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<channel>
    <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-975] Move Caching of Connection Pools out of MongoServer.</title>
                <link>https://jira.mongodb.org/browse/CSHARP-975</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;Currently, MongoServer caches connection pools. As MongoServer is continued Legacy API, we need to move caching elsewhere.&lt;/p&gt;</description>
                <environment></environment>
        <key id="137656">CSHARP-975</key>
            <summary>Move Caching of Connection Pools out of MongoServer.</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="robert@mongodb.com">Robert Stam</assignee>
                                    <reporter username="craig.wilson@mongodb.com">Craig Wilson</reporter>
                        <labels>
                    </labels>
                <created>Thu, 22 May 2014 12:37:27 +0000</created>
                <updated>Thu, 2 Apr 2015 18:05:56 +0000</updated>
                            <resolved>Tue, 19 Aug 2014 14:57:00 +0000</resolved>
                                                    <fixVersion>2.0</fixVersion>
                                    <component>API</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="711664" author="rstam" created="Thu, 4 Sep 2014 17:43:12 +0000"  >&lt;p&gt;Remember that if GetOrAdd is called by multiple threads the valueFactory may be called more than once.&lt;/p&gt;

&lt;p&gt;When this happens, only one of the values will get added to the concurrent dictionary, and the extra ones get garbage collected. This is really only viable when it doesn&apos;t matter if a few extra redundant copies of the value get created.&lt;/p&gt;

&lt;p&gt;With a resource like a Cluster we want to make sure that only one Cluster is created, so a simple lock statement achieves our goals better here.&lt;/p&gt;</comment>
                            <comment id="711613" author="sallgeud" created="Thu, 4 Sep 2014 16:55:15 +0000"  >&lt;p&gt;I suppose you could just go straight at ConcurrentDictionary in your case. I checked our end and we always use ConcurrentDictionary in these cases, instead of the double lock check.  Our double lock checking was only for some other thread-safe caching we&apos;re doing.&lt;/p&gt;

&lt;p&gt;Jon Skeet&apos;s answer on the question suggests either keep it exactly as is or let ConcurrentDictionary do it all for you and have it be even simpler: &lt;a href=&quot;http://stackoverflow.com/questions/6018768/double-checked-locking-on-dictionary-containskey&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://stackoverflow.com/questions/6018768/double-checked-locking-on-dictionary-containskey&lt;/a&gt;&lt;/p&gt;

&lt;p/&gt;
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				&lt;p style=&quot;margin: 5px 10px; padding: 0;&quot;&gt;Very Simple Version&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;   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;private readonly _registry = ConcurrentDictionary&amp;lt;ClusterKey, ICluster&amp;gt;()&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;&amp;nbsp;&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;private ICluster GetOrCreateCluster(ClusterKey clusterKey)&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;    return _registry.GetOrAdd(clusterKey, () =&amp;gt; CreateCluster(clusterKey));&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="711163" author="sallgeud" created="Thu, 4 Sep 2014 02:48:40 +0000"  >&lt;p&gt;We certainly only use the concurrent variety of collections, when concurrency is even possibly threaded. However, a quick look at some examples of stuff that use mongo seems to show that on most, each web request is likely to create a new client. However, I highly doubt most would be doing enough requests to make it matter, except in the case of APIs. &lt;/p&gt;

&lt;p&gt;Either way, we typically use this methodology on all locks with significant performance gains.&lt;/p&gt;

&lt;p&gt;We&apos;d be happy to do a comparison test once v2 is done. Simplicity is nice, too. &lt;/p&gt;</comment>
                            <comment id="711156" author="rstam" created="Thu, 4 Sep 2014 02:28:45 +0000"  >&lt;p&gt;Thanks for the comment. I&apos;ve been thinking about it, and I don&apos;t think the proposed alternative is thread safe. A Dictionary can only be safely shared among multiple reader threads as long as no other thread is modifying the dictionary at the same time. That means that even reads have to be protected.&lt;/p&gt;

