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    <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-1885] Host names must be distinct within first segment</title>
                <link>https://jira.mongodb.org/browse/SERVER-1885</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When setting up a replica set it appears only portion of the hostname up to the first period is checked for when doing the isSelf check. This results in a message about bad configs when attempting to use hosts of the following form: &lt;/p&gt;

&lt;p&gt;mongo1.primary.domain.com&lt;br/&gt;
mongo1.backup.domain.com&lt;/p&gt;

&lt;p&gt;I believe it is due to this portion of util/hostandport.h&lt;/p&gt;

&lt;p&gt; 86     /** returns true if strings seem to be the same hostname.&lt;br/&gt;
 87         &quot;nyc1&quot; and &quot;nyc1.acme.com&quot; are treated as the same.&lt;br/&gt;
 88         in fact &quot;nyc1.foo.com&quot; and &quot;nyc1.acme.com&quot; are treated the same - &lt;br/&gt;
 89         we oly look up to the first period.&lt;br/&gt;
 90     */&lt;br/&gt;
 91     inline bool sameHostname(const string&amp;amp; a, const string&amp;amp; b) &lt;/p&gt;
{
 92         return str::before(a, &apos;.&apos;) == str::before(b, &apos;.&apos;);
 93     }

&lt;p&gt;which appears to be called from the isSelf method in util/message.cpp which appears to be used in checkMembersUpForConfigChange of db/repl/rs_initiate.cpp&lt;/p&gt;


&lt;p&gt;I was unable to find information indicating that this was an intentional restriction on hostnames.&lt;/p&gt;</description>
                <environment></environment>
        <key id="13245">SERVER-1885</key>
            <summary>Host names must be distinct within first segment</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="tekante">Chris Johnson</reporter>
                        <labels>
                    </labels>
                <created>Mon, 4 Oct 2010 12:23:10 +0000</created>
                <updated>Tue, 12 Jul 2016 00:20:19 +0000</updated>
                            <resolved>Thu, 21 Oct 2010 20:47:23 +0000</resolved>
                                    <version>1.6.2</version>
                                    <fixVersion>1.7.2</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="19460" author="redbeard0531" created="Thu, 21 Oct 2010 20:47:23 +0000"  >&lt;p&gt;We now only consider hostnames equal if they are the same or one is a dotted prefix of the other so that &quot;a&quot;, &quot;a.b&quot;, and &quot;a.b.c&quot; are all the same but &quot;a.b&quot;, &quot;a.c&quot;, and &quot;a.com&quot; are all considered distinct.&lt;/p&gt;</comment>
                            <comment id="19458" author="auto" created="Thu, 21 Oct 2010 20:44:22 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;RedBeard0531&apos;, &apos;name&apos;: &apos;Mathias Stearn&apos;, &apos;email&apos;: &apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: Better sameHostname() &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1885&quot; title=&quot;Host names must be distinct within first segment&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1885&quot;&gt;&lt;del&gt;SERVER-1885&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/98a84c219dfa6ccae569fdcdea8f918f3273b5de&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/98a84c219dfa6ccae569fdcdea8f918f3273b5de&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="19448" author="dwight_10gen" created="Thu, 21 Oct 2010 18:08:47 +0000"  >&lt;p&gt;i agree it needs to be smarter.&lt;/p&gt;

&lt;p&gt;the main case we need to handle is &lt;/p&gt;

&lt;p&gt;  host01&lt;br/&gt;
vs&lt;br/&gt;
  host01.mycompany.com&lt;/p&gt;

&lt;p&gt;thse might be the same host &amp;#8211; we would want true for sameHost for this.&lt;/p&gt;

&lt;p&gt;otherwise i totally agree.&lt;/p&gt;</comment>
                            <comment id="19445" author="redbeard0531" created="Thu, 21 Oct 2010 16:52:06 +0000"  >&lt;p&gt;@Dwight: why do we compare hostnames like this? Is there any downside to just checking for equality?&lt;/p&gt;</comment>
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