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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>[DOCS-13395] Investigate changes in SERVER-43069: Ops that are slow to apply don&apos;t condition on slowOpSampleRate</title>
                <link>https://jira.mongodb.org/browse/DOCS-13395</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    Conditioned logging for slow operations on the sample rate.&lt;/p&gt;

&lt;p&gt;Existing behavior prior to this ticket: &lt;a href=&quot;https://docs.mongodb.com/manual/release-notes/4.2/#slow-oplog&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/release-notes/4.2/#slow-oplog&lt;/a&gt;&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    Here&apos;s the code in question: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.6.14/src/mongo/db/repl/sync_tail.cpp#L335-L351&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.6.14/src/mongo/db/repl/sync_tail.cpp#L335-L351&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;That should be doing something similar to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.6.14/src/mongo/db/ops/write_ops_exec.cpp#L122-L124&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.6.14/src/mongo/db/ops/write_ops_exec.cpp#L122-L124&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This behaviour is called out in &lt;a href=&quot;https://docs.mongodb.com/manual/release-notes/4.2/#slow-oplog&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/release-notes/4.2/#slow-oplog&lt;/a&gt;, though I don&apos;t see any discussion on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32146&quot; title=&quot;Log slow oplog entry application&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32146&quot;&gt;&lt;del&gt;SERVER-32146&lt;/del&gt;&lt;/a&gt; or &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12178&quot; title=&quot;Docs for SERVER-32146: Log slow oplog entry application&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12178&quot;&gt;&lt;del&gt;DOCS-12178&lt;/del&gt;&lt;/a&gt; for whether sampling was considered.&lt;/p&gt;

&lt;p&gt;There&apos;s also a couple other places where this might need to be checked:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.6.14/src/mongo/db/commands/eval.cpp#L131&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.6.14/src/mongo/db/commands/eval.cpp#L131&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.6.14/src/mongo/db/s/split_vector.cpp#L263&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.6.14/src/mongo/db/s/split_vector.cpp#L263&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;It&apos;s possible a better fix would be to decouple &lt;tt&gt;slowOpSampleRate&lt;/tt&gt; and &lt;tt&gt;slowms&lt;/tt&gt;, such that you log all slow operations but then subject non-slow ops to sampling.&lt;/p&gt;


&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="1135098">DOCS-13395</key>
            <summary>Investigate changes in SERVER-43069: Ops that are slow to apply don&apos;t condition on slowOpSampleRate</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="jeffrey.allen@mongodb.com">Jeffrey Allen</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                            <label>docs-administration</label>
                            <label>docs-query</label>
                    </labels>
                <created>Thu, 6 Feb 2020 14:52:17 +0000</created>
                <updated>Mon, 13 Nov 2023 18:10:50 +0000</updated>
                            <resolved>Tue, 9 Nov 2021 22:48:12 +0000</resolved>
                                                    <fixVersion>4.3.4</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4179163" author="xgen-internal-githook" created="Tue, 9 Nov 2021 22:47:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jeff Allen&apos;, &apos;email&apos;: &apos;jeffrey.allen@10gen.com&apos;, &apos;username&apos;: &apos;jeff-allen-mongo&apos;}
&lt;p&gt;Message: (&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13395&quot; title=&quot;Investigate changes in SERVER-43069: Ops that are slow to apply don&amp;#39;t condition on slowOpSampleRate&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13395&quot;&gt;&lt;del&gt;DOCS-13395&lt;/del&gt;&lt;/a&gt;): slowOpSampleRate affects secondary logs&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/f8d24f56a7b95b03611f2f18d421ae9025bc2989&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/f8d24f56a7b95b03611f2f18d421ae9025bc2989&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4179158" author="xgen-internal-githook" created="Tue, 9 Nov 2021 22:46:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jeff Allen&apos;, &apos;email&apos;: &apos;jeffrey.allen@10gen.com&apos;, &apos;username&apos;: &apos;jeff-allen-mongo&apos;}
&lt;p&gt;Message: (&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13395&quot; title=&quot;Investigate changes in SERVER-43069: Ops that are slow to apply don&amp;#39;t condition on slowOpSampleRate&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13395&quot;&gt;&lt;del&gt;DOCS-13395&lt;/del&gt;&lt;/a&gt;): slowOpSampleRate affects secondary logs&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/ba95e8e3d820a8b70d4df87f43d9857740d12f44&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/ba95e8e3d820a8b70d4df87f43d9857740d12f44&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4179154" author="xgen-internal-githook" created="Tue, 9 Nov 2021 22:46:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jeff Allen&apos;, &apos;email&apos;: &apos;jeffrey.allen@10gen.com&apos;, &apos;username&apos;: &apos;jeff-allen-mongo&apos;}
&lt;p&gt;Message: (&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13395&quot; title=&quot;Investigate changes in SERVER-43069: Ops that are slow to apply don&amp;#39;t condition on slowOpSampleRate&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13395&quot;&gt;&lt;del&gt;DOCS-13395&lt;/del&gt;&lt;/a&gt;): slowOpSampleRate affects secondary logs&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/459754f697e2ab863e862cb7e857b970ab05f1ca&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/459754f697e2ab863e862cb7e857b970ab05f1ca&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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