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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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            <title>[JAVA-4645] Investigate ThreadLocalRandom interaction with virtual threads</title>
                <link>https://jira.mongodb.org/browse/JAVA-4645</link>
                <project id="10006" key="JAVA">Java Driver</project>
                    <description>&lt;p&gt;The driver uses &lt;tt&gt;ThreadLocalRandom&lt;/tt&gt; in a couple of places.  It&apos;s not clear how &lt;tt&gt;ThreadLocalRandom&lt;/tt&gt; will work in a world with millions of virtual threads.  It appears that in Java 19 &lt;tt&gt;ThreadLocalRandom#localInit&lt;/tt&gt; will be called on every invocation of &lt;tt&gt;ThreadLocalRandom#current&lt;/tt&gt;, which seems undesirable.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2067673">JAVA-4645</key>
            <summary>Investigate ThreadLocalRandom interaction with virtual threads</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="10300" iconUrl="https://jira.mongodb.org/images/icons/priorities/medium.svg">Unknown</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="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="jeff.yemin@mongodb.com">Jeffrey Yemin</reporter>
                        <labels>
                            <label>loom</label>
                    </labels>
                <created>Mon, 13 Jun 2022 21:06:07 +0000</created>
                <updated>Thu, 7 Sep 2023 18:17:28 +0000</updated>
                            <resolved>Thu, 7 Sep 2023 18:17:28 +0000</resolved>
                                                                    <component>Internal</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5284493" author="jeff.yemin" created="Mon, 20 Mar 2023 12:59:34 +0000"  >&lt;p&gt;I looked into this a bit more and it seems &lt;tt&gt;ThreadLocalRandom#localInit&lt;/tt&gt; is not very expensive in time or space.  It&apos;s essentially one CAS operation and a bit of constant-time arithmetic, resulting ultimately in the initialization of a couple of integers in the Thread instance.&lt;/p&gt;</comment>
                            <comment id="4633919" author="JIRAUSER1269643" created="Wed, 22 Jun 2022 22:15:53 +0000"  >&lt;p&gt;If this is truly a significant problem, we might consider rolling our own PRNG/seeding that is weaker than ThreadLocalRandom but still strong enough for our purposes. For example, we might seed Random using (thread_id xor time).&lt;/p&gt;</comment>
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2.  Would you like the user to see examples of the syntax and/or executable code and its output?&lt;br/&gt;
3.  Which versions of the driver/connector does this apply to?&lt;/p&gt;</customfieldvalue>

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