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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-41543] make RSM::getHostsOrRefresh return unpreferred hosts last</title>
                <link>https://jira.mongodb.org/browse/SERVER-41543</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Right now the ReplicaSetMonitor::getHostsOrRefresh only returns the non-preferred option (for PrimaryPreferred and SecondaryPreferred) when the preferred options are completely untargettable.&lt;/p&gt;

&lt;p&gt;But, after &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41133&quot; title=&quot;Add TaskExecutor::scheduleRemoteCommandOnAny&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41133&quot;&gt;&lt;del&gt;SERVER-41133&lt;/del&gt;&lt;/a&gt;, we&apos;ll be able to take advantage of  the lists of hosts returned in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41134&quot; title=&quot;Add RSM::findHostsWithMaxWait&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41134&quot;&gt;&lt;del&gt;SERVER-41134&lt;/del&gt;&lt;/a&gt;, and we can weaken our notion of &quot;preferred&quot; from &quot;is targettable&quot; to &quot;has a connection available&quot;&lt;/p&gt;

&lt;p&gt;I.e. if matchingHosts = &lt;/p&gt;
{ secondary1, secondary2, primary }
&lt;p&gt; (where 50% of the time we swap secondary 1 and secondary 2) we have the technology to select a secondary, falling back to the primary, in the order a connection becomes available.  In a system with &quot;enough&quot; connections, that should send all traffic to secondaries, and only route to the primary when we have no connections available.  I think this weakening is inline with the rest of the work in PM-856&lt;/p&gt;
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                <environment></environment>
        <key id="789976">SERVER-41543</key>
            <summary>make RSM::getHostsOrRefresh return unpreferred hosts last</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="mira.carey@mongodb.com">Mira Carey</reporter>
                        <labels>
                    </labels>
                <created>Wed, 5 Jun 2019 15:34:35 +0000</created>
                <updated>Tue, 6 Dec 2022 02:57:51 +0000</updated>
                            <resolved>Mon, 25 Apr 2022 17:59:29 +0000</resolved>
                                                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4262669" author="JIRAUSER1262719" created="Tue, 21 Dec 2021 21:32:14 +0000"  >&lt;p&gt;We haven&#8217;t heard back from you in at least 1 year, so I&apos;m going to close this ticket. If this is still an issue for you, please provide additional information and we will reopen the ticket.&lt;/p&gt;</comment>
                            <comment id="2638327" author="ratika.gandhi" created="Tue, 17 Dec 2019 18:37:05 +0000"  >&lt;p&gt;cc.&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=garaudy.etienne&quot; class=&quot;user-hover&quot; rel=&quot;garaudy.etienne&quot;&gt;garaudy.etienne&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2272455" author="jason.carey" created="Wed, 5 Jun 2019 15:36:51 +0000"  >&lt;p&gt;If we were to pursue PM-856 in the drivers, this change would probably also make sense (I.e. weakening XXXPreferred read preferences)&lt;/p&gt;</comment>
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