&lt;p&gt;Switching to a ConcurrentDictionary is certainly a possibility, but keep in mind that this lock is not a likely candidate for contention, so keeping things as dead simple as possible also has merit. This lock would only come into play when a new MongoClient is instantiated, and many applications create a single MongoClient and use it for the lifetime of the application. Even if the application created many new MongoClient instances, this lock would only be held just long enough to lookup the cluster instance in the registry dictionary, which would be very fast, and has almost no chance of resulting in lock contention.&lt;/p&gt;</comment>
                            <comment id="711080" author="sallgeud" created="Wed, 3 Sep 2014 23:20:33 +0000"  >&lt;p&gt;Just a quick performance pattern note on a lock we saw:&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;
		&lt;thead&gt;
			&lt;tr id=&quot;syntaxplugin_title&quot;&gt;
			&lt;td bgcolor=&quot;#f5f5f5&quot; style=&quot;font-family: Arial,sans-serif; color: #333; border-bottom: 1px solid #bbb; background-color: #f5f5f5 !important; font-weight: bold; line-height: 1em;&quot; &gt;
				&lt;p style=&quot;margin: 5px 10px; padding: 0;&quot;&gt;Old&lt;/p&gt;
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			&lt;/thead&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;            lock (_lock)&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;                ICluster cluster;&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;                if (!_registry.TryGetValue(clusterKey, out cluster))&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;                    cluster = CreateCluster(clusterKey);&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;                    _registry.Add(clusterKey, cluster);&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;                return cluster;&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;p/&gt;

&lt;p&gt;If you can safely assume that the Get will at least occasionally return the cluster value, the following would be substantially faster and avoid an unnecessary lock &lt;span class=&quot;error&quot;&gt;&amp;#91;possibly more important than speed&amp;#93;&lt;/span&gt;.  You could also consider using a ConcurrentDictionary, which is threadsafe.&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;
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				&lt;p style=&quot;margin: 5px 10px; padding: 0;&quot;&gt;New&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;   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;            ICluster cluster;&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;            if (!_registry.TryGetValue(clusterKey, out cluster))&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;                lock(_lock)&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;                     // check again in case a multi-threaded app has been the first to set it in previous locks&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;                    if (!_registry.TryGetValue(clusterKey, out cluster))&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;                        cluster = CreateCluster(clusterKey);&lt;/span&gt;&lt;/pre&gt;
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		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;                        _registry.Add(clusterKey, cluster);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;           return cluster;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="695303" author="xgen-internal-githook" created="Tue, 19 Aug 2014 14:56:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;name&apos;: u&apos;rstam&apos;, u&apos;email&apos;: u&apos;robert@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-975&quot; title=&quot;Move Caching of Connection Pools out of MongoServer.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-975&quot;&gt;&lt;del&gt;CSHARP-975&lt;/del&gt;&lt;/a&gt;: Added tests.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/commit/1a2ea42b4a5d30a122911d100d60186d53e241b5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/commit/1a2ea42b4a5d30a122911d100d60186d53e241b5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="695301" author="xgen-internal-githook" created="Tue, 19 Aug 2014 14:56:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;name&apos;: u&apos;rstam&apos;, u&apos;email&apos;: u&apos;robert@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-975&quot; title=&quot;Move Caching of Connection Pools out of MongoServer.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-975&quot;&gt;&lt;del&gt;CSHARP-975&lt;/del&gt;&lt;/a&gt;: Move caching of connection pools out of MongoServer.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/commit/eed6cfadf0d65e9f36f4157922583d7b1335cad4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/commit/eed6cfadf0d65e9f36f4157922583d7b1335cad4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="647067" author="craiggwilson" created="Thu, 3 Jul 2014 12:31:34 +0000"  >&lt;p&gt;Where is lower than MongoClient? I mean, there has to be a hook somewhere to say, GetOrCreateCluster. I&apos;d imagine that place exists probably in a ClusterCache, but that cluster cache is likely invoked from MongoClient.  Regardless, the point of this is that it needs to be pulled out of MongoServer. I&apos;ll update the ticket title.&lt;/p&gt;</comment>
                            <comment id="646784" author="rstam" created="Thu, 3 Jul 2014 03:47:40 +0000"  >&lt;p&gt;We probably want to cache clusters (and therefore indirectly one or more connection pools) at a lower level than MongoClient.&lt;/p&gt;

&lt;p&gt;Currently MongoClient instances with different settings result in multiple connection pools being created, even if the settings differ only in ways that have nothing to do with the connections (e.g. ReadPreference).&lt;/p&gt;

&lt;p&gt;There is work ongoing in &lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-875&quot; title=&quot;Reimplement legacy API on top of New Core&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-875&quot;&gt;&lt;del&gt;CSHARP-875&lt;/del&gt;&lt;/a&gt; related to this as well.&lt;/p&gt;</comment>
                    </comments>
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