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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-19704] Store the current term in persistent storage</title>
                <link>https://jira.mongodb.org/browse/SERVER-19704</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;New election protocol requires storing the current term (latest term server has seen) and the voted candidate id when updating the term. We&apos;ll use candidate index to avoid negative _id. Thus, candidate index == -1 means we haven&apos;t voted for the current term.&lt;/p&gt;</description>
                <environment></environment>
        <key id="223690">SERVER-19704</key>
            <summary>Store the current term in persistent storage</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="9">Done</resolution>
                                        <assignee username="siyuan.zhou@mongodb.com">Siyuan Zhou</assignee>
                                    <reporter username="siyuan.zhou@mongodb.com">Siyuan Zhou</reporter>
                        <labels>
                    </labels>
                <created>Fri, 31 Jul 2015 21:21:35 +0000</created>
                <updated>Wed, 5 Aug 2015 14:16:08 +0000</updated>
                            <resolved>Mon, 3 Aug 2015 20:51:22 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="995452" author="siyuan.zhou@10gen.com" created="Mon, 3 Aug 2015 20:44:29 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=milkie&quot; class=&quot;user-hover&quot; rel=&quot;milkie&quot;&gt;milkie&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19738&quot; title=&quot;Restore current term at startup&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19738&quot;&gt;&lt;del&gt;SERVER-19738&lt;/del&gt;&lt;/a&gt; has been filed to track the new design. Shall I close this one?&lt;/p&gt;</comment>
                            <comment id="995262" author="siyuan.zhou@10gen.com" created="Mon, 3 Aug 2015 18:42:29 +0000"  >&lt;p&gt;Discussed with Eric in person, we think it&apos;s OK to restore the startup term from the last entry in oplog and the last vote document, whichever is greater. Thus we can save a database write whenever a secondary learns a new term.&lt;/p&gt;

&lt;p&gt;The term in the last oplog entry guarantees that the terms in oplog never go backwards. The last vote&apos;s term guarantees that a stale primary won&apos;t commit an operation on the majority once a new primary wins an election, even if some nodes (including voters of the new primary) restart at the meantime. Terms on the minority secondaries that didn&apos;t participate the last vote may go backwards for a short time after a restart, but it should be harmless.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=schwerin&quot; class=&quot;user-hover&quot; rel=&quot;schwerin&quot;&gt;schwerin&lt;/a&gt;, I used to plan to change LastVote to ElectionState, which is the last vote if the node participated the latest vote, or the latest term with an empty candidate if it learned the term from others, meaning it hasn&apos;t voted anyone for that term.&lt;/p&gt;</comment>
                            <comment id="994654" author="milkie" created="Sun, 2 Aug 2015 22:56:45 +0000"  >&lt;p&gt;I needed the weekend to think about this. I think this is not necessary to do. instead, the election no-op &apos;n&apos; op will dictate the correct term to start in, if there aren&apos;t any other ops in the current term. &lt;br/&gt;
This came up for one-node replica sets that go right to state Primary, it wasn&apos;t choosing the correct startup term. &lt;/p&gt;</comment>
                            <comment id="994633" author="schwerin" created="Sun, 2 Aug 2015 20:36:10 +0000"  >&lt;p&gt;Where will the information be stored?&lt;/p&gt;</comment>
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            <issuekey id="223935">SERVER-19738</issuekey>
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