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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-31456] Concurrency framework doesn&apos;t enforce causal relationship between main thread and worker threads</title>
                <link>https://jira.mongodb.org/browse/SERVER-31456</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The functions defined with the &lt;tt&gt;$config&lt;/tt&gt; object of an FSM workload are executed by multiple threads in the following way:&lt;/p&gt;

&lt;p&gt;1. The &lt;tt&gt;$config.setup()&lt;/tt&gt; function is executed once by the main thread.&lt;br/&gt;
2. The &lt;tt&gt;$config.states&lt;/tt&gt; functions are executed &lt;tt&gt;$config.iterations&lt;/tt&gt; times by each the worker threads.&lt;br/&gt;
3. The &lt;tt&gt;$config.teardown()&lt;/tt&gt; function is executed by the main thread.&lt;/p&gt;

&lt;p&gt;The changes from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30681&quot; title=&quot;Run the concurrency suite with causal consistency enabled&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30681&quot;&gt;&lt;del&gt;SERVER-30681&lt;/del&gt;&lt;/a&gt; made it so a session is started with causal consistency enabled for each of the FSM worker threads. The changes from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30682&quot; title=&quot;Run the concurrency suite with &amp;quot;secondary&amp;quot; read preference&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30682&quot;&gt;&lt;del&gt;SERVER-30682&lt;/del&gt;&lt;/a&gt; made it so that a readPreference of &quot;secondary&quot; is used, which made it possible for the &lt;tt&gt;$config.setup()&lt;/tt&gt; function to do a write to the primary and for a &lt;tt&gt;$config.states&lt;/tt&gt; function to do a read from a secondary. The main thread must forward its operationTime and clusterTime after #1 to each of the worker threads to ensure that a read from secondary will wait until the write has been applied.&lt;/p&gt;</description>
                <environment></environment>
        <key id="442094">SERVER-31456</key>
            <summary>Concurrency framework doesn&apos;t enforce causal relationship between main thread and worker threads</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="max.hirschhorn@mongodb.com">Max Hirschhorn</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                            <label>sharding36-passthrough-testing</label>
                    </labels>
                <created>Sat, 7 Oct 2017 19:14:29 +0000</created>
                <updated>Mon, 30 Oct 2023 23:12:59 +0000</updated>
                            <resolved>Sun, 15 Oct 2017 01:58:10 +0000</resolved>
                                                    <fixVersion>3.6.0-rc1</fixVersion>
                                    <component>Sharding</component>
                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1699114" author="xgen-internal-githook" created="Sun, 15 Oct 2017 01:56:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;max.hirschhorn@mongodb.com&apos;, &apos;name&apos;: &apos;Max Hirschhorn&apos;, &apos;username&apos;: &apos;visemet&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31456&quot; title=&quot;Concurrency framework doesn&amp;#39;t enforce causal relationship between main thread and worker threads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31456&quot;&gt;&lt;del&gt;SERVER-31456&lt;/del&gt;&lt;/a&gt; Set initial&lt;/p&gt;
{Cluster,Operation}
&lt;p&gt;Time in concurrency suite.&lt;/p&gt;

&lt;p&gt;Ensures that the FSM worker threads are guaranteed to observe the&lt;br/&gt;
effects of the $config.setup() function being called since they&apos;ll&lt;br/&gt;
specify an afterClusterTime beyond that point.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0ed1b71a50b45b93f0952e1482643c0d9216731d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0ed1b71a50b45b93f0952e1482643c0d9216731d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1699113" author="xgen-internal-githook" created="Sun, 15 Oct 2017 01:56:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;max.hirschhorn@mongodb.com&apos;, &apos;name&apos;: &apos;Max Hirschhorn&apos;, &apos;username&apos;: &apos;visemet&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31456&quot; title=&quot;Concurrency framework doesn&amp;#39;t enforce causal relationship between main thread and worker threads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31456&quot;&gt;&lt;del&gt;SERVER-31456&lt;/del&gt;&lt;/a&gt; Expose server type on Mongo connection object.&lt;/p&gt;

&lt;p&gt;This makes it possible to prevent the  mongo shell from gossiping a&lt;br/&gt;
clusterTime to stand-alone mongod processes when the mongo shell is also&lt;br/&gt;
connected to a replica set or a sharded cluster.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2c5511c8c411c70ac1063d1209764e71f83d0b1a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2c5511c8c411c70ac1063d1209764e71f83d0b1a&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="442937">SERVER-31481</issuekey>
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            <issuekey id="416988">SERVER-30681</issuekey>
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