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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-85391] Do oplog version check in OplogFetcher instead of OplogBatcher</title>
                <link>https://jira.mongodb.org/browse/SERVER-85391</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Move &lt;a href=&quot;https://github.com/10gen/mongo/blob/a726af5/src/mongo/db/repl/oplog_batcher.cpp#L158-L170&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;oplog version check logic&lt;/a&gt; from OplogBatcher to OplogFetcher during &lt;a href=&quot;https://github.com/10gen/mongo/blob/a726af5/src/mongo/db/repl/oplog_fetcher.cpp#L159&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;document validation&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;We should probably feature flag gate this since doing in OplogFetcher would need to parse the version from the oplog BSONObject which cause some overhead, while in OplogBatcher the entire oplog entry is already parsed so getting the version is trivial.&lt;/p&gt;

&lt;p&gt;Since we will have an OplogWriter in front of OplogApplier, we should do the version check early - that is, before we write to the oplog - but we want the OplogWriter to be efficient (i.e. we don&#8217;t want to iterate through the oplog entries in the batch and parse the version). Therefore, we can check the version in the OplogFetcher where we already iterate and parse the OpTime field for validation.&lt;/p&gt;

&lt;p&gt;AC: The OplogFetcher validates the version, and neither the OplogWriter nor the OplogApplier check the version.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2550254">SERVER-85391</key>
            <summary>Do oplog version check in OplogFetcher instead of OplogBatcher</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="brad.cater@mongodb.com">Brad Cater</assignee>
                                    <reporter username="wenbin.zhu@mongodb.com">Wenbin Zhu</reporter>
                        <labels>
                            <label>PM-3489-Milestone-OplogWriter-CP</label>
                    </labels>
                <created>Thu, 18 Jan 2024 17:20:05 +0000</created>
                <updated>Fri, 2 Feb 2024 23:21:20 +0000</updated>
                            <resolved>Fri, 2 Feb 2024 22:14:57 +0000</resolved>
                                                    <fixVersion>8.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="6063847" author="xgen-internal-githook" created="Fri, 2 Feb 2024 20:43:25 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Brad Cater&apos;, &apos;email&apos;: &apos;152920274+brad-cater-mongodb@users.noreply.github.com&apos;, &apos;username&apos;: &apos;brad-cater-mongodb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-85391&quot; title=&quot;Do oplog version check in OplogFetcher instead of OplogBatcher&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-85391&quot;&gt;&lt;del&gt;SERVER-85391&lt;/del&gt;&lt;/a&gt; Check the oplog version in the OplogFetcher instead of in the OplogBatcher. (#18502)&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 880fe14342bea7a7ec4a6c86d0cd4b96491b5de8&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f3366610bdad5c036730b425b8a912d570dea4d7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f3366610bdad5c036730b425b8a912d570dea4d7&lt;/a&gt;&lt;/p&gt;</comment>
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