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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-79954] Support time-series retryable update for unsharded collections in a sharded cluster</title>
                <link>https://jira.mongodb.org/browse/SERVER-79954</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For all time-series collections, sharded or unsharded, in a sharded cluster, we need to run retryable updates through the clustered version of the internal transaction API to ensure atomicity. This means we need to make this decision on mongos and initiate the transaction there. But currently, we don&apos;t track unsharded collections, time-series or non-time-series, in the sharding catalog.&lt;/p&gt;

&lt;p&gt;Running a retryable time-series update on an unsharded collection in a sharded cluster now will fail because the command simply gets routed to the primary shard without running in a transaction and uses the replSet version of the transaction API on mongod. The mongod will then return the error:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;Transaction API does not currently support use within operations with shard or database versions without using router commands&quot;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&lt;/tbody&gt;
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&lt;p/&gt;
&lt;p&gt;After &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81495&quot; title=&quot;Support tracking unsplittable timeseries in the sharding catalog&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81495&quot;&gt;&lt;del&gt;SERVER-81495&lt;/del&gt;&lt;/a&gt;, in a sharded cluster, we will check if a collection, sharded or unsharded, is time-series, and always use the sharded version of the internal transaction API to run retryable time-series updates.&lt;/p&gt;

&lt;p&gt;Alternatively, we might make the shard to run the clustered version of the internal transaction API. This makes the mongod to act as the router, which would be quite complicated to debug and reason about.&lt;/p&gt;

&lt;p&gt;Another potential temporary workaround is to make the shard to return an error to the router to make it retry the command in a transaction (a two-phase approach).&lt;/p&gt;

&lt;p&gt;Both of these workarounds can be removed completely once &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81495&quot; title=&quot;Support tracking unsplittable timeseries in the sharding catalog&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81495&quot;&gt;&lt;del&gt;SERVER-81495&lt;/del&gt;&lt;/a&gt; is done.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2416149">SERVER-79954</key>
            <summary>Support time-series retryable update for unsharded collections in a sharded cluster</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="13201">Fixed</resolution>
                                        <assignee username="yuhong.zhang@mongodb.com">Yuhong Zhang</assignee>
                                    <reporter username="yuhong.zhang@mongodb.com">Yuhong Zhang</reporter>
                        <labels>
                    </labels>
                <created>Fri, 11 Aug 2023 23:58:28 +0000</created>
                <updated>Thu, 30 Nov 2023 00:22:15 +0000</updated>
                            <resolved>Thu, 30 Nov 2023 00:22:14 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5914150" author="xgen-internal-githook" created="Wed, 29 Nov 2023 22:52:30 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Yuhong Zhang&apos;, &apos;email&apos;: &apos;yuhong.zhang@mongodb.com&apos;, &apos;username&apos;: &apos;YuhongZhang98&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79954&quot; title=&quot;Support time-series retryable update for unsharded collections in a sharded cluster&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79954&quot;&gt;&lt;del&gt;SERVER-79954&lt;/del&gt;&lt;/a&gt; Support time-series retryable update for unsharded collections&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2b88f990fff51d4323ec798573821f692b4fc6ae&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2b88f990fff51d4323ec798573821f692b4fc6ae&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2493711">SERVER-82927</issuekey>
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