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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>[CSHARP-4314] Memory leak when closure/object is used for ClusterConfigurator</title>
                <link>https://jira.mongodb.org/browse/CSHARP-4314</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;h4&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;Summary&lt;/h4&gt;

&lt;p&gt;When using closure or new object and passing its method to &lt;b&gt;ClusterConfigurator&lt;/b&gt; property it causes memory leak because every MongoClient creation leads to hidden threads being created for each client creation.&lt;/p&gt;

&lt;p&gt;Nuget MongoDB.Driver version is 2.17.1.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;HowtoReproduce&quot;&gt;&lt;/a&gt;How to Reproduce&lt;/h4&gt;
&lt;ul&gt;
	&lt;li&gt;Create web application&lt;/li&gt;
	&lt;li&gt;for each web request create new MongoClient which uses this configuration for&#160;&lt;br/&gt;
ClusterConfigurator property.&lt;br/&gt;
&#160;&lt;/li&gt;
&lt;/ul&gt;


&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 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;var mongoConnectionUrl = &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;new&lt;/span&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; MongoUrl(mongoConnectionString);&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 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;var mongoClientSettings =MongoClientSettings.FromUrl(mongoConnectionUrl);&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 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;var c = &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;new&lt;/span&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; Test();&lt;/span&gt;&lt;/pre&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-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;mongoClientSettings.ClusterConfigurator = c.ClusterConfiguration; &lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;
&lt;h4&gt;&lt;a name=&quot;AdditionalBackground&quot;&gt;&lt;/a&gt;Additional Background&lt;/h4&gt;

&lt;p&gt;I think that problem is caused with logic which uses this property to check equality of cluster keys and since we use new object every time when setting this property then equality fails and clusterKey is created every time which leads to RoundTripTimeMonitor being created every time with new thread.&lt;/p&gt;

&lt;p&gt;After some time many threads is created and it can lead to application out of memory crash.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;I understand that it is used to calculate equality but I think that simple assignment of action or method of newly created object should behave same and should not lead to different behavior which in the end leads to out of memory problem.&lt;/p&gt;

&lt;p&gt;Developer cannot know that he can assign only action and cannot assign delegate of newly created object or closure. It is very hidden behavior which is hard to analyze.&lt;/p&gt;

&lt;p&gt;What do you think?&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;I think that it is similar to issue &lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-1947&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/CSHARP-1947&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Thanks&lt;/p&gt;</description>
                <environment></environment>
        <key id="2131997">CSHARP-4314</key>
            <summary>Memory leak when closure/object is used for ClusterConfigurator</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="10300" iconUrl="https://jira.mongodb.org/images/icons/priorities/medium.svg">Unknown</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="13202">Works as Designed</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="dusan.hudecek01@gmail.com">Dusan Hudecek</reporter>
                        <labels>
                    </labels>
                <created>Thu, 8 Sep 2022 14:12:33 +0000</created>
                <updated>Fri, 27 Oct 2023 13:24:40 +0000</updated>
                            <resolved>Mon, 12 Sep 2022 14:39:34 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4817851" author="JIRAUSER1271083" created="Mon, 12 Sep 2022 08:02:33 +0000"  >&lt;p&gt;Hi&#160;@Boris Dogadov,&lt;/p&gt;

&lt;p&gt;now i can see that information in documentation so bug is not bug anymore.&lt;br/&gt;
Still I woud suggest at least to add some info to intellisence for that property or something like that because from C# point of view developer (me) adds action or point to method of object or closure and does not expect it to be a problem I would say. I think it would help developers to quickly find problem if they would do what I did. Just suggestion.&lt;/p&gt;

&lt;p&gt;thanks for your help.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="4815735" author="JIRAUSER1257742" created="Fri, 9 Sep 2022 20:36:07 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dusan.hudecek01%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;dusan.hudecek01@gmail.com&quot;&gt;dusan.hudecek01@gmail.com&lt;/a&gt;, thank you for your question.&lt;/p&gt;

&lt;p&gt;Yes, it is a known behavior, documented here: &lt;a href=&quot;https://mongodb.github.io/mongo-csharp-driver/2.17/reference/driver/connecting/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodb.github.io/mongo-csharp-driver/2.17/reference/driver/connecting/&lt;/a&gt;&lt;br/&gt;
In order to reuse the underlying cluster instance, ClusterConfigurator address has to be the same.&lt;/p&gt;</comment>
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