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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>
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<item>
            <title>[SERVER-35940] Remove IntrusiveCounter in favor of RefCountable</title>
                <link>https://jira.mongodb.org/browse/SERVER-35940</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;tt&gt;IntrusiveCounter&lt;/tt&gt; is a base class used to make a type suitable for use with &lt;tt&gt;boost::intrusive_ptr&lt;/tt&gt;. It has surprising behavior under concurrency, which can lead to bugs such as &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32007&quot; title=&quot;ExpressionDateFromString::evaluate() is not thread safe&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32007&quot;&gt;&lt;del&gt;SERVER-32007&lt;/del&gt;&lt;/a&gt;. &lt;tt&gt;RefCountable&lt;/tt&gt; is a superior alternative. We should migrate existing uses of &lt;tt&gt;IntrusiveCounter&lt;/tt&gt; to &lt;tt&gt;RefCountable&lt;/tt&gt;, and delete the &lt;tt&gt;IntrusiveCounter&lt;/tt&gt; code. As of this writing, the only remaining subclass of &lt;tt&gt;IntrusiveCounter&lt;/tt&gt; is &lt;tt&gt;DocumentSource&lt;/tt&gt; in the aggregation framework code.&lt;/p&gt;</description>
                <environment></environment>
        <key id="566718">SERVER-35940</key>
            <summary>Remove IntrusiveCounter in favor of RefCountable</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="13201">Fixed</resolution>
                                        <assignee username="martin.neupauer@mongodb.com">Martin Neupauer</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Mon, 2 Jul 2018 16:25:54 +0000</created>
                <updated>Sun, 29 Oct 2023 22:30:11 +0000</updated>
                            <resolved>Tue, 10 Jul 2018 17:41:42 +0000</resolved>
                                                    <fixVersion>4.1.1</fixVersion>
                                    <component>Aggregation Framework</component>
                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1943416" author="xgen-internal-githook" created="Tue, 10 Jul 2018 17:41:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;MartinNeupauer&apos;, &apos;name&apos;: &apos;Martin Neupauer&apos;, &apos;email&apos;: &apos;martin.neupauer@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35940&quot; title=&quot;Remove IntrusiveCounter in favor of RefCountable&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35940&quot;&gt;&lt;del&gt;SERVER-35940&lt;/del&gt;&lt;/a&gt; Remove IntrusiveCounter&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/01cf7a585de2942562837077dff73968562b91f3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/01cf7a585de2942562837077dff73968562b91f3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1941015" author="david.storch" created="Fri, 6 Jul 2018 20:10:18 +0000"  >&lt;p&gt;Reopening. The patch pushed thus far removes the last usage of &lt;tt&gt;InstrusiveCounter&lt;/tt&gt; and &lt;tt&gt;IntrusiveCounterUnsigned&lt;/tt&gt;. We should push one more patch to delete these two classes entirely.&lt;/p&gt;</comment>
                            <comment id="1940950" author="xgen-internal-githook" created="Fri, 6 Jul 2018 19:14:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;MartinNeupauer&apos;, &apos;name&apos;: &apos;Martin Neupauer&apos;, &apos;email&apos;: &apos;martin.neupauer@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35894&quot; title=&quot;Create a $exchange producer stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35894&quot;&gt;&lt;del&gt;SERVER-35894&lt;/del&gt;&lt;/a&gt; The initial implementation of the producer document source&lt;br/&gt;
             for the exchange operator.&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35940&quot; title=&quot;Remove IntrusiveCounter in favor of RefCountable&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35940&quot;&gt;&lt;del&gt;SERVER-35940&lt;/del&gt;&lt;/a&gt; Remove IntrusiveCounter in favor of RefCountable.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fda766f6be1a20fa28ce361511bc62e5c995186b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fda766f6be1a20fa28ce361511bc62e5c995186b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1937731" author="charlie.swanson" created="Tue, 3 Jul 2018 13:54:02 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=Martin.neupauer&quot; class=&quot;user-hover&quot; rel=&quot;Martin.neupauer&quot;&gt;Martin.neupauer&lt;/a&gt; encountered the same issue while working on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35894&quot; title=&quot;Create a $exchange producer stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35894&quot;&gt;&lt;del&gt;SERVER-35894&lt;/del&gt;&lt;/a&gt;. His issue was with DocumentSource, but he believes he can do the same replacement for Expression.&lt;/p&gt;

&lt;p&gt;Assigning to him for this sprint since he&apos;s already started working on it.&lt;/p&gt;</comment>
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