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    <title>MongoDB Jira</title>
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    <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-31756] startParallelShell is not compatible with causal consistency test suite</title>
                <link>https://jira.mongodb.org/browse/SERVER-31756</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;startParallelShell currently spawns a new mongo shell instance with the same TestData as the parent shell. However, it does not pass along the clusterTime information to the child process. Therefore, tests that assumes that the spawned process can immediately read something the parent process wrote can fail.&lt;/p&gt;</description>
                <environment></environment>
        <key id="452208">SERVER-31756</key>
            <summary>startParallelShell is not compatible with causal consistency test suite</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="max.hirschhorn@mongodb.com">Max Hirschhorn</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Fri, 27 Oct 2017 21:40:08 +0000</created>
                <updated>Fri, 17 Apr 2020 00:29:20 +0000</updated>
                            <resolved>Fri, 17 Apr 2020 00:28:00 +0000</resolved>
                                    <version>3.6.4</version>
                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3043619" author="max.hirschhorn@10gen.com" created="Fri, 17 Apr 2020 00:28:00 +0000"  >&lt;p&gt;The &lt;tt&gt;removec.js&lt;/tt&gt; failure in the &lt;tt&gt;causally_consistent_jscore_passthrough_auth.yml&lt;/tt&gt; test suite which prompted the creation of this ticket was already addressed by the changes from &lt;a href=&quot;https://github.com/mongodb/mongo/commit/351244db692906d883bd89a664281eaf3069093e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;351244d&lt;/a&gt; as part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40618&quot; title=&quot;Remove removec.js from causally consistent jscore passthrough&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40618&quot;&gt;&lt;del&gt;SERVER-40618&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Rather than banning &lt;tt&gt;startParallelShell()&lt;/tt&gt; in the causal consistency test suites, we could actually make operations in it causally consistent with the parent mongo shell by propagating the operation time and cluster time, as well as replacing the default session for the global &lt;tt&gt;db&lt;/tt&gt; object with one that has &lt;tt&gt;isCausalConsistency() === true&lt;/tt&gt;. This would be similar to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f889e85da61e90586d032e8b706bf9506919f253/jstests/concurrency/fsm_libs/worker_thread.js#L57-L85&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;what we do in &lt;tt&gt;worker_thread.js&lt;/tt&gt;&lt;/a&gt; to make it so the effects of the &lt;tt&gt;$config.setup()&lt;/tt&gt; function are guaranteed to be visible to the FSM worker threads at the time of them running their starting state function. Note that such an effort would be useful to do for &lt;tt&gt;Thread&lt;/tt&gt; in addition to &lt;tt&gt;startParallelShell()&lt;/tt&gt; for a similar reason.&lt;/p&gt;

&lt;p&gt;If this issue continues to come up for other tests in the causal consistency test suites, then we can revisit making such a change.&lt;/p&gt;</comment>
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