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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-75279] Exchange producer/consumer may get stuck if number of producers is close to number of read tickets</title>
                <link>https://jira.mongodb.org/browse/SERVER-75279</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When we spawn exchange producer threads, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5ebfd6db784e30ac7e1862fc9aee7a2cc4d62e8f/src/mongo/db/exec/sbe/stages/exchange.cpp#L515&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;each one takes a global IS lock&lt;/a&gt; (and thus also takes a read ticket). If the number of read tickets is less than, equal to, or just slightly above the number of producers we&apos;re creating, we may get stuck; some of the producers will queue for a read ticket and block at the global lock acquisition forever.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2297763">SERVER-75279</key>
            <summary>Exchange producer/consumer may get stuck if number of producers is close to number of read tickets</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="svilen.mihaylov@mongodb.com">Svilen Mihaylov</assignee>
                                    <reporter username="gregory.noma@mongodb.com">Gregory Noma</reporter>
                        <labels>
                    </labels>
                <created>Fri, 24 Mar 2023 19:33:42 +0000</created>
                <updated>Sun, 29 Oct 2023 21:24:15 +0000</updated>
                            <resolved>Wed, 29 Mar 2023 18:44:49 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="5309812" author="xgen-internal-githook" created="Wed, 29 Mar 2023 17:34:51 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Svilen Mihaylov&apos;, &apos;email&apos;: &apos;svilen.mihaylov@mongodb.com&apos;, &apos;username&apos;: &apos;svilen-mihaylov&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-75279&quot; title=&quot;Exchange producer/consumer may get stuck if number of producers is close to number of read tickets&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-75279&quot;&gt;&lt;del&gt;SERVER-75279&lt;/del&gt;&lt;/a&gt; Exchange producer/consumer may get stuck if number of producers is close to number of read tickets&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/dd4f313efac46093e92d8a5fe0049df69b4d549d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/dd4f313efac46093e92d8a5fe0049df69b4d549d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5306427" author="alya.berciu" created="Tue, 28 Mar 2023 16:11:35 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.storch%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;david.storch@mongodb.com&quot;&gt;david.storch@mongodb.com&lt;/a&gt; I created a dedicated ticket (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-75383&quot; title=&quot;Temporarily disable cqf_parallel tests&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-75383&quot;&gt;&lt;del&gt;SERVER-75383&lt;/del&gt;&lt;/a&gt;) to disable the tests, and marked the BF as dependent on that, so that we can resolve the BF. Given that this is a real bug, could we move it back to the QE backlog and schedule it whenever we prioritize intra-query parallelism? At that point, we could also try re-enabling the failing tests.&lt;/p&gt;

&lt;p&gt;CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=svilen.mihaylov%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;svilen.mihaylov@mongodb.com&quot;&gt;svilen.mihaylov@mongodb.com&lt;/a&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="5302740" author="alya.berciu" created="Mon, 27 Mar 2023 14:40:40 +0000"  >&lt;p&gt;Reassigning to QE, since this appears to happen in SBE code.&lt;/p&gt;</comment>
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            <issuekey id="2300435">SERVER-75423</issuekey>
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