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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-45086] Record the last committed optime in the previous config on reconfig</title>
                <link>https://jira.mongodb.org/browse/SERVER-45086</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Record the last committed optime in the previous config. The optime should be updated on reconfig.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1049558">SERVER-45086</key>
            <summary>Record the last committed optime in the previous config on reconfig</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="william.schultz@mongodb.com">William Schultz</assignee>
                                    <reporter username="siyuan.zhou@mongodb.com">Siyuan Zhou</reporter>
                        <labels>
                            <label>safe-reconfig-cmd</label>
                    </labels>
                <created>Thu, 12 Dec 2019 05:37:08 +0000</created>
                <updated>Sun, 29 Oct 2023 22:14:10 +0000</updated>
                            <resolved>Tue, 21 Jan 2020 21:08:10 +0000</resolved>
                                                    <fixVersion>4.3.3</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2748333" author="xgen-internal-githook" created="Tue, 21 Jan 2020 21:02:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;will62794&apos;, &apos;name&apos;: &apos;William Schultz&apos;, &apos;email&apos;: &apos;william.schultz@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45086&quot; title=&quot;Record the last committed optime in the previous config on reconfig&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45086&quot;&gt;&lt;del&gt;SERVER-45086&lt;/del&gt;&lt;/a&gt; Record the last committed optime in the previous config on replication reconfig&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/80195b6a5c1e48dbffa6227002e6c89ec7a10e10&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/80195b6a5c1e48dbffa6227002e6c89ec7a10e10&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2733165" author="william.schultz" created="Wed, 15 Jan 2020 22:33:30 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=siyuan.zhou&quot; class=&quot;user-hover&quot; rel=&quot;siyuan.zhou&quot;&gt;siyuan.zhou&lt;/a&gt; Yes, it does. I just had to think about it for a bit to see how those two values would be combined into one. Thanks for clarifying! &lt;/p&gt;</comment>
                            <comment id="2733105" author="siyuan.zhou@10gen.com" created="Wed, 15 Jan 2020 22:29:44 +0000"  >&lt;p&gt;&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;, exactly! Does the proposal make sense to you?&lt;/p&gt;</comment>
                            <comment id="2732939" author="william.schultz" created="Wed, 15 Jan 2020 21:57:43 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=siyuan.zhou&quot; class=&quot;user-hover&quot; rel=&quot;siyuan.zhou&quot;&gt;siyuan.zhou&lt;/a&gt; I just wanted to clarify the meaning of &quot;allowed committed OpTime&quot; in the description. For checking the &lt;em&gt;Oplog Commitment&lt;/em&gt; condition we need to make sure that the last optime committed in the previous config (&lt;tt&gt;lastCommittedInPrevConfig&lt;/tt&gt;) is now committed in our current config. If the term of &lt;tt&gt;lastCommittedInPrevConfig&lt;/tt&gt; is not the same as our current term, then we will need to wait on &lt;tt&gt;firstOpTimeOfMyTerm&lt;/tt&gt; to be committed in our current config. If I understand your intention correctly, since the optime we wait on will be &lt;tt&gt;max(lastCommittedInPrevConfig, firstOpTimeOfMyTerm&lt;/tt&gt;), we could combine these two optimes into a single entity, and use that for checking the config oplog commitment condition in addition to checking that we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/319757ebb72611fb91044a2a81d1b77a6f3729c1/src/mongo/db/repl/topology_coordinator.cpp#L2470&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;do not commit an op&lt;/a&gt; before we have committed something in our own term. Does that align with your thinking?&lt;/p&gt;</comment>
                    </comments>
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                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="1049559">SERVER-45087</issuekey>
        </issuelink>
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