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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-10904] Possible for _master and _slaveConn to be pointing to different connections even with primary read pref</title>
                <link>https://jira.mongodb.org/browse/SERVER-10904</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There is a potential bug in DBClientReplicaSet that would cause _lastSlaveOkConn and _master to be different even if readPref was set to primary. This is plausible in theory since _lastSlaveOkConn and _master are simply shared pointers, so _master and _lastSlaveConn in theory can point to different instances. Currently, I can&apos;t find a way to make this happen, but it is plausible since whenever we clear the pointer on the _master, we don&apos;t do it on _lastSlaveConn and vice versa.&lt;/p&gt;

&lt;p&gt;One observed behavior from a user is that connection used to send setShardVersion is different from the actual connection that sends the query, and thus goes into this loop where the shard rejects because the version is wrong and mongos retries with the right setShardVersion (but on the wrong connection) until it reaches the maximum retries.&lt;/p&gt;</description>
                <environment></environment>
        <key id="91521">SERVER-10904</key>
            <summary>Possible for _master and _slaveConn to be pointing to different connections even with primary read pref</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="9">Done</resolution>
                                        <assignee username="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Wed, 25 Sep 2013 18:04:01 +0000</created>
                <updated>Thu, 16 Apr 2015 15:25:00 +0000</updated>
                            <resolved>Tue, 10 Feb 2015 20:25:53 +0000</resolved>
                                    <version>2.2.4</version>
                    <version>2.4.12</version>
                    <version>2.6.5</version>
                                    <fixVersion>2.6.8</fixVersion>
                                    <component>Internal Client</component>
                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="826179" author="xgen-internal-githook" created="Tue, 10 Feb 2015 20:25:21 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;renctan&apos;, u&apos;name&apos;: u&apos;Randolph Tan&apos;, u&apos;email&apos;: u&apos;randolph@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-10904&quot; title=&quot;Possible for _master and _slaveConn to be pointing to different connections even with primary read pref&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-10904&quot;&gt;&lt;del&gt;SERVER-10904&lt;/del&gt;&lt;/a&gt; Possible for _master and _slaveConn to be pointing to different connections&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/224067d03b7631d4c984fe99cccda3a0d2f6874c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/224067d03b7631d4c984fe99cccda3a0d2f6874c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="787647" author="alex.komyagin@10gen.com" created="Tue, 16 Dec 2014 22:01:52 +0000"  >&lt;p&gt;Reopening as per my conversation with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=renctan&quot; class=&quot;user-hover&quot; rel=&quot;renctan&quot;&gt;renctan&lt;/a&gt;. We agreed that it makes sense to at least put some invariants around the involved code - it should allow for further progress in the event of reoccurrence.&lt;/p&gt;</comment>
                            <comment id="678907" author="renctan" created="Fri, 1 Aug 2014 17:17:32 +0000"  >&lt;p&gt;Note: Only the changes for 2.7.x in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9788&quot; title=&quot;mongos does not re-evaluate read preference once a valid replica set member is chosen&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9788&quot;&gt;&lt;del&gt;SERVER-9788&lt;/del&gt;&lt;/a&gt; makes this impossible. The fix for v2.6 does not fix this problem.&lt;/p&gt;</comment>
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