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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-57230] mongos doesn&apos;t distribute secondary reads evenly on v4.4 or above</title>
                <link>https://jira.mongodb.org/browse/SERVER-57230</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In v4.2, mongos correctly balanced outgoing read requests to secondary nodes by randomizing the connection order when we issued requests &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7fc6e260eb435b6085d1ef2b1b880d9c75311bf5/src/mongo/client/sdam/server_selector.cpp#L198&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. In v4.4, the introduction of either hedged reads, opportunistic reads, or changes to ConnectionPool have made it such that one of these connections now consistently resolves first, effectively starving one of the secondaries of any reads and unbalancing our read requests. In this ticket, create a unit or integration test to capture this behavior and fix it.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1758419">SERVER-57230</key>
            <summary>mongos doesn&apos;t distribute secondary reads evenly on v4.4 or above</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="3">Duplicate</resolution>
                                        <assignee username="vojislav.stojkovic@mongodb.com">Vojislav Stojkovic</assignee>
                                    <reporter username="tyler.seip@mongodb.com">Tyler Seip</reporter>
                        <labels>
                            <label>servicearch-q4-2021</label>
                            <label>servicearch-wfbf-day</label>
                    </labels>
                <created>Wed, 26 May 2021 21:26:43 +0000</created>
                <updated>Tue, 31 May 2022 18:53:14 +0000</updated>
                            <resolved>Tue, 31 May 2022 18:53:14 +0000</resolved>
                                    <version>4.4.0</version>
                                                                        <votes>2</votes>
                                    <watches>21</watches>
                                                                                                                <comments>
                            <comment id="4584259" author="JIRAUSER1262332" created="Tue, 31 May 2022 18:53:14 +0000"  >&lt;p&gt;Fixed by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65131&quot; title=&quot;Disable opportunistic read targeting (except for hedged reads)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65131&quot;&gt;&lt;del&gt;SERVER-65131&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="4155260" author="JIRAUSER1262719" created="Thu, 28 Oct 2021 17:58:45 +0000"  >&lt;p&gt;De-prioritized, not currently working. Will revisit &amp;amp; keeping assigned to &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tyler.seip&quot; class=&quot;user-hover&quot; rel=&quot;tyler.seip&quot;&gt;tyler.seip&lt;/a&gt;&lt;/p&gt;</comment>
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