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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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            <title>[SERVER-52784] Retry command on stale exception on shards only if the shard is stale</title>
                <link>https://jira.mongodb.org/browse/SERVER-52784</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Thanks to&#160; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28943&quot; title=&quot;Make shards retry non-write commands on stale version exceptions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28943&quot;&gt;&lt;del&gt;SERVER-28943&lt;/del&gt;&lt;/a&gt; shards now &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e69c967ff8b53634770438dfe9a5c7d13548351b/src/mongo/db/service_entry_point_common.cpp#L1579-L1591&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;retry non-write commands on stale exception&lt;/a&gt;.&lt;br/&gt;
 This is done unconditionally even if &lt;a href=&quot;https://github.com/mongodb/mongo/blob/90cfa3eeb18000ca3081e83be66ca4eaa244665e/src/mongo/db/s/collection_sharding_runtime.cpp#L353-L354&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the exception&lt;/a&gt; is indicating that the router was stale.&lt;/p&gt;

&lt;p&gt;Once database and collection version will be truly comparable (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52587&quot; title=&quot;Making collection and database instances comparable through cluster time (no more epochs)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52587&quot;&gt;&lt;del&gt;SERVER-52587&lt;/del&gt;&lt;/a&gt;) we can conditionally refresh and retry the command only if &quot;requiredVersion (Router) &amp;gt; wantedVersion (Shard)&quot;.&lt;/p&gt;

&lt;p&gt;This new behavior should be either addressed once 5.0 becomes last-lts or should be guarded by an FCV flag in order to be sure that we are on a binary version that uses truly comparable database and collection versions.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1539296">SERVER-52784</key>
            <summary>Retry command on stale exception on shards only if the shard is stale</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-sharding-emea">[DO NOT USE] Backlog - Sharding EMEA</assignee>
                                    <reporter username="tommaso.tocci@mongodb.com">Tommaso Tocci</reporter>
                        <labels>
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                <created>Wed, 11 Nov 2020 17:41:40 +0000</created>
                <updated>Tue, 6 Dec 2022 01:45:05 +0000</updated>
                            <resolved>Tue, 23 Mar 2021 08:42:44 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3499796" author="ratika.gandhi" created="Fri, 20 Nov 2020 15:25:05 +0000"  >&lt;p&gt;It is a nice idea but not a high priority right now.&lt;/p&gt;</comment>
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