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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>[DOCS-10539] Docs for SERVER-28948: open up secondaries to checking shardVersion</title>
                <link>https://jira.mongodb.org/browse/DOCS-10539</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h1&gt;&lt;a name=&quot;DocumentationRequestSummary%3A&quot;&gt;&lt;/a&gt;Documentation Request Summary: &lt;/h1&gt;

&lt;p&gt;This ticket makes shard secondaries participate in the shard versioning protocol. This makes them:&lt;br/&gt;
1) return an error for a request from mongos if the mongos&apos;s routing table cache is more stale than the secondary&apos;s, so that mongos refreshes its cache and re-targets&lt;br/&gt;
2) filter results using their (new) routing table cache, so that they don&apos;t return oprhaned documents for versioned requests&lt;/p&gt;

&lt;p&gt;The following commands were previously unversioned against secondaries, but are now versioned:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;aggregate&lt;/li&gt;
	&lt;li&gt;count&lt;/li&gt;
	&lt;li&gt;find&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The following commands are still unversioned against secondaries, because they were unversioned against primaries:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;geoNear&lt;/li&gt;
	&lt;li&gt;distinct&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Finally, note that the following commands are not supported on sharded collections:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;group&lt;/li&gt;
&lt;/ul&gt;

</description>
                <environment></environment>
        <key id="405688">DOCS-10539</key>
            <summary>Docs for SERVER-28948: open up secondaries to checking shardVersion</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="kevin.albertson@mongodb.com">Kevin Albertson</assignee>
                                    <reporter username="emily.hall">Emily Hall</reporter>
                        <labels>
                    </labels>
                <created>Tue, 18 Jul 2017 18:26:48 +0000</created>
                <updated>Sun, 29 Oct 2023 13:59:27 +0000</updated>
                            <resolved>Mon, 6 Nov 2017 18:59:25 +0000</resolved>
                                                    <fixVersion>3.5.11</fixVersion>
                                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1717835" author="xgen-internal-githook" created="Mon, 6 Nov 2017 18:15:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kevin Albertson&apos;, &apos;username&apos;: &apos;kevinAlbs&apos;, &apos;email&apos;: &apos;kevin.albertson@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-10539&quot; title=&quot;Docs for SERVER-28948: open up secondaries to checking shardVersion&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-10539&quot;&gt;&lt;del&gt;DOCS-10539&lt;/del&gt;&lt;/a&gt; geoNear and distinct may return orphans&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/1dff0789ca4082f4d8f2d50f36385ccf24e418ff&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/1dff0789ca4082f4d8f2d50f36385ccf24e418ff&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1706627" author="kevin.albertson" created="Mon, 23 Oct 2017 20:31:56 +0000"  >&lt;p&gt;Discussed with Tess and Esha. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3645&quot; title=&quot;Sharded collection counts (on primary) can report too many results&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3645&quot;&gt;&lt;del&gt;SERVER-3645&lt;/del&gt;&lt;/a&gt; is still applicable, so count without a predicate may still overcount if there are orphaned documents. It might be worth documenting the current status of these commands to avoid any surprises to users:&lt;/p&gt;

&lt;p&gt;We already document that count may return an inaccurate count when there are orphaned documents. We should add similar notes to geoNear and distinct&lt;/p&gt;</comment>
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