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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-84180] refineCollectionShardKey does not rewrite the new shard key for time-series collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-84180</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;refineCollectionShardKey can be called on a time-series collection to change the shardKey from {metaField: 1} to {metaField: 1, timeField: 1}. However, we hit &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e85ad8897c810bd5bda16ebc94c2318a16563da5/src/mongo/db/s/refine_collection_shard_key_coordinator.cpp#L224-L231&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this error&lt;/a&gt; when trying to do so. When we compare the old key and the new key the old key is correctly rewritten for a time-series collection, but the new key is not rewritten, leading to the error. There is an example of this error in the comments.&lt;/p&gt;

&lt;p&gt;We do have a test that covers this case, but it did not show up in testing, because the tests have the metaField named &quot;meta&quot;, so we didn&apos;t catch the error where we are not rewriting the shardKey. The test is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e85ad8897c810bd5bda16ebc94c2318a16563da5/jstests/sharding/timeseries_sharding_admin_commands.js#L232-L236&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; and should avoid using &quot;meta&quot; as the metaField name. We noticed this while investigating &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77112&quot; title=&quot;shardCollection and createIndex create different indexes on time-series buckets collections &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77112&quot;&gt;&lt;del&gt;SERVER-77112&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2524997">SERVER-84180</key>
            <summary>refineCollectionShardKey does not rewrite the new shard key for time-series collections</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="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</assignee>
                                    <reporter username="gil.alon@mongodb.com">Gil Alon</reporter>
                        <labels>
                            <label>car-investigation</label>
                    </labels>
                <created>Thu, 14 Dec 2023 16:27:52 +0000</created>
                <updated>Tue, 6 Feb 2024 14:03:39 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>5</watches>
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            <issuekey id="2546346">SERVER-85243</issuekey>
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            <issuekey id="2540646">SERVER-84682</issuekey>
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