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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>
    </build-info>


<item>
            <title>[SERVER-16426] d_migrate getActive() mtx is very hot</title>
                <link>https://jira.mongodb.org/browse/SERVER-16426</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This shows up a lot, together with Top stats lock (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16342&quot; title=&quot;Top stats lock is hot&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16342&quot;&gt;&lt;del&gt;SERVER-16342&lt;/del&gt;&lt;/a&gt;), in insert only workload(s), e.g. sysbench, when the storage engine is WT.&lt;br/&gt;
Not sure why that code is called when mongod is run as standalone. Probably can be avoided.&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;VTune output attached.&lt;/p&gt;</description>
                <environment></environment>
        <key id="172866">SERVER-16426</key>
            <summary>d_migrate getActive() mtx is very hot</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="3">Duplicate</resolution>
                                        <assignee username="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="davide.italiano">Davide Italiano</reporter>
                        <labels>
                            <label>28qa</label>
                    </labels>
                <created>Fri, 5 Dec 2014 00:54:18 +0000</created>
                <updated>Sat, 24 Jan 2015 17:18:27 +0000</updated>
                            <resolved>Thu, 18 Dec 2014 19:17:22 +0000</resolved>
                                    <version>2.8.0-rc2</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="789818" author="renctan" created="Thu, 18 Dec 2014 19:22:08 +0000"  >&lt;p&gt;Changes in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16432&quot; title=&quot;Chunk migration data structures not properly synchronized with storage engines that offer document-level locking&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16432&quot;&gt;&lt;del&gt;SERVER-16432&lt;/del&gt;&lt;/a&gt; made it such that MigrateFromStatus::_mutex is no longer acquired inside MigrateFromStatus::logOp unless the write is touching the ns being migrated.&lt;/p&gt;</comment>
                            <comment id="783027" author="schwerin" created="Wed, 10 Dec 2014 19:20:51 +0000"  >&lt;p&gt;I expect this to be fixed as a side-effect of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16432&quot; title=&quot;Chunk migration data structures not properly synchronized with storage engines that offer document-level locking&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16432&quot;&gt;&lt;del&gt;SERVER-16432&lt;/del&gt;&lt;/a&gt;, in which Randolph will be cleaning up the synchronization rules for chunk migration data structures in mongod.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="172933">SERVER-16432</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="171590">SERVER-16342</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                    </issuelinks>
                <attachments>
                            <attachment id="58743" name="cmdcachemutex.png" size="480323" author="davide.italiano" created="Fri, 5 Dec 2014 00:54:18 +0000"/>
                    </attachments>
                <subtasks>
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