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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-49696] ReplicaSetMonitor does not randomize host order for getHosts</title>
                <link>https://jira.mongodb.org/browse/SERVER-49696</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Original description: While there is a function to randomly select, it is only used for single host selection &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d4e7ea57599b44353b5393afedee8ae5670837b3/src/mongo/client/sdam/server_selector.cpp#L187&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. This has implications for both connection reuse and read hedging. It means that if we have available connections to all hosts, we will always choose the first one in order if there is an available connection, essentially prioritizing that host. If we are hedging reads, we will also chose the second one in order for our hedge, which prioritizes yet another host and makes that host the one considered the &quot;hedge&quot; for our statistics. We should randomize the multiple host selection &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d4e7ea57599b44353b5393afedee8ae5670837b3/src/mongo/client/sdam/server_selector.cpp#L135-L177&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; as well.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1413517">SERVER-49696</key>
            <summary>ReplicaSetMonitor does not randomize host order for getHosts</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="13201">Fixed</resolution>
                                        <assignee username="lamont.nelson@mongodb.com">Lamont Nelson</assignee>
                                    <reporter username="ben.caimano@mongodb.com">Benjamin Caimano</reporter>
                        <labels>
                    </labels>
                <created>Fri, 17 Jul 2020 17:21:58 +0000</created>
                <updated>Sun, 29 Oct 2023 22:05:38 +0000</updated>
                            <resolved>Wed, 22 Jul 2020 00:54:25 +0000</resolved>
                                                    <fixVersion>4.4.0-rc14</fixVersion>
                                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="3295788" author="xgen-internal-githook" created="Wed, 22 Jul 2020 00:46:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;LaMont Nelson&apos;, &apos;email&apos;: &apos;lamont.nelson@mongodb.com&apos;, &apos;username&apos;: &apos;lamontnelson&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49696&quot; title=&quot;ReplicaSetMonitor does not randomize host order for getHosts&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49696&quot;&gt;&lt;del&gt;SERVER-49696&lt;/del&gt;&lt;/a&gt; randomize host order for getHosts&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 6fc13dc855f3ead1678072e4b9bf9ab645e5fd49)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9ec0c9163ada14852b7b7814dfc829b92e4933cf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9ec0c9163ada14852b7b7814dfc829b92e4933cf&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3295784" author="xgen-internal-githook" created="Wed, 22 Jul 2020 00:34:21 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;LaMont Nelson&apos;, &apos;email&apos;: &apos;lamont.nelson@mongodb.com&apos;, &apos;username&apos;: &apos;lamontnelson&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49696&quot; title=&quot;ReplicaSetMonitor does not randomize host order for getHosts&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49696&quot;&gt;&lt;del&gt;SERVER-49696&lt;/del&gt;&lt;/a&gt; randomize host order for getHosts&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6fc13dc855f3ead1678072e4b9bf9ab645e5fd49&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6fc13dc855f3ead1678072e4b9bf9ab645e5fd49&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3295032" author="lamont.nelson" created="Tue, 21 Jul 2020 18:02:41 +0000"  >&lt;p&gt;&lt;a href=&quot;https://evergreen.mongodb.com/version/5f172cc39ccd4e7feacd1092&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://evergreen.mongodb.com/version/5f172cc39ccd4e7feacd1092&lt;/a&gt;&lt;/p&gt;</comment>
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                            <attachment id="270382" name="rsm_host_order.js" size="1295" author="ben.caimano@mongodb.com" created="Fri, 17 Jul 2020 17:56:39 +0000"/>
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