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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>
    </build-info>


<item>
            <title>[SERVER-35385] _isSelf invoked unnecesarily on Debian-based distros</title>
                <link>https://jira.mongodb.org/browse/SERVER-35385</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;repl::isSelf has a fast path, and falls back to issuing _isSelf as a slow path.&lt;br/&gt;
For some reason the fast path doesn&apos;t kick in there, perhaps having to do with /proc file formats or ordering or the specifics of the Debian builder&apos;s network config.&lt;/p&gt;

&lt;p&gt;Ubuntu 18.04 workstation shows the same symptom.&lt;/p&gt;</description>
                <environment></environment>
        <key id="554055">SERVER-35385</key>
            <summary>_isSelf invoked unnecesarily on Debian-based distros</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-platform">DO NOT USE - Backlog - Platform Team</assignee>
                                    <reporter username="billy.donahue@mongodb.com">Billy Donahue</reporter>
                        <labels>
                    </labels>
                <created>Mon, 4 Jun 2018 19:40:25 +0000</created>
                <updated>Wed, 15 Apr 2020 21:47:38 +0000</updated>
                            <resolved>Mon, 11 Jun 2018 18:57:19 +0000</resolved>
                                                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1911480" author="billy.donahue" created="Tue, 5 Jun 2018 17:59:08 +0000"  >&lt;p&gt;I think Atlas nodes would take the fast path.&lt;/p&gt;

&lt;p&gt;They&apos;re going to be using automated rsconfigs that mention each host by a network-accessible IP address (or DNS name) that resolves to an exact number they&apos;d recognize as one of their&#160; network interface addresses.&lt;/p&gt;

&lt;p&gt;The slow path is taken when we&apos;re dealing with the ambiguities of nslookup of Unix hostname, the 127/8 subnet, and bind_ip=0.0.0.0. It would just be unit tests, really.&lt;/p&gt;</comment>
                            <comment id="1910679" author="schwerin" created="Tue, 5 Jun 2018 00:00:25 +0000"  >&lt;p&gt;I think the isself shortcut behavior is a lot of code that delivers not much value. I&apos;m curious if Atlas nodes meet the criteria for bypassing the check. If not, we should consider deleting the bypass code and always using the rpc to test for selfness.&lt;/p&gt;</comment>
                            <comment id="1910545" author="billy.donahue" created="Mon, 4 Jun 2018 21:28:39 +0000"  >&lt;p&gt;This happens because the Unix hostname appears in the replset config of this 1-node repl unit test.&lt;/p&gt;

&lt;p&gt;getAddrsForHost(&quot;myhostname:20020&quot;) yields 127.0.1.1 on Debian systems,&lt;/p&gt;

&lt;p&gt;In the test, we&apos;re using --bindIp 0.0.0.0.&lt;/p&gt;

&lt;p&gt;When isSelf walks all the ifaces, it makes a list of local ip addresses to match against the addresses associated with the rsconfig-specified host.&lt;br/&gt;
 This yields lo at 127.0.0.1 and some other LAN IP associated with the ethernet iface.&lt;br/&gt;
 It does not come up with the 127.0.1.1 associated with the Unix hostname that getAddrsForHost returned.&lt;/p&gt;

&lt;p&gt;So even though we are listening on 127.0.1.1:20020, and our hostname locally resolves to it, we don&apos;t consider 127.0.1.1 to be our &quot;self&quot;.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;{&lt;br/&gt;
 &#160; &#160; &quot;replSetInitiate&quot; : { &lt;br/&gt;
 &#160; &#160; &#160; &quot;_id&quot; : &quot;change_streams_required_privileges&quot;, &lt;br/&gt;
 &#160; &#160; &#160; &quot;protocolVersion&quot; : 1, &lt;br/&gt;
 &#160; &#160; &#160; &quot;members&quot; : [ &lt;br/&gt;
 &#160; &#160; &#160; &#160;&lt;/p&gt;

{ &#160; &#160; &#160; &#160; &#160; &quot;_id&quot; : 0, &#160; &#160; &#160; &#160; &#160; &quot;host&quot; : &quot;billydev:20020&quot; &#160; &#160; &#160; &#160; }


&lt;p&gt; &#160; &#160; &#160; ] &lt;br/&gt;
 &#160; &#160; } &lt;br/&gt;
 }&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                    </comments>
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="1315180">SERVER-47545</issuekey>
        </issuelink>
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                            <customfieldvalue>&lt;p&gt;inject failure in _isSelf handler.&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;python buildscripts/resmoke.py \&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160; &#160;--suite no_passthrough \&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160; &#160;jstests/noPassthrough/change_streams_required_privileges.js&lt;/span&gt;&lt;/pre&gt;
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