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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-35793] Write concurrency test to verify server-wide transactions metrics tracking</title>
                <link>https://jira.mongodb.org/browse/SERVER-35793</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It would be nice to add a basic concurrency test to verify that the various transactions metrics tracked in serverStatus uphold some basic invariants when many transactions are run concurrently. These metrics from the &lt;tt&gt;transactions&lt;/tt&gt; serverStatus section&#160;include:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;currentOpen&lt;/li&gt;
	&lt;li&gt;currentActive&lt;/li&gt;
	&lt;li&gt;currentInactive&lt;/li&gt;
	&lt;li&gt;totalStarted&lt;/li&gt;
	&lt;li&gt;totalCommitted&lt;/li&gt;
	&lt;li&gt;totalAborted&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;One idea would be to run several threads that each execute their own transaction. We could design the test so that we expect a certain number of write conflicts between transactions, for example. At the end of the test we could verify that the total number of expected commits and aborts is correct, as well as the total number of started transactions. We could also verify that after running many transactions and all finish, currentOpen, currentActive, and currentInactive are all zero. It would also be nice to test that&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;currentActive + currentInactive = currentOpen&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;totalCommitted + totalAborted + currentOpen = totalStarted&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;Some of these invariants may not always hold true due to the way we update certain counters non-atomically.&lt;/p&gt;</description>
                <environment></environment>
        <key id="563983">SERVER-35793</key>
            <summary>Write concurrency test to verify server-wide transactions metrics tracking</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="william.schultz@mongodb.com">William Schultz</assignee>
                                    <reporter username="william.schultz@mongodb.com">William Schultz</reporter>
                        <labels>
                            <label>global-txn-metrics</label>
                    </labels>
                <created>Mon, 25 Jun 2018 21:13:56 +0000</created>
                <updated>Sun, 29 Oct 2023 22:30:25 +0000</updated>
                            <resolved>Fri, 24 Aug 2018 21:55:02 +0000</resolved>
                                                    <fixVersion>4.0.3</fixVersion>
                    <fixVersion>4.1.3</fixVersion>
                                    <component>Diagnostics</component>
                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1987616" author="xgen-internal-githook" created="Tue, 28 Aug 2018 15:03:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;William Schultz&apos;, &apos;email&apos;: &apos;william.schultz@mongodb.com&apos;, &apos;username&apos;: &apos;will62794&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35793&quot; title=&quot;Write concurrency test to verify server-wide transactions metrics tracking&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35793&quot;&gt;&lt;del&gt;SERVER-35793&lt;/del&gt;&lt;/a&gt; Add concurrency test for transactions metrics&lt;/p&gt;

&lt;p&gt;(cherry picked from commit f66a67ac3e80f4968506cab34ac35668d65a13e6)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/db4e84885dda79d8b47b4d3688b92410937c619c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/db4e84885dda79d8b47b4d3688b92410937c619c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1985605" author="xgen-internal-githook" created="Fri, 24 Aug 2018 21:54:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;William Schultz&apos;, &apos;email&apos;: &apos;william.schultz@mongodb.com&apos;, &apos;username&apos;: &apos;will62794&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35793&quot; title=&quot;Write concurrency test to verify server-wide transactions metrics tracking&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35793&quot;&gt;&lt;del&gt;SERVER-35793&lt;/del&gt;&lt;/a&gt; Add concurrency test for transactions metrics&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f66a67ac3e80f4968506cab34ac35668d65a13e6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f66a67ac3e80f4968506cab34ac35668d65a13e6&lt;/a&gt;&lt;/p&gt;</comment>
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