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    <title>MongoDB Jira</title>
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    <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-42909] Replace ConnectionPool generations with sequence ids</title>
                <link>https://jira.mongodb.org/browse/SERVER-42909</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Right now we use a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/executor/connection_pool.cpp#L400&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;generation index&lt;/a&gt; to processFailure() for connection pooling. This has two unintended side effects in spurious networking conditions:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;A failed connection causes connections created after it to be considered failed as well. This could throw away good connections in situations with spurious failures.&lt;/li&gt;
	&lt;li&gt;A failed connection causes a connection request (and thus an operation) to receive a not okay status. This can happen even if the remote host has already failed the connection by the time the request came in.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;We should use either a monotonic sequence id or clock to mark each time a connection is considered &quot;ready&quot; (including initial creation). We should also attach these ids to requests. When a connection fails, all ids &lt;b&gt;before&lt;/b&gt; it should be considered failed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="900550">SERVER-42909</key>
            <summary>Replace ConnectionPool generations with sequence ids</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="ben.caimano@mongodb.com">Benjamin Caimano</reporter>
                        <labels>
                    </labels>
                <created>Mon, 19 Aug 2019 21:55:12 +0000</created>
                <updated>Tue, 6 Dec 2022 02:50:09 +0000</updated>
                            <resolved>Tue, 15 Oct 2019 17:11:29 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2378943" author="jason.carey" created="Tue, 20 Aug 2019 14:30:18 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ben.caimano&quot; class=&quot;user-hover&quot; rel=&quot;ben.caimano&quot;&gt;ben.caimano&lt;/a&gt; - I think this is more a bug with finishRefresh, rather than using a generation counter.  My original notion was that any connection which comes back in the wrong generation needs to be thrown away, which I think is identical to &amp;lt; _generation (because all new requests are in generation == latest, so != == &amp;lt;).  That&apos;s also the behavior of returnConnection (check if wrong generation before checking status).&lt;/p&gt;</comment>
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