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            <title>[SERVER-64548] Do not assume that the DatabaseVersion has always a valid timestamp</title>
                <link>https://jira.mongodb.org/browse/SERVER-64548</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In 5.0 we extended the DatabeVersion&#160;with a new field: a timestamp. The idea was that this timestamp would replace another field: the uuid. As part of the&#160;&lt;tt&gt;setFCV(5.0)&lt;/tt&gt;&#160;command, we patched up the information on the CSRS and asked all shards to refresh, patching up their routing and filtering information.&lt;/p&gt;

&lt;p&gt;However, we didn&apos;t think about what happened with mongos: it could totally happen that we had a mongos under FCV 5.0 sending commands with DBVersions that didn&apos;t have timestamps. However that was not a problem because the DatabaseVersion&#160;class wasn&apos;t assuming that the timestamp was mandatory, so if it wasn&apos;t present that class was relying on the epoch field.&lt;/p&gt;

&lt;p&gt;The problem was introduced in 5.1, when we changed the implementation of the DatabaseVersion&#160;to assume that the Timestamp was always present. The problematic scenario is when we are replacing the binaries: first we change the ones on the shards and afterwards the ones on the mongoses. Thus, it could happen that one of those stale mongoses send a command with a version that doesn&apos;t have timestamps to a shard that it is expecting them.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2002778">SERVER-64548</key>
            <summary>Do not assume that the DatabaseVersion has always a valid timestamp</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="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="2">Won&apos;t Fix</resolution>
                                        <assignee username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="sergi.mateo-bellido@mongodb.com">Sergi Mateo Bellido</reporter>
                        <labels>
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                <created>Wed, 16 Mar 2022 09:57:28 +0000</created>
                <updated>Wed, 12 Jul 2023 08:02:08 +0000</updated>
                            <resolved>Thu, 31 Mar 2022 13:51:27 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
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