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    <title>MongoDB Jira</title>
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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-85172] Change stream tests make invalid assumptions about thread scheduling on the server</title>
                <link>https://jira.mongodb.org/browse/SERVER-85172</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Change stream tests make invalid assumptions about thread scheduling on the server, or, more precisely, about valid responses to getMore command on cursors on change stream cursors.&lt;br/&gt;
Actually, it is valid for the server to return zero results on a change stream cursor even if there are change events available at the moment. It can happen in case when the reading thread on the server does not get enough time allocated and the timeout on the change stream cursor (command &quot;getMore&quot;) expires (1 second by default).&lt;br/&gt;
The test and the location that failed: &lt;a href=&quot;https://github.com/10gen/mongo/blob/acdc463fe60bdc85aeced25297041b4051a0fc33/jstests/noPassthrough/report_post_batch_resume_token_mongod.js#L36&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/blob/acdc463fe60bdc85aeced25297041b4051a0fc33/jstests/noPassthrough/report_post_batch_resume_token_mongod.js#L36&lt;/a&gt;.&lt;br/&gt;
Likely, one of the places where that assumption is made is at &lt;a href=&quot;https://github.com/10gen/mongo/blob/acdc463fe60bdc85aeced25297041b4051a0fc33/src/mongo/shell/query.js#L845-L851&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/blob/acdc463fe60bdc85aeced25297041b4051a0fc33/src/mongo/shell/query.js#L845-L851&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2544615">SERVER-85172</key>
            <summary>Change stream tests make invalid assumptions about thread scheduling on the server</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="mindaugas.malinauskas@mongodb.com">Mindaugas Malinauskas</assignee>
                                    <reporter username="mindaugas.malinauskas@mongodb.com">Mindaugas Malinauskas</reporter>
                        <labels>
                    </labels>
                <created>Fri, 12 Jan 2024 17:35:39 +0000</created>
                <updated>Thu, 1 Feb 2024 12:47:04 +0000</updated>
                                            <version>7.3.0-rc0</version>
                    <version>6.0.13</version>
                    <version>5.0.24</version>
                    <version>4.4.28</version>
                    <version>7.0.6</version>
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                            <customfieldvalue>&lt;p&gt;Add a pause of 1 second before &lt;a href=&quot;https://github.com/10gen/mongo/blob/acdc463fe60bdc85aeced25297041b4051a0fc33/src/mongo/db/query/plan_executor_impl.cpp#L579&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/blob/acdc463fe60bdc85aeced25297041b4051a0fc33/src/mongo/db/query/plan_executor_impl.cpp#L579&lt;/a&gt; and execute jstests/noPassthrough/report_post_batch_resume_token_mongod.js in no_passthrough suite.&lt;br/&gt;
Also please see: &lt;a href=&quot;https://jira.mongodb.org/browse/BF-30776&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/BF-30776&lt;/a&gt;. &lt;/p&gt;</customfieldvalue>

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