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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-74545] PriorityTicketHolder doesn&apos;t track operations that requeue after 500millis </title>
                <link>https://jira.mongodb.org/browse/SERVER-74545</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It could be interesting to track the number of operations that &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b3f5f1102cfe8ec69e55803ec3d057cecedbfc1a/src/mongo/util/concurrency/priority_ticketholder.cpp#L115&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;time out at 500 milliseconds in a queue, wake up, and requeue&lt;/a&gt; for a ticket.&lt;/p&gt;

&lt;p&gt;Motivation: It could provide insight into what conditions cause the operations to get stuck in the queue &amp;amp; the side effects on latency and throughput when operations must wakeup to requeue. &lt;/p&gt;


&lt;p&gt;Example: Suppose 50th percentile latency is ~500 milliseconds, do we see higher tail latencies than expected? should we reconsider the 500 milliseconds timeout?&lt;/p&gt;

&lt;p&gt;Right now, we measure the number of cumulative number operations queued in the PriorityTicketHolder at the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2a63799389d72a64cdfd9f19eb589a24ca56524a/src/mongo/util/concurrency/ticketholder.cpp#L127&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;TicketHolderWithQueueingStats&lt;/a&gt; level. This means, it does not take into account the number of items that must requeue. &lt;/p&gt;</description>
                <environment></environment>
        <key id="2279715">SERVER-74545</key>
            <summary>PriorityTicketHolder doesn&apos;t track operations that requeue after 500millis </summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="haley.connelly@mongodb.com">Haley Connelly</reporter>
                        <labels>
                    </labels>
                <created>Thu, 2 Mar 2023 16:02:03 +0000</created>
                <updated>Tue, 18 Apr 2023 16:58:39 +0000</updated>
                            <resolved>Tue, 14 Mar 2023 15:50:24 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5246264" author="haley.connelly" created="Fri, 3 Mar 2023 09:54:53 +0000"  >&lt;p&gt;I doubt it is the cause of too much, but given we know the PriorityTicketHolder is slightly slower due to extra concurrency synchronisation, I was wondering if 500millis isn&apos;t enough to give operations a chance when queueing is high.&#160;&lt;/p&gt;</comment>
                            <comment id="5246237" author="louis.williams" created="Fri, 3 Mar 2023 09:46:06 +0000"  >&lt;p&gt;The 500ms timeout + requeue is also happening in the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/13a0cc30408a8c9f9c84c1df37166a8ed5280690/src/mongo/util/concurrency/semaphore_ticketholder.cpp#L107&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;semaphore ticketholder&lt;/a&gt;, so I would be interested if this is the cause and if so, why it is more expensive.&lt;/p&gt;</comment>
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            <issuekey id="2307123">SERVER-75677</issuekey>
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