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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>[JAVA-2053] Default NioEventLoopGroup created by driver must be closed</title>
                <link>https://jira.mongodb.org/browse/JAVA-2053</link>
                <project id="10006" key="JAVA">Java Driver</project>
                    <description>&lt;p&gt;From &lt;a href=&quot;https://groups.google.com/forum/?utm_medium=email&amp;amp;utm_source=footer#!msg/mongodb-user/ynz9LfmgjV0/igj2MXgXAwAJ&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://groups.google.com/forum/?utm_medium=email&amp;amp;utm_source=footer#!msg/mongodb-user/ynz9LfmgjV0/igj2MXgXAwAJ&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;We&apos;re using the async driver in a webapp deployed to Tomcat (v8, along with Java 8).  After Tomcat is shut down, its log file (catalina.out) has several entries that read something like this:&lt;/p&gt;

&lt;p&gt;The web application appears to have started a thread named nioEventLoopGroup-2-1 but has failed to stop it. This is very likely to create a memory leak.&lt;/p&gt;

&lt;p&gt;The culprit is com.mongodb.connection.netty.NettyStreamFactoryFactory.  It creates an instance of NioEventLoopGroup but never shuts it down.  &lt;/p&gt;

&lt;p&gt;We&apos;re using Spring and our solution was to write our own StreamFactoryFactory that is identical to NettyStreamFactoryFactory except in two ways.  It&apos;s annotated with @Component (so its lifecycle is managed by Spring) and it has the following method:&lt;/p&gt;

&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: gray; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;@PreDestroy&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: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;public&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; &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;void&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; shutdown()&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;{&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;   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;  eventLoopGroup.shutdownGracefully().awaitUniterruptibly();&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt; For those not using Spring I recommend creating doing something like this...&lt;/p&gt;

&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;EventLoopGroup myEventLoopGroup = &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; NioEventLoopGroup();&lt;/span&gt;&lt;/pre&gt;
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					&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;StreamFactoryFactory myStreamFactoryFactory = &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; NettyStreamFactoryFactory(myEventLoopGroup, ByteBufAllocator.DEFAULT);&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;...and shut down myEventLoopGroup yourself at the appropriate time.&lt;/p&gt;

&lt;p&gt;The async driver should properly manage the EventLoopGroup it creates...we had to kill Tomcat manually until we figured out the simple fix.&lt;/p&gt;</description>
                <environment></environment>
        <key id="242343">JAVA-2053</key>
            <summary>Default NioEventLoopGroup created by driver must be closed</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="9">Done</resolution>
                                        <assignee username="jeff.yemin@mongodb.com">Jeffrey Yemin</assignee>
                                    <reporter username="jeff.yemin@mongodb.com">Jeffrey Yemin</reporter>
                        <labels>
                    </labels>
                <created>Fri, 4 Dec 2015 18:38:08 +0000</created>
                <updated>Wed, 27 Feb 2019 21:10:49 +0000</updated>
                            <resolved>Tue, 4 Oct 2016 18:58:50 +0000</resolved>
                                    <version>3.2.0</version>
                                    <fixVersion>3.4.0</fixVersion>
                                    <component>Async</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2165317" author="jeff.yemin" created="Wed, 27 Feb 2019 21:10:49 +0000"  >&lt;p&gt;Also, just so you&apos;re aware the driver now has &quot;native&quot; async TLS support so Netty is no longer strictly required.  &lt;/p&gt;

&lt;p&gt;I think it&apos;s going to be difficult for the driver to handle this seamlessly given that at the point the driver is given the factory it&apos;s as a &lt;tt&gt;StreamFactoryFactory&lt;/tt&gt;, which doesn&apos;t even have a close method, and even if it did, the driver wouldn&apos;t know whether the instance is being shared in the application with multiple MongoClient instances.&lt;/p&gt;

