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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-31039] set minvalid term to -1 on pv1 downgrade</title>
                <link>https://jira.mongodb.org/browse/SERVER-31039</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When we upgrade to pv1 after previously downgrading, the node&apos;s term will be set to 0. If the term of minValid is greater than 0, we will not be able to find a sync source. Setting it to -1 on downgrade will avoid this.&lt;/p&gt;</description>
                <environment></environment>
        <key id="426264">SERVER-31039</key>
            <summary>set minvalid term to -1 on pv1 downgrade</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="3">Duplicate</resolution>
                                        <assignee username="siyuan.zhou@mongodb.com">Siyuan Zhou</assignee>
                                    <reporter username="judah.schvimer@mongodb.com">Judah Schvimer</reporter>
                        <labels>
                    </labels>
                <created>Mon, 11 Sep 2017 20:29:00 +0000</created>
                <updated>Thu, 26 Oct 2017 22:01:21 +0000</updated>
                            <resolved>Thu, 26 Oct 2017 22:01:03 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1710672" author="siyuan.zhou@10gen.com" created="Thu, 26 Oct 2017 22:01:03 +0000"  >&lt;p&gt;Marking this as a dup to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31002&quot; title=&quot;minValid should alway be set to existent OpTime&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31002&quot;&gt;&lt;del&gt;SERVER-31002&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1706872" author="siyuan.zhou@10gen.com" created="Tue, 24 Oct 2017 03:20:50 +0000"  >&lt;p&gt;After PV downgrade to PV0, the minValid will be set to something that never exists too, but the logic of choosing new sync source that &lt;a href=&quot;https://github.com/mongodb/mongo/blob/979ee612682b77d9cabaafae10787fbb578cd32a/src/mongo/db/repl/bgsync.cpp#L321&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;compares the last fetched optime and the minValid&lt;/a&gt; ignores the term if any one of them is -1, so the required optime isn&apos;t checked on the sync source. As a result, the problem rarely appears after PV downgrade unless the node is in an inconsistent state while choosing new sync source.&lt;/p&gt;

&lt;p&gt;If PV gets upgraded again, the last fetched optime has a valid term. Comparing it to a non-exist optime triggers this problem.&lt;/p&gt;</comment>
                            <comment id="1703859" author="judah.schvimer" created="Thu, 19 Oct 2017 16:01:36 +0000"  >&lt;p&gt;I uploaded Spencer&apos;s repro attached to HELP-4911. As far as I remember, we do need to backport it and it was not caused by changes in 3.6.&lt;/p&gt;</comment>
                            <comment id="1669857" author="judah.schvimer" created="Mon, 11 Sep 2017 21:29:18 +0000"  >&lt;p&gt;yes, my mistake.&lt;/p&gt;</comment>
                            <comment id="1669846" author="spencer" created="Mon, 11 Sep 2017 21:21:58 +0000"  >&lt;p&gt;Shouldn&apos;t this actually be done on protocolVersion downgrade?&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="425536">SERVER-31002</issuekey>
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            <issuekey id="425544">SERVER-31004</issuekey>
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                            <attachment id="168739" name="pvUpgradeDowngrade.js" size="2654" author="judah.schvimer@mongodb.com" created="Thu, 19 Oct 2017 16:00:47 +0000"/>
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