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    <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-41248] Ensure ReplicaSetMonitor initializes its random state with truly random data</title>
                <link>https://jira.mongodb.org/browse/SERVER-41248</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The replica set monitor in older versions of the server initializes it&apos;s random state via:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/db19e7ce84cfd702a4ba9983ee2ea5019f470f82/src/mongo/client/replica_set_monitor.cpp#L1010&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;replica_set_monitor.cpp:1010&lt;/a&gt;&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;which has the unfortunate side effect of being strongly synchronized with the system clock.  This can cause non-random patterns of access across a mongos / series of mongos&apos; in cases where all of the nodes are restarted at the same time and work is distributed evenly across the various mongos&apos;.&lt;/p&gt;

&lt;p&gt;Switching to use a real source of randomness for seeding the prngs in each set state should improve the real randomness of later server selection&lt;/p&gt;

&lt;hr /&gt;

&lt;p&gt;Note: It appears this was fixed in 4.2 as part of unrelated code changes&lt;/p&gt;</description>
                <environment></environment>
        <key id="772484">SERVER-41248</key>
            <summary>Ensure ReplicaSetMonitor initializes its random state with truly random data</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="ben.caimano@mongodb.com">Benjamin Caimano</assignee>
                                    <reporter username="mira.carey@mongodb.com">Mira Carey</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Mon, 20 May 2019 19:41:50 +0000</created>
                <updated>Sun, 29 Oct 2023 22:20:50 +0000</updated>
                            <resolved>Mon, 19 Aug 2019 18:08:34 +0000</resolved>
                                    <version>3.6.12</version>
                    <version>4.0.9</version>
                                    <fixVersion>3.6.14</fixVersion>
                    <fixVersion>4.0.13</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="2373789" author="xgen-internal-githook" created="Thu, 15 Aug 2019 16:46:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;shailejajain&apos;, &apos;email&apos;: &apos;shaileja.jain@gmail.com&apos;, &apos;name&apos;: &apos;Shaileja Jain&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41248&quot; title=&quot;Ensure ReplicaSetMonitor initializes its random state with truly random data&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41248&quot;&gt;&lt;del&gt;SERVER-41248&lt;/del&gt;&lt;/a&gt; Ensure ReplicaSetMonitor initializes its random state with truly random data&lt;/p&gt;

&lt;p&gt;(cherry picked from commit ee71321881cfa25c0eba4948a71a9a6f6e5076a8)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/21c694fda7114932d73795f89ff52b25f8ec09c6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/21c694fda7114932d73795f89ff52b25f8ec09c6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2364990" author="shelley.jain" created="Fri, 9 Aug 2019 17:15:53 +0000"  >&lt;p&gt;4.0 is in code freeze.&lt;/p&gt;</comment>
                            <comment id="2364802" author="xgen-internal-githook" created="Fri, 9 Aug 2019 15:34:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Shaileja Jain&apos;, &apos;username&apos;: &apos;shailejajain&apos;, &apos;email&apos;: &apos;shaileja.jain@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41248&quot; title=&quot;Ensure ReplicaSetMonitor initializes its random state with truly random data&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41248&quot;&gt;&lt;del&gt;SERVER-41248&lt;/del&gt;&lt;/a&gt; Ensure ReplicaSetMonitor initializes its random state with truly random data&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ee71321881cfa25c0eba4948a71a9a6f6e5076a8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ee71321881cfa25c0eba4948a71a9a6f6e5076a8&lt;/a&gt;&lt;/p&gt;</comment>
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