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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-54454] Use same connection pool for heartbeats and oplog fetching	</title>
                <link>https://jira.mongodb.org/browse/SERVER-54454</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Using different ones leaves us open to a case where one pool exhausts its connections and the other does not. It also probably creates more connections than we need.&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/90e4270e9b22071c7d0367195c56bf2c5b50e56f/src/mongo/db/repl/replication_coordinator_external_state_impl.cpp#L335&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Oplog fetching&lt;/a&gt;, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/674d57fc70d80dedbfd634ce00ca4b967ea89646/src/mongo/db/mongod_main.cpp#L944&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;heartbeats&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1619951">SERVER-54454</key>
            <summary>Use same connection pool for heartbeats and oplog fetching	</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="judah.schvimer@mongodb.com">Judah Schvimer</reporter>
                        <labels>
                            <label>former-quick-wins</label>
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                <created>Wed, 10 Feb 2021 20:58:35 +0000</created>
                <updated>Mon, 10 Apr 2023 18:57:22 +0000</updated>
                                                                            <component>Networking</component>
                    <component>Replication</component>
                                        <votes>2</votes>
                                    <watches>16</watches>
                                                                                                                <comments>
                            <comment id="3852644" author="schwerin" created="Tue, 1 Jun 2021 22:11:18 +0000"  >&lt;p&gt;I think there are two routes to achieving this goal. (1) is the ticket&apos;s suggested solution, using the same connection pool for heartbeats and oplog fetching. Since we&apos;re primarily concerned with heartbeats failing when oplog fetching has begun to fail, we could either (1a) use the same pool, or (1b) have the DBClient used for oplog fetching remove a working connection from the pool used by heartbeating. (2) When oplog fetching has failed to establish a connection to the upstream node successfully, it could flush all connections out of the connection pool used for heartbeats, so that the next heartbeat will be required to establish a new connection.&lt;/p&gt;</comment>
                            <comment id="3610346" author="judah.schvimer" created="Wed, 10 Feb 2021 21:37:28 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dmitry.agranat&quot; class=&quot;user-hover&quot; rel=&quot;dmitry.agranat&quot;&gt;dmitry.agranat&lt;/a&gt; would like to backport this to 4.0, which we should consider after implementation. If the backport is too difficult, or if we are not going to do this ticket soon, we should update the arch guide with a warning that there are two connection pools.&lt;/p&gt;</comment>
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