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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-44455] Fix handling of protocol version on reconnect in DBClient</title>
                <link>https://jira.mongodb.org/browse/SERVER-44455</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We currently temporarily switch the client to &quot;kOpQueryOnly&quot; protocol when we connect, to force the OP_QUERY protocol to be used.  After connecting, we switch our view of what the server accepts to match the wire protocol version in the server, which for all modern versions of mongodb is &quot;kOpMsgOnly&quot;.  When we reconnect, then, we attempt to do an isMaster command with a &quot;kOpQueryOnly&quot; client and what we believe is a &quot;kOpMsgOnly&quot; server; this fails.&lt;/p&gt;

&lt;p&gt;If on each connection we also reset our view of what the server is to the default &quot;kOpQueryOnly&quot;, we will get the same result (the first isMaster is done with OP_QUERY, later operations with whatever the server replies in the isMaster), and reconnection will work.&lt;/p&gt;</description>
                <environment></environment>
        <key id="991485">SERVER-44455</key>
            <summary>Fix handling of protocol version on reconnect in DBClient</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="13201">Fixed</resolution>
                                        <assignee username="matthew.russotto@mongodb.com">Matthew Russotto</assignee>
                                    <reporter username="matthew.russotto@mongodb.com">Matthew Russotto</reporter>
                        <labels>
                    </labels>
                <created>Wed, 6 Nov 2019 15:17:33 +0000</created>
                <updated>Sun, 29 Oct 2023 22:15:17 +0000</updated>
                            <resolved>Tue, 26 Nov 2019 21:19:09 +0000</resolved>
                                                    <fixVersion>4.3.3</fixVersion>
                                    <component>Internal Client</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2522777" author="xgen-internal-githook" created="Thu, 7 Nov 2019 18:00:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;mtrussotto&apos;, &apos;email&apos;: &apos;matthew.russotto@mongodb.com&apos;, &apos;name&apos;: &apos;Matthew Russotto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44455&quot; title=&quot;Fix handling of protocol version on reconnect in DBClient&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44455&quot;&gt;&lt;del&gt;SERVER-44455&lt;/del&gt;&lt;/a&gt; Fix handling of protocol version on reconnect in DBClient&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/74da85743816056b5b097b1e98b5e1b409790756&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/74da85743816056b5b097b1e98b5e1b409790756&lt;/a&gt;&lt;/p&gt;</comment>
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