&lt;p&gt;I guess the question is whether it&apos;s worth adding a resource closer callback to MongoClientSettings just to handle this case, or leave it up to the application to close the EventLoopGroup after closing the MongoClient.  &lt;/p&gt;
</comment>
                            <comment id="2165305" author="smfitts@gmail.com" created="Wed, 27 Feb 2019 21:07:46 +0000"  >&lt;p&gt;Fair enough &#8211; I did manage to miss that.&#160; Is there a way to get the external resource closer set that I missed as well (the only path I saw for that involved using the connection string, which I don&apos;t want to do.&lt;/p&gt;</comment>
                            <comment id="2165300" author="smfitts@gmail.com" created="Wed, 27 Feb 2019 21:04:26 +0000"  >&lt;p&gt;Also, even in the case where the event loop group is supplied by the caller, it doesn&apos;t seem possible to get the cleanup to happen when you would like.&#160; Ideally I&apos;d like to pass in the handler to call when things are being shut down (aka have some way to set the external resource closer), but there is no way to do that currently.&lt;/p&gt;</comment>
                            <comment id="2165297" author="jeff.yemin" created="Wed, 27 Feb 2019 21:03:59 +0000"  >&lt;p&gt;Seems we had to do that for backwards compatibility.  We did add this Javadoc, but I can see how it&apos;s easy to miss.&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&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;   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;        /**&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;   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;         * Sets the event loop group.&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;         *&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;   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;         * &amp;lt;p&amp;gt;It is highly recommended to supply your own event loop group and manage its shutdown.  Otherwise, the event&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;   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;         * loop group created by default will not be shutdown properly.&amp;lt;/p&amp;gt;&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;   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;         *&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;   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;         * @param eventLoopGroup the event loop group that all channels created by this factory will be a part of&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;   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;         * @return this&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;   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;         */&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;   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;        public Builder eventLoopGroup(final EventLoopGroup eventLoopGroup) {&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;   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;            this.eventLoopGroup = notNull(&quot;eventLoopGroup&quot;, eventLoopGroup);&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;   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;            return this;&lt;/span&gt;&lt;/pre&gt;
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					&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;        }&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;

</comment>
                            <comment id="2165291" author="smfitts@gmail.com" created="Wed, 27 Feb 2019 21:01:17 +0000"  >&lt;p&gt;Actually in the purely default case where you call &quot;NettyStreamFactoryFactory.builder().build()&quot; the event loop group is created by code in the driver (line 153 of NettyStreamFactoryFactory.java).&#160; So there really isn&apos;t any indication that the caller needs to do lifecycle management of what appears to be an internal implementation detail of the default factory.&#160; It would seem that in this case the factory should also have a way to install the necessary clean up handler.&lt;/p&gt;</comment>
                            <comment id="2165264" author="jeff.yemin" created="Wed, 27 Feb 2019 20:48:16 +0000"  >&lt;p&gt;Yes, that&apos;s true.  Since the application is now supplying the &lt;tt&gt;EventLoopGroup&lt;/tt&gt; (to NettyStreamFactoryFactory.Builder#eventLoopGroup}}, then the application is responsible for its life cycle and must decide when to close it.&lt;/p&gt;

&lt;p&gt;Let me know if I&apos;m misunderstanding you.&lt;/p&gt;</comment>
                            <comment id="2165141" author="smfitts@gmail.com" created="Wed, 27 Feb 2019 19:42:15 +0000"  >&lt;p&gt;With the most recent async/reactive streams driver (3.10.x) this appears to have resurfaced.&#160; If you use the non-deprecated mechanisms for setting the stream factory (MongoClientSettings.Builder.streamFactoryFactory) and you set it to use the NettyStreamFactoryFactory, then the code added to fix this bug is not executed.&#160; In this case the requestedStreamType is null in&#160;com.mongodb.async.client.MonogClients.create (the private version) and so the &quot;externalResourceCloser&quot; that was added to close the eventloop group is never set.&lt;/p&gt;

&lt;p&gt;As a result you can still leak event groups.&lt;/p&gt;</comment>
                            <comment id="1400022" author="xgen-internal-githook" created="Tue, 4 Oct 2016 18:57:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jyemin&apos;, u&apos;name&apos;: u&apos;Jeff Yemin&apos;, u&apos;email&apos;: u&apos;jeff.yemin@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/JAVA-2053&quot; title=&quot;Default NioEventLoopGroup created by driver must be closed&quot; class=&quot;issue-link&quot; data-issue-key=&quot;JAVA-2053&quot;&gt;&lt;del&gt;JAVA-2053&lt;/del&gt;&lt;/a&gt;: When no stream factory factory is provided, ensure that any EventLoopGroup instances are shutdown cleanly&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-java-driver/commit/56a1ae0a134c1a25614b4303c4fd67b40a219d8a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-java-driver/commit/56a1ae0a134c1a25614b4303c4fd67b40a219d8a&lt;/a&gt;&lt;/p&gt;</comment>
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