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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-15715] find_and_modify appears to be taking a DB_X lock</title>
                <link>https://jira.mongodb.org/browse/SERVER-15715</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Problem:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/commands/find_and_modify.cpp#L329&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/db/commands/find_and_modify.cpp#L329&lt;/a&gt;&lt;/p&gt;

&lt;p/&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            Lock::DBLock dbXLock(txn-&amp;gt;lockState(), dbname, MODE_X);&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Solution:&lt;br/&gt;
Take a Collection level lock.&lt;/p&gt;</description>
                <environment></environment>
        <key id="164286">SERVER-15715</key>
            <summary>find_and_modify appears to be taking a DB_X lock</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="9">Done</resolution>
                                        <assignee username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="alvin">Alvin Richards</reporter>
                        <labels>
                            <label>28qa</label>
                    </labels>
                <created>Fri, 17 Oct 2014 21:52:14 +0000</created>
                <updated>Mon, 11 Jul 2016 17:16:50 +0000</updated>
                            <resolved>Fri, 5 Dec 2014 21:11:20 +0000</resolved>
                                    <version>2.7.7</version>
                                    <fixVersion>2.8.0-rc3</fixVersion>
                                    <component>Concurrency</component>
                                        <votes>0</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="779884" author="xgen-internal-githook" created="Fri, 5 Dec 2014 21:08:30 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15715&quot; title=&quot;find_and_modify appears to be taking a DB_X lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15715&quot;&gt;&lt;del&gt;SERVER-15715&lt;/del&gt;&lt;/a&gt; Remove the usage of DBDirectClient in findAndModify&lt;/p&gt;

&lt;p&gt;This also removes the entire sort/no-sort branching and the usage of DB X&lt;br/&gt;
lock.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ac13fc6ab3ea3a3800ac494596acf2eb40beec72&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ac13fc6ab3ea3a3800ac494596acf2eb40beec72&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="744697" author="eliot" created="Sat, 18 Oct 2014 01:44:58 +0000"  >&lt;p&gt;Can easy and safely be moved to collection MODE_X, at the very least we should do that.&lt;br/&gt;
Pretty sure its safe anyway with any transactional engine.&lt;/p&gt;</comment>
                            <comment id="744629" author="geert.bosch" created="Fri, 17 Oct 2014 22:11:01 +0000"  >&lt;p&gt;This was in my original CLL patch, but got taken out during review because of concerns about safety. Needs more auditing.&lt;/p&gt;</comment>
                            <comment id="744625" author="dan@10gen.com" created="Fri, 17 Oct 2014 22:06:57 +0000"  >&lt;p&gt;depends on deadlock detection work&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="11960">SERVER-1117</issuekey>
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            <issuelink>
            <issuekey id="199594">SERVER-18173</issuekey>
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                                        <issuelink>
            <issuekey id="173397">SERVER-16469</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="175383">SERVER-16601</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="168391">SERVER-16063</issuekey>
        </issuelink>
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