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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-70129] std::random_device should be created per thread in the balancer</title>
                <link>https://jira.mongodb.org/browse/SERVER-70129</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As part of introducing the defragmentation policy, we introduced a secondary thread in the balancer. This thread processes the non-migration requests from the defragmentation policy.&lt;/p&gt;

&lt;p&gt;This thread randomizes which collections it works on using std::uniform_int_distribution. The std::uniform_int_distribution uses a random device to create the distribution. Currently, we are using the same random device on both the main balancer thread and on the new secondary thread.&lt;/p&gt;

&lt;p&gt;We instead need to create a separate random device for each thread of the balancer.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2148726">SERVER-70129</key>
            <summary>std::random_device should be created per thread in the balancer</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="enrico.golfieri@mongodb.com">Enrico Golfieri</assignee>
                                    <reporter username="allison.easton@mongodb.com">Allison Easton</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Fri, 30 Sep 2022 10:19:33 +0000</created>
                <updated>Sun, 29 Oct 2023 21:32:35 +0000</updated>
                            <resolved>Tue, 1 Nov 2022 08:57:38 +0000</resolved>
                                                    <fixVersion>6.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4939649" author="xgen-internal-githook" created="Mon, 31 Oct 2022 14:47:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Enrico Golfieri&apos;, &apos;email&apos;: &apos;enrico.golfieri@mongodb.com&apos;, &apos;username&apos;: &apos;enricogolfieri&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70129&quot; title=&quot;std::random_device should be created per thread in the balancer&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70129&quot;&gt;&lt;del&gt;SERVER-70129&lt;/del&gt;&lt;/a&gt; std::random_device should be created per thread in the balancer&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/77a5f7df727381c62791bb56f009438657c3a1c7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/77a5f7df727381c62791bb56f009438657c3a1c7&lt;/a&gt;&lt;/p&gt;</comment>
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