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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-18081] Tailing the oplog requires paging in the recently added entries under WiredTiger</title>
                <link>https://jira.mongodb.org/browse/SERVER-18081</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;While debugging a large performance drop related to the oplog filling (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18079&quot; title=&quot;Large performance drop with documents &amp;gt; 16k on Windows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-18079&quot;&gt;&lt;del&gt;SERVER-18079&lt;/del&gt;&lt;/a&gt; for details) I noticed that the issue was exacerbated by the fact that the thread tailing the oplog is having to page in the recently added entries at the end of the oplog (see &lt;a href=&quot;https://jira.mongodb.org/secure/attachment/71073/stacks-oplog-tail.png&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;these stack traces&lt;/a&gt; from that ticket).&lt;/p&gt;

&lt;p&gt;Independent of the memory allocator issues on that ticket, it seems that having to page in the recently added oplog entries is not optimal for performance. Is there any way to avoid this?&lt;/p&gt;</description>
                <environment></environment>
        <key id="198326">SERVER-18081</key>
            <summary>Tailing the oplog requires paging in the recently added entries under WiredTiger</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                            <label>WTcc</label>
                    </labels>
                <created>Thu, 16 Apr 2015 15:43:40 +0000</created>
                <updated>Tue, 6 Dec 2022 04:52:57 +0000</updated>
                            <resolved>Wed, 21 Dec 2016 23:36:09 +0000</resolved>
                                    <version>3.0.1</version>
                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="934141" author="dan@10gen.com" created="Mon, 8 Jun 2015 17:12:11 +0000"  >&lt;p&gt;The actual impact needs to be quantified, but this may be important for primary performance.  Most likely to happen when tailing the oplog falls slightly behind, ie, &amp;gt; 10M behind when splits/evictions kick in.  Need to pay attention to cache misses on the oplog collection.  Keep in mind that truncation at the beginning of the oplog may also cause cache misses.  &lt;/p&gt;</comment>
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            <issuekey id="278525">SERVER-23622</issuekey>
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            <issuekey id="331115">SERVER-26988</issuekey>
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            <issuekey id="288044">WT-2647</issuekey>
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