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    <title>MongoDB Jira</title>
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    <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-10575] Two Primaries if Replica Set Heartbeats Fail in One Direction: &quot;Old&quot; Primary doesn&apos;t relinquish.</title>
                <link>https://jira.mongodb.org/browse/SERVER-10575</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Because of &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r2.4.5/src/mongo/db/repl/manager.cpp#L84&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this line&lt;/a&gt;, it&apos;s possible for two primaries to exist simultaneously if the &quot;old&quot; primary has an _id less than the &quot;new&quot; primary.  &quot;old&quot; primary will stay in PRIMARY state until restarted.&lt;/p&gt;</description>
                <environment>Three Node Replica Set (2 data bearing, 1 arbiter)</environment>
        <key id="86521">SERVER-10575</key>
            <summary>Two Primaries if Replica Set Heartbeats Fail in One Direction: &quot;Old&quot; Primary doesn&apos;t relinquish.</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="-1">Unassigned</assignee>
                                    <reporter username="stephen.lee">Stephen Lee</reporter>
                        <labels>
                    </labels>
                <created>Mon, 19 Aug 2013 18:07:53 +0000</created>
                <updated>Wed, 10 Dec 2014 23:06:03 +0000</updated>
                            <resolved>Wed, 19 Feb 2014 19:30:00 +0000</resolved>
                                    <version>2.4.5</version>
                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="501734" author="milkie" created="Wed, 19 Feb 2014 19:30:00 +0000"  >&lt;p&gt;Fix was committed in linked SERVER ticket for 2.6.0rc0&lt;/p&gt;</comment>
                            <comment id="501712" author="andreas.nilsson@10gen.com" created="Wed, 19 Feb 2014 19:02:57 +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; the issue &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sverch&quot; class=&quot;user-hover&quot; rel=&quot;sverch&quot;&gt;sverch&lt;/a&gt; describes above is very real since a replica set which is transitioned incorrectly to an inconsistent SSL state where the nodes cannot talk to each other will still return rs.status depicting a functioning set.&lt;/p&gt;

&lt;p&gt;One suggestion could be to change the state to unreachable if the bi-directional ping does start working over a couple of health poll cycles. That is after say 5 failed outgoing pings we will set the state to unreachable.&lt;/p&gt;

&lt;p&gt;Another option is simply to require the bidirectional ping to work.&lt;/p&gt;</comment>
                            <comment id="501700" author="sverch" created="Wed, 19 Feb 2014 18:55:45 +0000"  >&lt;p&gt;Another way to cause a heartbeat to fail in one direction is to use the &quot;sslMode&quot; parameter in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-11431&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-11431&lt;/a&gt; to upgrade a single node to &quot;requireSSL&quot; and leave the others as &quot;allowSSL&quot;.  The &quot;allowSSL&quot; nodes will not be able to connect to the &quot;requireSSL&quot; node, but the &quot;requireSSL&quot; node will be able to connect to the &quot;allowSSL&quot; node.&lt;/p&gt;</comment>
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            <issuekey id="76333">SERVER-9765</issuekey>
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                            <customfieldvalue>&lt;p&gt;1. Setup three node replica set (2 data bearing, 1 arbiter) and run &lt;tt&gt;mongod&lt;/tt&gt; with &apos;&lt;tt&gt;--maxConns 5&lt;/tt&gt;&apos;.&lt;br/&gt;
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