quot;Unconditionally check the first entry in the oplog when attempting to resume a change stream&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48523&quot;&gt;&lt;del&gt;SERVER-48523&lt;/del&gt;&lt;/a&gt; Unconditionally check the first entry in the oplog when attempting to resume a change stream&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 694ed4153b9d5424b5d169fea5c68f99d4dfb45a)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9e38cbba7d3efefa59e25cb0411558591036d30b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9e38cbba7d3efefa59e25cb0411558591036d30b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3390567" author="xgen-internal-githook" created="Fri, 11 Sep 2020 22:35:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Bernard Gorman&apos;, &apos;email&apos;: &apos;bernard.gorman@gmail.com&apos;, &apos;username&apos;: &apos;gormanb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48523&quot; title=&quot;Unconditionally check the first entry in the oplog when attempting to resume a change stream&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48523&quot;&gt;&lt;del&gt;SERVER-48523&lt;/del&gt;&lt;/a&gt; Unconditionally check the first entry in the oplog when attempting to resume a change stream&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 694ed4153b9d5424b5d169fea5c68f99d4dfb45a)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/87a8196c3319c5ce4c361d5d5196b387fa5410ae&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/87a8196c3319c5ce4c361d5d5196b387fa5410ae&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3361917" author="xgen-internal-githook" created="Thu, 27 Aug 2020 13:09:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Bernard Gorman&apos;, &apos;email&apos;: &apos;bernard.gorman@gmail.com&apos;, &apos;username&apos;: &apos;gormanb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48523&quot; title=&quot;Unconditionally check the first entry in the oplog when attempting to resume a change stream&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48523&quot;&gt;&lt;del&gt;SERVER-48523&lt;/del&gt;&lt;/a&gt; Unconditionally check the first entry in the oplog when attempting to resume a change stream&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/694ed4153b9d5424b5d169fea5c68f99d4dfb45a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/694ed4153b9d5424b5d169fea5c68f99d4dfb45a&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="1413466">SERVER-49691</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1421055">SERVER-49896</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1454387">SERVER-50580</issuekey>
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            <issuekey id="1473017">SERVER-50903</issuekey>
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