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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-40581] Separate OpDebug and AdditiveMetrics</title>
                <link>https://jira.mongodb.org/browse/SERVER-40581</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The OpDebug member of CurOp prescribes a (completely unenforced) &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2602fb6991469c7573534c2011d6ce3dae075682/src/mongo/db/curop.h#L227-L229&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;contract&lt;/a&gt; that &lt;em&gt;only&lt;/em&gt; the owning thread may read/write it&apos;s data members.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/2602fb6991469c7573534c2011d6ce3dae075682/src/mongo/db/curop.h#L52-L56&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;AdditiveMetrics&lt;/a&gt;, a member of OpDebug, stores counters to operations that can be aggregated across multiple operations within a single multi-statement transaction.&lt;/p&gt;

&lt;p&gt;&lt;em&gt;There is currently no API compatible way to report AdditiveMetrics to the &quot;currentOp&quot; command, because it requires outside threads accessing OpDebug.&lt;/em&gt;&lt;/p&gt;

&lt;p&gt;My suggestion is to either pull AdditiveMetrics out of OpDebug or remove OpDebug entirely. AdditiveMetrics (or even CurOp) would then enforce concurrency control on member variables that may or may not be accessed by outside threads like the currentOp command.&lt;/p&gt;</description>
                <environment></environment>
        <key id="736398">SERVER-40581</key>
            <summary>Separate OpDebug and AdditiveMetrics</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                            <label>currentOp</label>
                            <label>query</label>
                    </labels>
                <created>Thu, 11 Apr 2019 15:28:20 +0000</created>
                <updated>Tue, 6 Dec 2022 03:02:03 +0000</updated>
                            <resolved>Mon, 22 Apr 2019 15:54:00 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2220637" author="craig.homa" created="Mon, 22 Apr 2019 15:54:00 +0000"  >&lt;p&gt;We&apos;re definitely interested in cleaning this up but expect this sort of cleanup to be packaged into future work on diagnostics.&#160;&lt;/p&gt;</comment>
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