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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>[CSHARP-3480] Switch to using maxWireVersion rather than buildInfo to determine feature support</title>
                <link>https://jira.mongodb.org/browse/CSHARP-3480</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;The .NET/C# Driver calls &lt;tt&gt;buildInfo&lt;/tt&gt; to determine the connected server&apos;s semantic version and then uses that information in &lt;tt&gt;src/MongoDB.Driver.Core/Core/Misc/Feature.cs&lt;/tt&gt; to determine whether a feature is supported. The Java Driver used to do this too but switched to &lt;tt&gt;maxWireVersion&lt;/tt&gt; from &lt;tt&gt;isMaster&lt;/tt&gt;/&lt;tt&gt;hello&lt;/tt&gt; to determine feature support in the 4.0 release of the Java driver. We should consider this change for the 3.0 of the .NET/C# driver as C# is now the only driver that calls &lt;tt&gt;buildInfo&lt;/tt&gt; and uses it in this way.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1649457">CSHARP-3480</key>
            <summary>Switch to using maxWireVersion rather than buildInfo to determine feature support</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="dmitry.lukyanov@mongodb.com">Dmitry Lukyanov</assignee>
                                    <reporter username="james.kovacs@mongodb.com">James Kovacs</reporter>
                        <labels>
                            <label>size-small</label>
                    </labels>
                <created>Mon, 15 Mar 2021 21:26:02 +0000</created>
                <updated>Sat, 28 Oct 2023 11:47:54 +0000</updated>
                            <resolved>Thu, 20 Jan 2022 01:03:37 +0000</resolved>
                                                    <fixVersion>2.15.0</fixVersion>
                                    <component>Internal</component>
                                        <votes>1</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4301986" author="xgen-internal-githook" created="Thu, 20 Jan 2022 01:02:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dmitry Lukyanov&apos;, &apos;email&apos;: &apos;dmitry.lukyanov@mongodb.com&apos;, &apos;username&apos;: &apos;DmitryLukyanov&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-3480&quot; title=&quot;Switch to using maxWireVersion rather than buildInfo to determine feature support&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-3480&quot;&gt;&lt;del&gt;CSHARP-3480&lt;/del&gt;&lt;/a&gt;: Switch to using maxWireVersion rather than buildInfo to determine feature support. (#720)&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-3480&quot; title=&quot;Switch to using maxWireVersion rather than buildInfo to determine feature support&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-3480&quot;&gt;&lt;del&gt;CSHARP-3480&lt;/del&gt;&lt;/a&gt;: Switch to using maxWireVersion rather than buildInfo to determine feature support.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/commit/c0f286bbe3911f461ba72922266355eba7790e24&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/commit/c0f286bbe3911f461ba72922266355eba7790e24&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3858071" author="jesse" created="Thu, 3 Jun 2021 17:54:56 +0000"  >&lt;p&gt;I&apos;d strongly recommend that the C# Driver stops calling buildinfo in the next major release. It would match the &lt;a href=&quot;https://github.com/mongodb/specifications/blob/master/source/mongodb-handshake/handshake.rst&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Handshake Spec&lt;/a&gt; that the other drivers follow. It&apos;s more important now because &quot;hello&quot; and other handshake commands are in API Version 1, but buildinfo is not in V1. We want to ensure, with the Versioned API, that MongoDB 5.0 drivers will be future-compatible with all future MongoDB releases for many years (until we eventually drop API V1). Therefore we included all the commands mentioned in drivers specs in V1. But with the C# driver depending the buildinfo command, we can&apos;t make that future-compatibility guarantee for C#.&lt;/p&gt;</comment>
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            <issuekey id="1874044">CSHARP-3854</issuekey>
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