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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-58730] Implement a barrier for disallowing direct writes to shards</title>
                <link>https://jira.mongodb.org/browse/SERVER-58730</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Due to the current architecture of sharding, all write operations in a sharded cluster rely on the shard versioning protocol as a way to ensure that writes are going to the shard where they are supposed to be. This also has a nice side benefit that we don&apos;t have to incur performance penalty for checking whether the shard owns the write.&lt;/p&gt;

&lt;p&gt;Because of the above, direct writes to a shard have the potential of corrupting data, because they don&apos;t observe the shard versioning protocol, so we should disallow them.&lt;/p&gt;

&lt;p&gt;However, in order to allow customers to transition from a replica set to a sharded cluster without incurring downtime for their applications, there must be a window of time when direct writes to the shard are permitted.&lt;/p&gt;

&lt;p&gt;This ticket is to implement some form of barrier after which we disallow direct writes to any shard in a sharded cluster.&lt;/p&gt;

&lt;p&gt;The barrier doesn&apos;t need to be very granular and it should be acceptable such a barrier to be &quot;the first time someone calls &lt;tt&gt;shardCollection&lt;/tt&gt; or &lt;tt&gt;addShard&lt;/tt&gt;&quot;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1827490">SERVER-58730</key>
            <summary>Implement a barrier for disallowing direct writes to shards</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="backlog-server-sharding-emea">[DO NOT USE] Backlog - Sharding EMEA</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Wed, 21 Jul 2021 17:20:39 +0000</created>
                <updated>Tue, 25 Apr 2023 08:04:21 +0000</updated>
                            <resolved>Tue, 25 Apr 2023 08:04:21 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="3955674" author="bruce.lucas@10gen.com" created="Wed, 21 Jul 2021 17:37:54 +0000"  >&lt;p&gt;Seems plausible.&lt;/p&gt;</comment>
                            <comment id="3955668" author="kaloian.manassiev" created="Wed, 21 Jul 2021 17:36:05 +0000"  >&lt;p&gt;For emergency maintentance, backup/restore, etc, the restriction would be lifted by the fact that such nodes will not have &lt;tt&gt;--shardsvr&lt;/tt&gt; when started.&lt;/p&gt;

&lt;p&gt;For testing, that&apos;s a good point because we have tests which write directly, so probably &lt;tt&gt;--testComandsEnabled&lt;/tt&gt; should be taken into account?&lt;/p&gt;</comment>
                            <comment id="3955663" author="bruce.lucas@10gen.com" created="Wed, 21 Jul 2021 17:34:21 +0000"  >&lt;p&gt;I imagine there would need to be some way to override the restriction for testing, debugging, and emergency maintenance.&lt;/p&gt;</comment>
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