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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-46907] Speed up config replication acknowledgement</title>
                <link>https://jira.mongodb.org/browse/SERVER-46907</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A series of safe replica set reconfigs must pause an unnecessary 2 seconds (a heartbeat interval) between reconfigs. The primary that receives the replSetReconfig command takes around 2 seconds to receive acknowledgement from a majority of members that they have replicated the new config. After storing a new config, the primary immediately sends a new round of heartbeat requests to all members, and these secondaries immediately fetch and install the new config upon seeing the newer configVersion. The primary, however, will only satisfy the config replication check once it has learned about the newly installed configs via heartbeat responses. Therefore, since it will take 2 seconds for the primary to send out another round of heartbeat requests after itself and other secondaries have installed the new config, it will take ~2 seconds to satisfy the config replication check. Ideally this unnecessary waiting can be eliminated.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1276961">SERVER-46907</key>
            <summary>Speed up config replication acknowledgement</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="13201">Fixed</resolution>
                                        <assignee username="matt.broadstone@mongodb.com">Matt Broadstone</assignee>
                                    <reporter username="jesse@mongodb.com">A. Jesse Jiryu Davis</reporter>
                        <labels>
                            <label>former-quick-wins</label>
                            <label>safe-reconfig-related</label>
                    </labels>
                <created>Tue, 17 Mar 2020 02:49:49 +0000</created>
                <updated>Sun, 29 Oct 2023 22:10:42 +0000</updated>
                            <resolved>Wed, 25 May 2022 22:28:48 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="4573778" author="xgen-internal-githook" created="Wed, 25 May 2022 22:27:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matt Broadstone&apos;, &apos;email&apos;: &apos;mbroadst@mongodb.com&apos;, &apos;username&apos;: &apos;mbroadst&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46907&quot; title=&quot;Speed up config replication acknowledgement&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46907&quot;&gt;&lt;del&gt;SERVER-46907&lt;/del&gt;&lt;/a&gt; Speed up reconfig replication acknowledgement&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/25c8241437807544cd15d520a702b092146f4ace&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/25c8241437807544cd15d520a702b092146f4ace&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3027787" author="judah.schvimer" created="Mon, 6 Apr 2020 17:29:05 +0000"  >&lt;p&gt;We will address this if users complain about it.&lt;/p&gt;</comment>
                            <comment id="2984028" author="siyuan.zhou@10gen.com" created="Tue, 17 Mar 2020 20:02:48 +0000"  >&lt;p&gt;Agreed this is a valuable improvement. This can be solved by updating the config version/term of other nodes on learning heartbeat requests from them rather than just relying on heartbeat responses as mentioned by &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=william.schultz&quot; class=&quot;user-hover&quot; rel=&quot;william.schultz&quot;&gt;william.schultz&lt;/a&gt;. If I remembered correctly, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jesse&quot; class=&quot;user-hover&quot; rel=&quot;jesse&quot;&gt;jesse&lt;/a&gt; proposed to shorten the heartbeat intervals temporarily on primary as an alternative.&lt;/p&gt;</comment>
                            <comment id="2983130" author="judah.schvimer" created="Tue, 17 Mar 2020 14:24:13 +0000"  >&lt;p&gt;This seems like a very valuable perf improvement, especially since I expect we experience this in our tests a lot. &lt;/p&gt;</comment>
                            <comment id="2982656" author="william.schultz" created="Tue, 17 Mar 2020 03:22:52 +0000"  >&lt;p&gt;As I understand it, the primary must &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7a94d2e51c709438aa2a65ac08955182ccb8c724/src/mongo/db/repl/topology_coordinator.cpp#L932-L937&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;learn of the newly installed configs&lt;/a&gt; via heartbeat responses, not requests from other nodes. So, I believe the biggest delay is caused by the primary not sending out new heartbeat requests for ~2 seconds (a heartbeat interval) even after all nodes may have installed the config very quickly.&lt;/p&gt;</comment>
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            <issuekey id="1049572">SERVER-45095</issuekey>
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