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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-25006] Connection Pool ASIO must indicate use separately from non-error</title>
                <link>https://jira.mongodb.org/browse/SERVER-25006</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Connection Pool ASIO connects indications of success with indications of use, which causes the underlying connection pool to assume a connection is fresher than it may actually be (we said we did IO, but actually we just haven&apos;t caused an error).&lt;/p&gt;

&lt;p&gt;Because the connection pool it self checks connections out, marks them ok and then checks them back in to trigger a refresh, this causes connections to always seem fresh, never be heartbeated and never check against minConnections for dropping.  This will likely cause connections to stabilize at some high water mark, rather than dropping down to minConnections.&lt;/p&gt;</description>
                <environment></environment>
        <key id="300195">SERVER-25006</key>
            <summary>Connection Pool ASIO must indicate use separately from non-error</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="mira.carey@mongodb.com">Mira Carey</assignee>
                                    <reporter username="mira.carey@mongodb.com">Mira Carey</reporter>
                        <labels>
                            <label>code-and-test</label>
                    </labels>
                <created>Mon, 11 Jul 2016 23:02:06 +0000</created>
                <updated>Mon, 8 Jan 2024 15:23:14 +0000</updated>
                            <resolved>Fri, 15 Jul 2016 17:58:17 +0000</resolved>
                                    <version>3.2.7</version>
                                    <fixVersion>3.2.9</fixVersion>
                    <fixVersion>3.3.10</fixVersion>
                                    <component>Networking</component>
                                        <votes>1</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="1325953" author="xgen-internal-githook" created="Fri, 15 Jul 2016 22:02:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;hanumantmk&apos;, u&apos;name&apos;: u&apos;Jason Carey&apos;, u&apos;email&apos;: u&apos;jcarey@argv.me&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25006&quot; title=&quot;Connection Pool ASIO must indicate use separately from non-error&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25006&quot;&gt;&lt;del&gt;SERVER-25006&lt;/del&gt;&lt;/a&gt; asio indicateUsed != indicateSuccess&lt;/p&gt;

&lt;p&gt;Connection Pool ASIO connects indications of success with indications of use, which causes the&lt;br/&gt;
underlying connection pool to assume a connection is fresher than it may actually be (we said we did&lt;br/&gt;
IO, but actually we just haven&apos;t caused an error).&lt;/p&gt;

&lt;p&gt;Because the connection pool it self checks connections out, marks them ok and then checks them back&lt;br/&gt;
in to trigger a refresh, this causes connections to always seem fresh, never be heartbeated and&lt;br/&gt;
never check against minConnections for dropping.&lt;/p&gt;

&lt;p&gt;Change indicateSuccess to not also mean indicateUsed in conn pool asio and call indicateUsed where&lt;br/&gt;
needed manually in the one location where it&apos;s relevant.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit e39a2a87eaca8a573b8b1145cf520415904019f5)&lt;br/&gt;
Branch: v3.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/741d3086c7de16e6e11db058cb89b39981f2e569&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/741d3086c7de16e6e11db058cb89b39981f2e569&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1325594" author="xgen-internal-githook" created="Fri, 15 Jul 2016 17:57:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;hanumantmk&apos;, u&apos;name&apos;: u&apos;Jason Carey&apos;, u&apos;email&apos;: u&apos;jcarey@argv.me&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25006&quot; title=&quot;Connection Pool ASIO must indicate use separately from non-error&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25006&quot;&gt;&lt;del&gt;SERVER-25006&lt;/del&gt;&lt;/a&gt; asio indicateUsed != indicateSuccess&lt;/p&gt;

&lt;p&gt;Connection Pool ASIO connects indications of success with indications of use, which causes the&lt;br/&gt;
underlying connection pool to assume a connection is fresher than it may actually be (we said we did&lt;br/&gt;
IO, but actually we just haven&apos;t caused an error).&lt;/p&gt;

&lt;p&gt;Because the connection pool it self checks connections out, marks them ok and then checks them back&lt;br/&gt;
in to trigger a refresh, this causes connections to always seem fresh, never be heartbeated and&lt;br/&gt;
never check against minConnections for dropping.&lt;/p&gt;

&lt;p&gt;Change indicateSuccess to not also mean indicateUsed in conn pool asio and call indicateUsed where&lt;br/&gt;
needed manually in the one location where it&apos;s relevant.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e39a2a87eaca8a573b8b1145cf520415904019f5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e39a2a87eaca8a573b8b1145cf520415904019f5&lt;/a&gt;&lt;/p&gt;</comment>
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