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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-40632] Reload shard registry before attempting to get number of shards in ShardRegistry::getNumShards()</title>
                <link>https://jira.mongodb.org/browse/SERVER-40632</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If &lt;a href=&quot;https://github.com/mongodb/mongo/blob/afcb670f36b9cabda26d719c81f3991b9b2ed5b8/src/mongo/s/client/shard_registry.cpp#L187-L191&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;getNumShards()&lt;/a&gt; returns before the shard registry is populated, it&apos;s possible that it can incorrectly return that zero shards exist.&lt;/p&gt;

&lt;p&gt;This function is only used in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/afcb670f36b9cabda26d719c81f3991b9b2ed5b8/src/mongo/db/sessions_collection_config_server.cpp#L59-L63&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;one place&lt;/a&gt;. &lt;/p&gt;

&lt;p&gt;This ticket is simply to either:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Remove this function and replace with getAllShardIds(), which &lt;em&gt;does&lt;/em&gt; do a reload, or:&lt;/li&gt;
	&lt;li&gt;Add a reload inside getNumShards() if the number turns out to be zero.&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="737730">SERVER-40632</key>
            <summary>Reload shard registry before attempting to get number of shards in ShardRegistry::getNumShards()</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="13203">Gone away</resolution>
                                        <assignee username="tommaso.tocci@mongodb.com">Tommaso Tocci</assignee>
                                    <reporter username="blake.oler@mongodb.com">Blake Oler</reporter>
                        <labels>
                    </labels>
                <created>Fri, 12 Apr 2019 20:46:32 +0000</created>
                <updated>Fri, 27 Oct 2023 20:42:53 +0000</updated>
                            <resolved>Tue, 2 Nov 2021 12:29:10 +0000</resolved>
                                    <version>3.6.11</version>
                    <version>4.0.9</version>
                    <version>4.1.7</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4162761" author="tommaso.tocci" created="Tue, 2 Nov 2021 12:29:10 +0000"  >&lt;p&gt;This has been fixed in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54230&quot; title=&quot;Stop returning sorted shard IDs vector from ShardRegistry&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54230&quot;&gt;&lt;del&gt;SERVER-54230&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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