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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-47237] Add the &quot;Shard versioning and database versioning&quot; section to the sharding arch guide</title>
                <link>https://jira.mongodb.org/browse/SERVER-47237</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Guidelines:&lt;/p&gt;

&lt;p&gt;Should include&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;What does the versioning protocol achieve? E.g., allows a router to lazily discover that its routing cache is stale&lt;/li&gt;
	&lt;li&gt;What types of events cause a routing cache to be stale?&lt;/li&gt;
	&lt;li&gt;What are special version conventions we use? 0,0|0 for unsharded, 0,0|epoch for no chunk, 0,0|MAX for ignored&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Code references&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Where shardVersions are stored in a router&apos;s cache&lt;/li&gt;
	&lt;li&gt;An example of how shardVersion is attached in an egress message&lt;/li&gt;
	&lt;li&gt;Where shardVersions are parsed in the ServiceEntryPoint and put on the OperationShardingState&lt;/li&gt;
	&lt;li&gt;Where shardVersions are stored in a shard&apos;s filtering cache&lt;/li&gt;
	&lt;li&gt;The checkShardVersion method on a shard&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1300584">SERVER-47237</key>
            <summary>Add the &quot;Shard versioning and database versioning&quot; section to the sharding arch guide</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="blake.oler@mongodb.com">Blake Oler</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Wed, 1 Apr 2020 18:58:27 +0000</created>
                <updated>Sun, 29 Oct 2023 22:10:06 +0000</updated>
                            <resolved>Mon, 4 May 2020 17:25:03 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3067092" author="xgen-internal-githook" created="Mon, 4 May 2020 14:29:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Blake Oler&apos;, &apos;email&apos;: &apos;blake.oler@mongodb.com&apos;, &apos;username&apos;: &apos;BlakeIsBlake&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47237&quot; title=&quot;Add the &amp;quot;Shard versioning and database versioning&amp;quot; section to the sharding arch guide&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47237&quot;&gt;&lt;del&gt;SERVER-47237&lt;/del&gt;&lt;/a&gt; Add the &quot;Shard versioning and database versioning&quot; section to the sharding arch guide&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/29d18dc44fb9ae5054c8e269d6a3cafcc46c2899&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/29d18dc44fb9ae5054c8e269d6a3cafcc46c2899&lt;/a&gt;&lt;/p&gt;</comment>
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