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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-35252] All config server metadata commands that read from ShardRegistry might read stale data</title>
                <link>https://jira.mongodb.org/browse/SERVER-35252</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If a thread doing removeShard on the config server calls &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/s/config/configsvr_remove_shard_command.cpp#L111&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;shardRegistry-&amp;gt;getShard()&lt;/a&gt; in order to check for the existence of a shard, it may not see that the shard has already been removed by another thread. If instead of getShard() we perform a local read + wait for majority write concern, if a concurrent remove is happening but not yet replicated, we will correctly error out. Repro is attached for test configsvr_metadata_commands_require_majority_write_concern.js. &lt;/p&gt;</description>
                <environment></environment>
        <key id="550002">SERVER-35252</key>
            <summary>All config server metadata commands that read from ShardRegistry might read stale data</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</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="matthew.saltz@mongodb.com">Matthew Saltz</reporter>
                        <labels>
                            <label>oldshardingemea</label>
                    </labels>
                <created>Fri, 25 May 2018 20:54:08 +0000</created>
                <updated>Thu, 26 Oct 2023 09:57:51 +0000</updated>
                                                                            <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="4138320" author="kaloian.manassiev" created="Thu, 21 Oct 2021 11:43:37 +0000"  >&lt;p&gt;Leaving this ticket on the add/removeShard epic. Commands running on the config server should do direct local reads/writes instead of going through the caches. Same as &lt;tt&gt;__configsvrCommitChunkMove&lt;/tt&gt; for example.&lt;/p&gt;</comment>
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                            <attachment id="187701" name="removeshardrepro.patch" size="7867" author="matthew.saltz@mongodb.com" created="Fri, 25 May 2018 20:48:39 +0000"/>
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