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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>[CXX-2394] Require hello command for connection handshake to use OP_MSG, disallowing OP_QUERY</title>
                <link>https://jira.mongodb.org/browse/CXX-2394</link>
                <project id="11980" key="CXX">C++ Driver</project>
                    <description>&lt;p&gt;This ticket was split from DRIVERS-1916, please see that ticket for a detailed description.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1902516">CXX-2394</key>
            <summary>Require hello command for connection handshake to use OP_MSG, disallowing OP_QUERY</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="ezra.chung@mongodb.com">Ezra Chung</assignee>
                                    <reporter username="dbeng-pm-bot">PM Bot</reporter>
                        <labels>
                            <label>size-xsmall</label>
                    </labels>
                <created>Tue, 19 Oct 2021 19:41:38 +0000</created>
                <updated>Sat, 28 Oct 2023 11:26:50 +0000</updated>
                            <resolved>Wed, 17 May 2023 16:38:58 +0000</resolved>
                                                    <fixVersion>3.8.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5432288" author="JIRAUSER1261413" created="Wed, 17 May 2023 16:39:32 +0000"  >&lt;p&gt;Commit: &lt;a href=&quot;https://github.com/mongodb/mongo-cxx-driver/commit/b9b8f948663f60cf1027cbc9d22eb9bd6554a587&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-cxx-driver/commit/b9b8f948663f60cf1027cbc9d22eb9bd6554a587&lt;/a&gt;&lt;br/&gt;
PR: &lt;a href=&quot;https://github.com/mongodb/mongo-cxx-driver/pull/962&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-cxx-driver/pull/962&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="1902515">CDRIVER-4193</issuekey>
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                        <customfieldname>Upstream Changes Summary</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>&lt;p&gt;DRIVERS-1916:&lt;br/&gt;
This ticket does two things:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;It clarifies that if the &quot;hello&quot; command is used (as opposed to &quot;isMaster&quot;) it must be sent using OP_MSG&lt;/li&gt;
	&lt;li&gt;Because &lt;a href=&quot;https://github.com/mongodb/specifications/blob/63b0451b4969f6bf7464e8d86d78b7552f65ba58/source/mongodb-handshake/handshake.rst#connection-handshake&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the previous version of the spec&lt;/a&gt; already required that if a versioned API is specified, &quot;hello&quot; must be used, it is made explicit that this also means OP_MSG must be used.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Drivers must ensure that their connection handshake uses both OP_MSG and &quot;hello&quot; if a versioned API is specified.&lt;br/&gt;
 For an example of what your connection process should look like after this change, take a look at the &lt;a href=&quot;https://github.com/mongodb/specifications/blob/master/source/mongodb-handshake/handshake.rst#connection-handshake&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Python implementation&lt;/a&gt; in the handshake spec.&lt;/p&gt;</customfieldvalue>

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