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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-44634] Account for election down time when calculating majority committed lag</title>
                <link>https://jira.mongodb.org/browse/SERVER-44634</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;According to the findings in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41187&quot; title=&quot;Majority committed replication lag spikes after an election&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41187&quot;&gt;&lt;del&gt;SERVER-41187&lt;/del&gt;&lt;/a&gt;, there is a period of time after an election where the lastCommitted OpTime is still from the previous term, and the lastApplied OpTime on the primary is from the new term. The majority committed &quot;lag&quot; is overstated as a result, because it includes time during which the replica set is not accepting writes.&lt;br/&gt;
Calculations of majority committed lag should ideally exclude this down time.&lt;/p&gt;

&lt;p&gt;These are the percentile breakdowns of the first majority committed write after a new term across 4.0 and 4.2. The units are in seconds:&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="1002649">SERVER-44634</key>
            <summary>Account for election down time when calculating majority committed lag</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="daniel.gottlieb@mongodb.com">Daniel Gottlieb</assignee>
                                    <reporter username="maria.vankeulen@mongodb.com">Maria van Keulen</reporter>
                        <labels>
                    </labels>
                <created>Thu, 14 Nov 2019 16:57:20 +0000</created>
                <updated>Sun, 29 Oct 2023 22:14:55 +0000</updated>
                            <resolved>Fri, 12 Jun 2020 01:35:39 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="3206411" author="xgen-internal-githook" created="Fri, 12 Jun 2020 01:31:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Daniel Gottlieb&apos;, &apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;, &apos;username&apos;: &apos;dgottlieb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44634&quot; title=&quot;Account for election down time when calculating majority committed lag&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44634&quot;&gt;&lt;del&gt;SERVER-44634&lt;/del&gt;&lt;/a&gt;: Account for election downtime when flow control calculates majority committed lag.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/01f7c7a2e39c1c555347e23a28a7a6e8357ab5f2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/01f7c7a2e39c1c555347e23a28a7a6e8357ab5f2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2933411" author="connie.chen" created="Tue, 3 Mar 2020 22:44:24 +0000"  >&lt;p&gt;This ticket needs further investigation, moving back to open until the next sprint starts&lt;/p&gt;</comment>
                            <comment id="2541511" author="lingzhi.deng" created="Thu, 14 Nov 2019 21:06:02 +0000"  >&lt;p&gt;And &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=judah.schvimer&quot; class=&quot;user-hover&quot; rel=&quot;judah.schvimer&quot;&gt;judah.schvimer&lt;/a&gt; pointed out that this only works if the lastCommitted lag is one term behind. And if there are multiple elections in between, we don&apos;t know the aggregate &quot;down time&quot; due to those elections. Though, having the lag across multiple term changes presumably happens a lot less. I guess the question is how precise we want to be v.s. the benefit we would get for the extra complexity.&lt;/p&gt;</comment>
                            <comment id="2541444" author="maria.vankeulen" created="Thu, 14 Nov 2019 20:28:50 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ldeng&quot; class=&quot;user-hover&quot; rel=&quot;ldeng&quot;&gt;ldeng&lt;/a&gt; proposed a solution to this issue where we approximate the &quot;down time&quot; of the replica set by determining the difference between the catch-up point of the new primary and the first OpTime of its new term. Majority committed lag calculations would subtract this difference from the calculation to avoid overstating the lag. Since we are interested in wall clock time lag, we would need to store the wall clock time corresponding to the first OpTime of the term in memory, and also store the wall clock time of the catch-up point.&lt;/p&gt;</comment>
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