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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-57128] Router&apos;s retry of successful DDL must not spawn a new coordinator</title>
                <link>https://jira.mongodb.org/browse/SERVER-57128</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, it is possible to end up in the following scenario:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Client issues a DDL operation&lt;/li&gt;
	&lt;li&gt;Mongos forwards the DDL operation to the primary shard&lt;/li&gt;
	&lt;li&gt;The primary shard gets killed right after the DDL suceeds (the coordinator document has been removed) BUT before replying to the mongos&lt;/li&gt;
	&lt;li&gt;The mongos retry targets the new primary: a new coordinator is instantiated and the DDL re-executed&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Objective of this ticket is to ensure that the retry arriving to the new primary results in a noop with the router receiving a proper successful response.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1743615">SERVER-57128</key>
            <summary>Router&apos;s retry of successful DDL must not spawn a new coordinator</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="backlog-server-sharding-emea">[DO NOT USE] Backlog - Sharding EMEA</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                            <label>PM-1965-Milestone-2</label>
                    </labels>
                <created>Fri, 21 May 2021 14:41:23 +0000</created>
                <updated>Tue, 6 Dec 2022 01:17:21 +0000</updated>
                            <resolved>Wed, 26 May 2021 10:29:01 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4188402" author="xgen-internal-githook" created="Mon, 15 Nov 2021 11:27:43 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Pierlauro Sciarelli&apos;, &apos;email&apos;: &apos;pierlauro.sciarelli@mongodb.com&apos;, &apos;username&apos;: &apos;pierlauro&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57271&quot; title=&quot;Complete TODO listed in SERVER-57128&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57271&quot;&gt;&lt;del&gt;SERVER-57271&lt;/del&gt;&lt;/a&gt; Complete TODO listed in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57128&quot; title=&quot;Router&amp;#39;s retry of successful DDL must not spawn a new coordinator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57128&quot;&gt;&lt;del&gt;SERVER-57128&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a9270c3bee7d54aa1b257d95aa42d5f6b4bda4d9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a9270c3bee7d54aa1b257d95aa42d5f6b4bda4d9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3817409" author="kaloian.manassiev" created="Mon, 24 May 2021 09:52:34 +0000"  >&lt;p&gt;I don&apos;t think we can possibly fix this scenario unless the client starts attaching LSID/txnNumber just like retryable writes. It is essentially a retryable DDL. Even if we fix it at the level of MongoS &amp;lt; - &amp;gt; MongoD, the same issue exists between Client &amp;lt; - &amp;gt; MongoD.&lt;/p&gt;

&lt;p&gt;I propose that we close this ticket, since it is no different than DDL against a replica set.&lt;/p&gt;</comment>
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