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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DRIVERS-2828] Update prose tests for mongos deprioritization during retryable ops</title>
                <link>https://jira.mongodb.org/browse/DRIVERS-2828</link>
                <project id="10980" key="DRIVERS">Drivers</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #fafbfc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #fafbfc;&quot;&gt;
&lt;h3&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;&lt;b&gt;Summary&lt;/b&gt;&lt;/h3&gt;

&lt;p&gt;Prose tests introduced by &lt;a href=&quot;https://jira.mongodb.org/browse/DRIVERS-1571&quot; title=&quot;Direct read/write retries to another mongos if possible&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DRIVERS-1571&quot;&gt;DRIVERS-1571&lt;/a&gt; may not execute relevant code paths due to (1) SDAM error handling behavior preceeding suitable server deprioritization and (2) Driver-specific SDAM behavior preventing deduction of a single-mongos connection as a Sharded topology.&lt;/p&gt;

&lt;p&gt;Drivers that have already implemented &lt;a href=&quot;https://jira.mongodb.org/browse/DRIVERS-1571&quot; title=&quot;Direct read/write retries to another mongos if possible&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DRIVERS-1571&quot;&gt;DRIVERS-1571&lt;/a&gt; should update their prose tests accordingly to the new prose test specification; Drivers that have not yet implemented &lt;a href=&quot;https://jira.mongodb.org/browse/DRIVERS-1571&quot; title=&quot;Direct read/write retries to another mongos if possible&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DRIVERS-1571&quot;&gt;DRIVERS-1571&lt;/a&gt; should implement the prose tests according to the updated specification. Drivers are encouraged to confirm that the updated prose tests correctly execute the code paths related to server deprioritization using debuggers, code coverage tools, etc.&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;Motivation&quot;&gt;&lt;/a&gt;&lt;b&gt;Motivation&lt;/b&gt;&lt;/h3&gt;
&lt;h4&gt;&lt;a name=&quot;Whoistheaffectedenduser%3F&quot;&gt;&lt;/a&gt;Who is the affected end user?&lt;/h4&gt;

&lt;p&gt;Drivers implementing &lt;a href=&quot;https://jira.mongodb.org/browse/DRIVERS-1571&quot; title=&quot;Direct read/write retries to another mongos if possible&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DRIVERS-1571&quot;&gt;DRIVERS-1571&lt;/a&gt;.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Howdoesthisaffecttheenduser%3F&quot;&gt;&lt;/a&gt;How does this affect the end user?&lt;/h4&gt;

&lt;p&gt;Prose tests intended to test mongos redirection may not execute related code paths, potentially leading to false-positive test results for incorrect implementation of server deprioritization.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Howlikelyisitthatthisproblemorusecasewilloccur%3F&quot;&gt;&lt;/a&gt;How likely is it that this problem or use case will occur?&lt;/h4&gt;

&lt;p&gt;Testing only.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Iftheproblemdoesoccur%2Cwhataretheconsequencesandhowseverearethey%3F&quot;&gt;&lt;/a&gt;If the problem does occur, what are the consequences and how severe are they?&lt;/h4&gt;

&lt;p&gt;Potential false-positive test results may allow incorrect server deprioritization implementations to slip into Drivers releases and fail to satisfy the requirements of customer requests in &lt;a href=&quot;https://jira.mongodb.org/browse/DRIVERS-1571&quot; title=&quot;Direct read/write retries to another mongos if possible&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DRIVERS-1571&quot;&gt;DRIVERS-1571&lt;/a&gt;.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Isthisissueurgent%3F&quot;&gt;&lt;/a&gt;Is this issue urgent?&lt;/h4&gt;

&lt;p&gt;No.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Isthisticketrequiredbyadownstreamteam%3F&quot;&gt;&lt;/a&gt;Is this ticket required by a downstream team?&lt;/h4&gt;

&lt;p&gt;No.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Isthisticketonlyfortests%3F&quot;&gt;&lt;/a&gt;Is this ticket only for tests?&lt;/h4&gt;

&lt;p&gt;Yes (but may lead to changes to Drivers implementations if removal of potential false-positives uncovers proper test failures).&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;AcceptanceCriteria&quot;&gt;&lt;/a&gt;&lt;b&gt;Acceptance Criteria&lt;/b&gt;&lt;/h3&gt;

&lt;p&gt;N/A&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;</description>
                <environment></environment>
        <key id="2568609">DRIVERS-2828</key>
            <summary>Update prose tests for mongos deprioritization during retryable ops</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="10300" iconUrl="https://jira.mongodb.org/images/icons/priorities/medium.svg">Unknown</priority>
                        <status id="10046" iconUrl="https://jira.mongodb.org/images/icons/statuses/visible.png" description="">In Review</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="ezra.chung@mongodb.com">Ezra Chung</assignee>
                                    <reporter username="ezra.chung@mongodb.com">Ezra Chung</reporter>
                        <labels>
                    </labels>
                <created>Tue, 6 Feb 2024 17:25:10 +0000</created>
                <updated>Tue, 6 Feb 2024 22:15:04 +0000</updated>
                                                                <component>Performance</component>
                    <component>Retryability</component>
                    <component>Server Selection</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
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            <issuekey id="2569009">CSHARP-4958</issuekey>
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            <issuekey id="2569008">CXX-2824</issuekey>
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            <issuekey id="2569010">GODRIVER-3121</issuekey>
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            <issuekey id="2569011">JAVA-5320</issuekey>
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            <issuekey id="2569013">MOTOR-1252</issuekey>
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            <issuekey id="2569012">NODE-5905</issuekey>
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            <issuekey id="2569015">PHPLIB-1391</issuekey>
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            <issuekey id="2569014">PYTHON-4203</issuekey>
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            <issuekey id="2569016">RUBY-3391</issuekey>
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            <issuekey id="2569017">RUST-1842</issuekey>
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            <issuekey id="1628382">DRIVERS-1571</issuekey>
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