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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-60746] Client sessions are not causally consistent for sharded metadata</title>
                <link>https://jira.mongodb.org/browse/SERVER-60746</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Gossiping the cluster time for &lt;a href=&quot;https://docs.mongodb.com/manual/core/read-isolation-consistency-recency/#client-sessions-and-causal-consistency-guarantees&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;causally consistent client sessions&lt;/a&gt; ensures causality for queries but it&apos;s not enough to ensure causality for sharded metadata operations.&lt;/p&gt;

&lt;p&gt;Scenario:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;One client communicating with 2 routers A and B&lt;/li&gt;
	&lt;li&gt;Router A performs &lt;tt&gt;shardCollection&lt;/tt&gt; on &lt;tt&gt;db.coll&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;Router B receives a query for&#160;&lt;tt&gt;db.coll&lt;/tt&gt;, refreshes from the CSRS with &lt;a href=&quot;https://github.com/mongodb/mongo/blob/0d369af9f5be858fb06ed7c8013e05365288dcb0/src/mongo/s/catalog/sharding_catalog_client_impl.cpp#L741&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;nearest read preference&lt;/a&gt; and read concern with &lt;a href=&quot;https://github.com/mongodb/mongo/blob/aa6774ea1785b60dd2f9a5684863718d9c9e91f4/src/mongo/s/config_server_catalog_cache_loader.cpp#L74&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;minimum last known config time&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;The CSRS secondary serving the refresh still didn&apos;t replicate the &lt;tt&gt;config.collections&lt;/tt&gt; entry for &lt;tt&gt;db.coll&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;Router B treats &lt;tt&gt;db.coll&lt;/tt&gt; as unsharded collection&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;At some point, router B will get to know that &lt;tt&gt;db.coll&lt;/tt&gt; is sharded (e.g. after targeting the primary). However, gossiping the &lt;tt&gt;configOpTime&lt;/tt&gt; and the &lt;tt&gt;topologyTime&lt;/tt&gt; to the client would have allowed the second router to be causally consistent when refershing with &lt;tt&gt;afterClusterTime&lt;/tt&gt; &amp;gt;= &lt;tt&gt;last known configOpTime&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1899487">SERVER-60746</key>
            <summary>Client sessions are not causally consistent for sharded metadata</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-catalog-and-routing">Backlog - Catalog and Routing</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                            <label>oldshardingemea</label>
                    </labels>
                <created>Fri, 15 Oct 2021 15:30:01 +0000</created>
                <updated>Thu, 26 Oct 2023 09:54:08 +0000</updated>
                                                                            <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5533786" author="JIRAUSER1257318" created="Thu, 29 Jun 2023 13:59:59 +0000"  >&lt;p&gt;Removing from ShardRoleAPI since this is a Router role issue.&lt;/p&gt;</comment>
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            <issuekey id="1946465">SERVER-61981</issuekey>
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