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    <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-48175] Update sharding architecture guide to include VectorClock details</title>
                <link>https://jira.mongodb.org/browse/SERVER-48175</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Potential template:&lt;/p&gt;

&lt;p&gt;The sharding vector clock (config OpTime, logical clock, databaseVersion, collectionVersion, shardVersion)&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Should include
	&lt;ul&gt;
		&lt;li&gt;What is the type of each of these versions&lt;/li&gt;
		&lt;li&gt;How is each version derived (e.g., shardVersion is the max across all chunks owned by the shard, etc)&lt;/li&gt;
		&lt;li&gt;What are the processes, at a high level, which advance each version (e.g. writes to the config server advance the config OpTime)&lt;/li&gt;
		&lt;li&gt;At a conceptual level, how are config OpTime and logical time gossiped?&lt;/li&gt;
		&lt;li&gt;Why is there a config OpTime separate from clusterTime?&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;Code references
	&lt;ul&gt;
		&lt;li&gt;Where config OpTime is attached in requests and responses&lt;/li&gt;
		&lt;li&gt;Where config OpTime is stored in memory on each node&lt;/li&gt;
		&lt;li&gt;Where clusterTime is attached in requests and responses&lt;/li&gt;
		&lt;li&gt;Where clusterTime is stored in memory on each node&lt;/li&gt;
		&lt;li&gt;An example of where shardVersion and databaseVersion are attached in egress requests and parsed in ingress requests&lt;/li&gt;
		&lt;li&gt;Where collectionVersion is used to do an incremental refresh&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;
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                <environment></environment>
        <key id="1349220">SERVER-48175</key>
            <summary>Update sharding architecture guide to include VectorClock details</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="13201">Fixed</resolution>
                                        <assignee username="kevin.pulo@mongodb.com">Kevin Pulo</assignee>
                                    <reporter username="kevin.pulo@mongodb.com">Kevin Pulo</reporter>
                        <labels>
                    </labels>
                <created>Wed, 13 May 2020 03:51:51 +0000</created>
                <updated>Sun, 29 Oct 2023 22:08:16 +0000</updated>
                            <resolved>Sun, 4 Oct 2020 12:20:16 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3424416" author="xgen-internal-githook" created="Sun, 4 Oct 2020 12:15:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kevin Pulo&apos;, &apos;email&apos;: &apos;kevin.pulo@mongodb.com&apos;, &apos;username&apos;: &apos;devkev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48175&quot; title=&quot;Update sharding architecture guide to include VectorClock details&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48175&quot;&gt;&lt;del&gt;SERVER-48175&lt;/del&gt;&lt;/a&gt; VectoClock architecture guide updates&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/800b1fdb10810290eba1f33b7455a1a3d782a6c9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/800b1fdb10810290eba1f33b7455a1a3d782a6c9&lt;/a&gt;&lt;/p&gt;</comment>
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