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    <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-15387] Replica-set fails to elect primary after asymmetric network split blips</title>
                <link>https://jira.mongodb.org/browse/SERVER-15387</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In certain scenarios, the replica-set with priorities can end up in a state where a PRIMARY cannot be elected anymore until some election causing event occurs.&lt;/p&gt;

&lt;p&gt;i.e. for data nodes A, B C and arbiter D, E (B &amp;amp; D being on same machine). Following sequence of events caused this to occur:&lt;/p&gt;

&lt;p&gt;Priority = 1 for A, C&lt;br/&gt;
Priority = 0.5 for B&lt;/p&gt;


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&lt;th class=&apos;confluenceTh&apos;&gt; A-State &lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; B-State &lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; C-State &lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; Comments &lt;/th&gt;
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&lt;td class=&apos;confluenceTd&apos;&gt; Primary &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Secondary &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Secondary &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&amp;nbsp;&lt;/td&gt;
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&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; T + 1 &lt;/th&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Not Reachable &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Primary &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Not Reachable &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; &apos;A&apos; and &apos;C&apos; not reachable from &apos;E&apos;-Arb, &apos;B&apos; selected Primary &lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; T + 2 &lt;/th&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Recovering &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Secondary &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Secondary &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&amp;nbsp;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; T + 3 &lt;/th&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Primary &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Secondary &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Secondary &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; &apos;B&apos;p stepped down because of lower priority, &apos;E&apos;-Arb not able to see any primary &lt;/td&gt;
&lt;/tr&gt;
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&lt;th class=&apos;confluenceTh&apos;&gt; T + 4 &lt;/th&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Not Reachable &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Secondary &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Not Reachable &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; &apos;A&apos;, &apos;C&apos; not reachable from &apos;B&apos; and &apos;B&apos;-Arb &lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; T + 5 &lt;/th&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Not Reachable &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Primary &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Not Reachable &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; &apos;B&apos; elected Primary, since it was not reachable from &apos;B&apos;, &apos;D&apos;-Arb, &apos;E&apos;-Arb &lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; T + 6 &lt;/th&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Secondary &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Primary &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Secondary &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; &apos;A&apos; relinqueshed Primary since &apos;B&apos; was more recently elected Primary, &apos;A&apos; syncing to &apos;C&apos; &lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; T + 7 &lt;/th&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Rollback &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Primary &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Secondary &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&amp;nbsp;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; T + 8 &lt;/th&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Recovering &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Secondary &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Secondary &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; &apos;A&apos; while still Recovering steps downs &apos;B&apos; that has lower priority and is only 4 seconds ahead of &apos;C&apos; &lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; T + 9 &lt;/th&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Secondary &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Secondary &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Secondary &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; &apos;A&apos;, &apos;C&apos; not electing because they are not freshest which implies very likely &apos;B&apos; has the latest optime (since no rollback was seen when it was stepped down by &apos;A&apos;). &apos;B&apos; does not elect itself saying &apos;E&apos;-Arb will veto for lower priority. &apos;B&apos; is ahead by a few seconds of &apos;C&apos; &lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; T + XX &lt;/th&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Down &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Secondary &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Primary &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Shutting down &apos;A&apos; causes sync target change for &apos;C&apos; / rollback followed by a fresh election in the replica-set &lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
&lt;/div&gt;
</description>
                <environment></environment>
        <key id="160070">SERVER-15387</key>
            <summary>Replica-set fails to elect primary after asymmetric network split blips</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="5">Cannot Reproduce</resolution>
                                        <assignee username="matt.dannenberg">Matt Dannenberg</assignee>
                                    <reporter username="anil.kumar">Anil Kumar</reporter>
                        <labels>
                            <label>elections</label>
                    </labels>
                <created>Wed, 24 Sep 2014 21:46:06 +0000</created>
                <updated>Wed, 18 Feb 2015 21:27:38 +0000</updated>
                            <resolved>Wed, 18 Feb 2015 20:55:03 +0000</resolved>
                                    <version>2.6.3</version>
                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="832131" author="mattd@10gen.com" created="Wed, 18 Feb 2015 20:55:03 +0000"  >&lt;p&gt;Without the missing pieces of information, we are having difficulty drawing any conclusions or reproducing this.&lt;/p&gt;

&lt;p&gt;Feel free to reopen the ticket if this occurs again or the missing information is discovered.&lt;/p&gt;</comment>
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