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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>[SERVER-9022] Enable mongos mode which releases ShardConnections to the pool after read ops</title>
                <link>https://jira.mongodb.org/browse/SERVER-9022</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Create a new serverParameter for mongos, &quot;releaseConnectionsAfterResponse,&quot; which enables returning ShardConnections from the per-socket pool to the global pool after each read operation.  This should reduce the total number of outgoing mongos connections to each shard.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Warning:&lt;/b&gt; Enabling this option on mongos comes with the caveat that clients can only call getLastError immediately after an actual write operation.  This is fine for the vast majority of use cases.  However, if an application does:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;write op (no GLE)&lt;/li&gt;
	&lt;li&gt;read op&lt;/li&gt;
	&lt;li&gt;GLE w=2 &#8212; this will not provide any semantic guarantees (and may in fact return an unrelated error)&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;If your application only ever calls GLE immediately after an actual write op (which is the same as using safe mode), this option will provide a good bit of multiplexing.&lt;/p&gt;

&lt;p&gt;The behavior is off by default.  To turn the behavior on (and off) a running mongos, use the standard setParameter framework - &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;tbody &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-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;mongo &amp;lt;mongos&amp;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;&amp;gt; use admin&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;&amp;gt; db.runCommand({ setParameter : 1, releaseConnectionsAfterResponse : true })&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;{ was : false, ok : true }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;To turn the behavior on at startup in a 2.4 mongos (this is not available before 2.4), you can also use:&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;tbody &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-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;shell&amp;gt; mongos --setParameter &quot;releaseConnectionsAfterResponse=true&quot; --configdb ...&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="68991">SERVER-9022</key>
            <summary>Enable mongos mode which releases ShardConnections to the pool after read ops</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="greg_10gen">Greg Studer</assignee>
                                    <reporter username="dan@mongodb.com">Daniel Pasette</reporter>
                        <labels>
                    </labels>
                <created>Tue, 19 Mar 2013 16:19:58 +0000</created>
                <updated>Tue, 27 Oct 2015 14:49:54 +0000</updated>
                            <resolved>Wed, 20 Mar 2013 21:33:30 +0000</resolved>
                                                    <fixVersion>2.2.4</fixVersion>
                    <fixVersion>2.4.2</fixVersion>
                    <fixVersion>2.5.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="295330" author="auto" created="Thu, 21 Mar 2013 22:06:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-03-21T22:03:39Z&apos;, u&apos;name&apos;: u&apos;Dan Pasette&apos;, u&apos;email&apos;: u&apos;dan@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9022&quot; title=&quot;Enable mongos mode which releases ShardConnections to the pool after read ops&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9022&quot;&gt;&lt;del&gt;SERVER-9022&lt;/del&gt;&lt;/a&gt;: command line option for releaseConnectionsAfterResponse&lt;br/&gt;
Branch: v2.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5d5fe49dfb5f452832b9d44fddbfb2a4e8b42f2a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5d5fe49dfb5f452832b9d44fddbfb2a4e8b42f2a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="294296" author="auto" created="Wed, 20 Mar 2013 21:07:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-03-20T16:54:47Z&apos;, u&apos;name&apos;: u&apos;Greg Studer&apos;, u&apos;email&apos;: u&apos;greg@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9022&quot; title=&quot;Enable mongos mode which releases ShardConnections to the pool after read ops&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9022&quot;&gt;&lt;del&gt;SERVER-9022&lt;/del&gt;&lt;/a&gt; allow releasing sharded conn back to pool after read operation&lt;br/&gt;
Branch: v2.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/74323d671a216c8c87fcb295ed743f830d5212ee&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/74323d671a216c8c87fcb295ed743f830d5212ee&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="293089" author="greg_10gen" created="Tue, 19 Mar 2013 16:25:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-03-14T19:03:03Z&apos;, u&apos;name&apos;: u&apos;Greg Studer&apos;, u&apos;email&apos;: u&apos;greg@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6991&quot; title=&quot;Add pool stats for ShardedConnection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6991&quot;&gt;&lt;del&gt;SERVER-6991&lt;/del&gt;&lt;/a&gt; allow releasing sharded conn back to pool after read operation&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/706459a8af0b278609d70e7122595243df6aeee8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/706459a8af0b278609d70e7122595243df6aeee8&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="70521">DOCS-1326</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                            <outwardlinks description="duplicates">
                                        <issuelink>
            <issuekey id="62526">SERVER-8224</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="12973">SERVER-1714</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="69261">SERVER-9055</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="50197">SERVER-7008</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="50111">SERVER-6991</issuekey>
        </issuelink>
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