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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-27475] mongos should request an update only of the collection not found</title>
                <link>https://jira.mongodb.org/browse/SERVER-27475</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In releases &amp;lt;= 3.4.x, when mongos gets an error from a shard reporting that a collection requested does not exist on the shard, it retrieves the entire list of collections from the config server.  It depends on having collections that have been dropped marked as such, so that it can remove corresponding entries, and chunks, from its cache. As a consequence, &quot;dropped&quot; collections accumulate in the collections list, and are never cleaned up.&lt;/p&gt;

&lt;p&gt;In 3.6, mongos should ask the config server only about the collection that had the failure.  Mongos and the balancer still need to filter out entries marked as dropped, because they will still see them, until 3.8; and the 3.6 config server still needs to mark dropped collections in its collections list, so it can serve them to 3.4 mongos.&lt;/p&gt;

&lt;p&gt;Entries for dropped collections can be scrubbed from the collections list in 3.8, because the 3.6 mongos will not be looking for them.  See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27474&quot; title=&quot;Eliminate &amp;quot;dropped&amp;quot; collections from config server list of collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27474&quot;&gt;&lt;del&gt;SERVER-27474&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="340141">SERVER-27475</key>
            <summary>mongos should request an update only of the collection not found</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="3">Duplicate</resolution>
                                        <assignee username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="nathan.myers">Nathan Myers</reporter>
                        <labels>
                    </labels>
                <created>Tue, 20 Dec 2016 17:25:09 +0000</created>
                <updated>Mon, 20 Mar 2017 12:17:35 +0000</updated>
                            <resolved>Mon, 20 Mar 2017 12:17:35 +0000</resolved>
                                    <version>3.5.1</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1527994" author="kaloian.manassiev" created="Mon, 20 Mar 2017 12:17:09 +0000"  >&lt;p&gt;With the switch to use the CatalogCache to do metadata refresh, this is no longer a problem.&lt;/p&gt;</comment>
                            <comment id="1462314" author="nathan.myers" created="Tue, 20 Dec 2016 17:28:44 +0000"  >&lt;p&gt;see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27393&quot; title=&quot;Balancer taking 100% CPU due to large number of dropped sharded collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27393&quot;&gt;&lt;del&gt;SERVER-27393&lt;/del&gt;&lt;/a&gt; for problem fixed in 3.4.x caused by retaining records of dropped collections.&lt;/p&gt;</comment>
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