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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-62907] Vector clock components must survive CSRS non-rolling restart</title>
                <link>https://jira.mongodb.org/browse/SERVER-62907</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The current implementation of the vector clock is resilient to step-downs and rolling restarts of the config server because at least one of its nodes is alive, keeping the correct values of each component that are then gossiped out.&lt;/p&gt;

&lt;p&gt;In case the whole config server goes down or simply gets restarted in a non-rolling fashion, the vector clock is reinitialized on the new CSRS primary with:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Cluster time = time of the last committed operation on the oplog.&lt;/li&gt;
	&lt;li&gt;Config time = 0 (for a very brief moment, as one majority committed write will tick it to the cluster time).&lt;/li&gt;
	&lt;li&gt;Topology time = 0 (as long as a shard is not successfully added/removed).&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;There are high probabilities that causal consistency would be broken in such scenario because:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Cluster/config times may go back in the past in case the system time is incorrect.&lt;/li&gt;
	&lt;li&gt;The topology time may be incorrect for a long time.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1969201">SERVER-62907</key>
            <summary>Vector clock components must survive CSRS non-rolling restart</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="antonio.fuschetto@mongodb.com">Antonio Fuschetto</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                            <label>shardingemea-qw</label>
                    </labels>
                <created>Mon, 24 Jan 2022 11:02:55 +0000</created>
                <updated>Sun, 29 Oct 2023 21:43:45 +0000</updated>
                            <resolved>Mon, 28 Feb 2022 10:04:31 +0000</resolved>
                                    <version>5.2.0</version>
                    <version>5.0.5</version>
                    <version>5.1.1</version>
                                    <fixVersion>6.0.0-rc0</fixVersion>
                    <fixVersion>5.0.7</fixVersion>
                    <fixVersion>5.3.0-rc2</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="4383563" author="xgen-internal-githook" created="Tue, 1 Mar 2022 15:57:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Antonio Fuschetto&apos;, &apos;email&apos;: &apos;antonio.fuschetto@mongodb.com&apos;, &apos;username&apos;: &apos;afuschetto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62907&quot; title=&quot;Vector clock components must survive CSRS non-rolling restart&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62907&quot;&gt;&lt;del&gt;SERVER-62907&lt;/del&gt;&lt;/a&gt; Vector clock components must survive CSRS non-rolling restart&lt;br/&gt;
Branch: v5.3&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c3ca240424abf46c68499b300d879fe32df68a20&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c3ca240424abf46c68499b300d879fe32df68a20&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4383548" author="xgen-internal-githook" created="Tue, 1 Mar 2022 15:54:30 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Antonio Fuschetto&apos;, &apos;email&apos;: &apos;antonio.fuschetto@mongodb.com&apos;, &apos;username&apos;: &apos;afuschetto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62907&quot; title=&quot;Vector clock components must survive CSRS non-rolling restart&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62907&quot;&gt;&lt;del&gt;SERVER-62907&lt;/del&gt;&lt;/a&gt; Vector clock components must survive CSRS non-rolling restart&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f54624cadf5ee6e5906016b5b8d41718f098fa81&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f54624cadf5ee6e5906016b5b8d41718f098fa81&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4375976" author="xgen-internal-githook" created="Fri, 25 Feb 2022 00:34:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Antonio Fuschetto&apos;, &apos;email&apos;: &apos;antonio.fuschetto@mongodb.com&apos;, &apos;username&apos;: &apos;afuschetto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62907&quot; title=&quot;Vector clock components must survive CSRS non-rolling restart&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62907&quot;&gt;&lt;del&gt;SERVER-62907&lt;/del&gt;&lt;/a&gt; Vector clock components must survive CSRS non-rolling restart&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/74280e7af5405e41d2f128d9a261e4d139cc8e71&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/74280e7af5405e41d2f128d9a261e4d139cc8e71&lt;/a&gt;&lt;/p&gt;</comment>
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                            <customfieldvalue>&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;
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				&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;mlaunch init --dir data --sharded &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2&lt;/span&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; --replicaset &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&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; --csrs &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&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; --nodes &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&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; --verbose --port &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;20000&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;mlaunch start&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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