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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-37479] report amount of time that a locker blocks other acquirers</title>
                <link>https://jira.mongodb.org/browse/SERVER-37479</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently we report how long threads waited to acquire locks, but it is harder to find the reason why the lock wasn&apos;t granted. By adding statistics on how long a locker holds a lock while blocking other threads, we could surface problematic lockers.&lt;/p&gt;

&lt;p&gt;This should be straightforward to implement, because we already have the appropriate lock manager bucket locked when queuing the request, so we can just add a start block time to the granted request. &lt;/p&gt;</description>
                <environment></environment>
        <key id="614343">SERVER-37479</key>
            <summary>report amount of time that a locker blocks other acquirers</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="geert.bosch@mongodb.com">Geert Bosch</assignee>
                                    <reporter username="geert.bosch@mongodb.com">Geert Bosch</reporter>
                        <labels>
                            <label>SWDI</label>
                    </labels>
                <created>Thu, 4 Oct 2018 20:33:55 +0000</created>
                <updated>Tue, 8 Jun 2021 14:28:16 +0000</updated>
                            <resolved>Tue, 12 May 2020 21:47:23 +0000</resolved>
                                                                    <component>Concurrency</component>
                    <component>Diagnostics</component>
                                        <votes>1</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="3080933" author="geert.bosch" created="Tue, 12 May 2020 15:33:35 +0000"  >&lt;p&gt;We decided to not implement this feature for the following reasons:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;This ticket is trickier to implement than initially expected.&lt;/li&gt;
	&lt;li&gt;This ticket would only give blocking information after the operation holding the lock has finished, while trouble shooting problems generally need to know what is currently blocking an operation. For this purpose we have added more locking information to &lt;tt&gt;currentOp&lt;/tt&gt; and &lt;tt&gt;lockInfo&lt;/tt&gt; commands.&lt;/li&gt;
	&lt;li&gt;The same people that would add this additional diagnostics info are currently working on removing locks. We think it is more valuable to remove locks from readers than to add additional diagnostics to deal with these long-running readers holding locks.&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="3079092" author="connie.chen" created="Mon, 11 May 2020 18:09:36 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=geert.bosch&quot; class=&quot;user-hover&quot; rel=&quot;geert.bosch&quot;&gt;geert.bosch&lt;/a&gt;&#160;Could you give an overview of the work effort needed to complete this?&lt;/p&gt;</comment>
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