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    <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-82596] Improve StorageInterfaceImpl::findOplogEntryLessThanOrEqualToTimestamp performance</title>
                <link>https://jira.mongodb.org/browse/SERVER-82596</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Going directly to the storage engine is cheaper then going through the query engine. It avoids the overhead of allocating/deallocating the QE stages and walking the associated extra code. &lt;/p&gt;

&lt;p&gt;StorageInterfaceImpl::findOplogEntryLessThanOrEqualToTimestamp is called as part of writing replication changes. Changing it to use the storage engine api will reduce the instruction count&lt;/p&gt;

&lt;p&gt;Note: I have not measured the perf of this change alone&lt;/p&gt;

&lt;p&gt;POC: &lt;a href=&quot;https://github.com/10gen/mongo/commit/479f20a028b9986700f317887ee22e6fe4451745&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/commit/479f20a028b9986700f317887ee22e6fe4451745&lt;/a&gt;&lt;br/&gt;
POC 2: &lt;a href=&quot;https://github.com/10gen/mongo/commit/eeffe115d7f2d1f531ce20af117f74c089f41735#diff-a98bf09e99955852a714c74a1e40bcedf2eda3830222e45dfa7045578c4206d4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/commit/eeffe115d7f2d1f531ce20af117f74c089f41735#diff-a98bf09e99955852a714c74a1e40bcedf2eda3830222e45dfa7045578c4206d4&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2485902">SERVER-82596</key>
            <summary>Improve StorageInterfaceImpl::findOplogEntryLessThanOrEqualToTimestamp performance</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="10033" iconUrl="https://jira.mongodb.org/images/icons/statuses/information.png" description="Status for tickets that need to be escalated and unblocked on our team.">Blocked</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="pavithra.vetriselvan@mongodb.com">Pavithra Vetriselvan</assignee>
                                    <reporter username="mark.benvenuto@mongodb.com">Mark Benvenuto</reporter>
                        <labels>
                            <label>perf-8.0</label>
                            <label>perf-tiger</label>
                            <label>perf-tiger-handoff</label>
                            <label>perf-tiger-poc</label>
                            <label>perf-tiger-q4</label>
                            <label>repl-shortlist</label>
                    </labels>
                <created>Mon, 30 Oct 2023 19:41:11 +0000</created>
                <updated>Mon, 5 Feb 2024 17:16:10 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="5858399" author="matthew.russotto" created="Mon, 6 Nov 2023 19:21:33 +0000"  >&lt;p&gt;Note that seekNear on the oplog when the RU has a read timestamp is affected by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82099&quot; title=&quot;WiredTigerRecordStore searchNear fails on backwards searches with oplog read timestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82099&quot;&gt;&lt;del&gt;SERVER-82099&lt;/del&gt;&lt;/a&gt;; we will need to work around or protect from that scenario if it is not fixed before this is done.&lt;/p&gt;</comment>
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