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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-24338] In-memory data structures for latency histogram</title>
                <link>https://jira.mongodb.org/browse/SERVER-24338</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We need to design in-memory data structures for the operation latency histogram and find an appropriate place to store them.&lt;/p&gt;

&lt;p&gt;These data structures include (but might not be limited to)&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;an actual histogram class with a fast increment operation&lt;/li&gt;
	&lt;li&gt;a namespace-to-histogram map&lt;/li&gt;
	&lt;li&gt;a command name-to-histogram type map (i.e. is this a read/write/command)&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="290688">SERVER-24338</key>
            <summary>In-memory data structures for latency histogram</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="9">Done</resolution>
                                        <assignee username="kevin.albertson@mongodb.com">Kevin Albertson</assignee>
                                    <reporter username="kyle.suarez@mongodb.com">Kyle Suarez</reporter>
                        <labels>
                    </labels>
                <created>Wed, 1 Jun 2016 13:34:53 +0000</created>
                <updated>Wed, 5 Apr 2017 16:43:45 +0000</updated>
                            <resolved>Mon, 13 Jun 2016 20:28:51 +0000</resolved>
                                                                    <component>Diagnostics</component>
                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1292732" author="kyle.suarez" created="Mon, 13 Jun 2016 20:28:51 +0000"  >&lt;p&gt;Proof-of-concept is complete and code/reviews will be tracked in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5905&quot; title=&quot;Add data collection and command to get histogram of query response times&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5905&quot;&gt;&lt;del&gt;SERVER-5905&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="1280979" author="kyle.suarez" created="Wed, 1 Jun 2016 13:50:13 +0000"  >&lt;p&gt;We&apos;ll also have to consider the locking on these data structures:&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;The global histogram can have its own lock.&lt;/li&gt;
	&lt;li&gt;Collection-level histograms will probably need some sort of collection lock. For write operations, we&apos;ll already have an X or IX lock; for read operations it might be trickier.&lt;/li&gt;
&lt;/ul&gt;
</comment>
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