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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-20640] Shell should not issue special isMaster commands for feature detection</title>
                <link>https://jira.mongodb.org/browse/SERVER-20640</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently the shell may issue multiple isMaster commands on the same connection for separate purposes. For instance, it might send one is master response to detect whether the server supports write commands and another to detect whether the server supports the find/getMore/killCursors commands. If the isMaster command was issued once when a connection is opened, these wire protocol version checks would not involve several round trips to the server.&lt;/p&gt;</description>
                <environment></environment>
        <key id="231547">SERVER-20640</key>
            <summary>Shell should not issue special isMaster commands for feature detection</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="9">Done</resolution>
                                        <assignee username="jonathan.reams@mongodb.com">Jonathan Reams</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Fri, 25 Sep 2015 14:58:17 +0000</created>
                <updated>Tue, 17 Nov 2015 18:34:23 +0000</updated>
                            <resolved>Thu, 5 Nov 2015 20:11:07 +0000</resolved>
                                                    <fixVersion>3.2.0-rc3</fixVersion>
                                    <component>Shell</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1080961" author="xgen-internal-githook" created="Thu, 5 Nov 2015 20:09:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jbreams&apos;, u&apos;name&apos;: u&apos;Jonathan Reams&apos;, u&apos;email&apos;: u&apos;jbreams@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20640&quot; title=&quot;Shell should not issue special isMaster commands for feature detection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20640&quot;&gt;&lt;del&gt;SERVER-20640&lt;/del&gt;&lt;/a&gt; Get wire versions from native DBClient instead of running isMaster&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4cf3913b4e19a05b6b5f67e099cc76df15088d7f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4cf3913b4e19a05b6b5f67e099cc76df15088d7f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1043663" author="david.storch" created="Fri, 25 Sep 2015 17:34:03 +0000"  >&lt;p&gt;Changing the title to reflect that this is about avoiding isMaster round trips specifically for feature detection (i.e. &quot;Does the remote node support the write commands?&quot;).&lt;/p&gt;</comment>
                            <comment id="1043585" author="rassi@10gen.com" created="Fri, 25 Sep 2015 16:27:23 +0000"  >&lt;p&gt;I don&apos;t believe that you can cache the isMaster response for the entire lifetime a shell connection.  I was under the impression that, in interactive mode, the shell sends isMaster after every statement because it needs to know if the server &quot;is a master&quot;, in order to generate the prompt (e.g. to tell whether to switch the &quot;rs:PRIMARY&amp;gt;&quot; prompt to &quot;rs:SECONDARY&amp;gt;&quot;).&lt;/p&gt;</comment>
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            <issuekey id="238738">SERVER-21397</issuekey>
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