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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-59384] Should provide ability to perform periodic DNS health checks</title>
                <link>https://jira.mongodb.org/browse/SERVER-59384</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;test if connection can be made to configured DNS servers&lt;/li&gt;
	&lt;li&gt;attempt to resolve an address&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;We need to build a representative list of servers to test. This might be tricky of somehow we pick servers that actually do have incorrect DNS name, and we treat it as a fatal error. A simple solution: &lt;br/&gt;
1. we build a list of servers discovered, this may include many shards and 3 config servers. Potentially, it could be hundreds of them&lt;br/&gt;
2. when building the list, cap it at some number like 20, so we don&apos;t pull 1,000 servers for really large clusters&lt;br/&gt;
3. shuffle the list randomly and pick the first 10 servers. Every time, the list of those 10 servers to resolve will be different, thus we avoid some unfortunate combination of servers that always fail&lt;/p&gt;

&lt;p&gt;Remember it&apos;s important to always cap the list of servers we resolve, we need to control the cost.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1852393">SERVER-59384</key>
            <summary>Should provide ability to perform periodic DNS health checks</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="kshitij.gupta@mongodb.com">Kshitij Gupta</assignee>
                                    <reporter username="lamont.nelson@mongodb.com">Lamont Nelson</reporter>
                        <labels>
                            <label>pm-2364-faulty-mongos</label>
                    </labels>
                <created>Mon, 16 Aug 2021 19:00:06 +0000</created>
                <updated>Sun, 29 Oct 2023 21:49:29 +0000</updated>
                            <resolved>Thu, 3 Feb 2022 14:11:22 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4410016" author="xgen-internal-githook" created="Mon, 14 Mar 2022 14:39:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kshitij Gupta&apos;, &apos;email&apos;: &apos;kshitij.gupta@mongodb.com&apos;, &apos;username&apos;: &apos;kshitijng&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59384&quot; title=&quot;Should provide ability to perform periodic DNS health checks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59384&quot;&gt;&lt;del&gt;SERVER-59384&lt;/del&gt;&lt;/a&gt;: Should provide ability to perform periodic DNS health checks&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 1d8aaed7f9286ce90317d03fc1815bb58b43e31d)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/47833c8bd40200134206a35a137b4fc68671154f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/47833c8bd40200134206a35a137b4fc68671154f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4410013" author="xgen-internal-githook" created="Mon, 14 Mar 2022 14:39:03 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Andrew Shuvalov&apos;, &apos;email&apos;: &apos;andrew.shuvalov@mongodb.com&apos;, &apos;username&apos;: &apos;shuvalov-mdb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59384&quot; title=&quot;Should provide ability to perform periodic DNS health checks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59384&quot;&gt;&lt;del&gt;SERVER-59384&lt;/del&gt;&lt;/a&gt; 5.0 backport related changes&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/9cdfa4d6cb4d740c23b2276fc4f08c71fa7746e6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/9cdfa4d6cb4d740c23b2276fc4f08c71fa7746e6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4332453" author="xgen-internal-githook" created="Thu, 3 Feb 2022 06:34:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kshitij Gupta&apos;, &apos;email&apos;: &apos;kshitij.gupta@mongodb.com&apos;, &apos;username&apos;: &apos;kshitijng&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59384&quot; title=&quot;Should provide ability to perform periodic DNS health checks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59384&quot;&gt;&lt;del&gt;SERVER-59384&lt;/del&gt;&lt;/a&gt;: Should provide ability to perform periodic DNS health checks&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1d8aaed7f9286ce90317d03fc1815bb58b43e31d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1d8aaed7f9286ce90317d03fc1815bb58b43e31d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4332452" author="xgen-internal-githook" created="Thu, 3 Feb 2022 06:34:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kshitij Gupta&apos;, &apos;email&apos;: &apos;kshitij.gupta@mongodb.com&apos;, &apos;username&apos;: &apos;kshitijng&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59384&quot; title=&quot;Should provide ability to perform periodic DNS health checks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59384&quot;&gt;&lt;del&gt;SERVER-59384&lt;/del&gt;&lt;/a&gt;: Should provide ability to perform periodic DNS health checks.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/8d867819126e6ce4a11fc71d9b9b0241d4106529&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/8d867819126e6ce4a11fc71d9b9b0241d4106529&lt;/a&gt;&lt;/p&gt;</comment>
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