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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>
    </build-info>


<item>
            <title>[SERVER-45910] Router might target wrong shard on write operation for unsharded collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-45910</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Suppose we have 2 shards: &lt;em&gt;shard0&lt;/em&gt; and &lt;em&gt;shard1&lt;/em&gt; and 2 routers: &lt;em&gt;router0&lt;/em&gt; and &lt;em&gt;router1&lt;/em&gt;.&lt;/p&gt;

&lt;p&gt;From &lt;em&gt;router0&lt;/em&gt; we create an unsharded collection making sure that the primary shard is &lt;em&gt;shard0.&lt;/em&gt;&#160;If we issue a write operation from &lt;em&gt;router1&lt;/em&gt; to that same collection, it might be targeted to &lt;em&gt;shard1&lt;/em&gt;, which will cause the insert operation to fail. Refer to the build failure comments for more information.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1124612">SERVER-45910</key>
            <summary>Router might target wrong shard on write operation for unsharded collection</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="blake.oler@mongodb.com">Blake Oler</assignee>
                                    <reporter username="marcos.grillo@mongodb.com">Marcos Jos&#233; Grillo Ramirez</reporter>
                        <labels>
                            <label>sharding-csrs-stepdown-only</label>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Fri, 31 Jan 2020 18:05:16 +0000</created>
                <updated>Sun, 29 Oct 2023 22:12:40 +0000</updated>
                            <resolved>Wed, 8 Apr 2020 14:26:40 +0000</resolved>
                                                    <fixVersion>4.2.6</fixVersion>
                    <fixVersion>4.0.19</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3083364" author="xgen-internal-githook" created="Wed, 13 May 2020 15:20:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Blake Oler&apos;, &apos;email&apos;: &apos;blake.oler@mongodb.com&apos;, &apos;username&apos;: &apos;BlakeIsBlake&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45910&quot; title=&quot;Router might target wrong shard on write operation for unsharded collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45910&quot;&gt;&lt;del&gt;SERVER-45910&lt;/del&gt;&lt;/a&gt; Ensure all routers see result of movePrimary in change_streams_primary_shard_unaware.js&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 912bce679aeb48503175f3ac1cb0a87f32f0463f)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e478a6c8cd4e6cd9bcd7e842d1f51ce462ffc9de&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e478a6c8cd4e6cd9bcd7e842d1f51ce462ffc9de&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3027791" author="xgen-internal-githook" created="Mon, 6 Apr 2020 17:31:06 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Blake Oler&apos;, &apos;email&apos;: &apos;blake.oler@mongodb.com&apos;, &apos;username&apos;: &apos;BlakeIsBlake&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45910&quot; title=&quot;Router might target wrong shard on write operation for unsharded collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45910&quot;&gt;&lt;del&gt;SERVER-45910&lt;/del&gt;&lt;/a&gt; Ensure all routers see result of movePrimary in change_streams_primary_shard_unaware.js&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/912bce679aeb48503175f3ac1cb0a87f32f0463f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/912bce679aeb48503175f3ac1cb0a87f32f0463f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2839105" author="marcos.grillo" created="Fri, 7 Feb 2020 16:42:17 +0000"  >&lt;p&gt;We could use 2 routers instead of 3 and issue the insert from the first router instead of the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2a5433168a53044cb6b4fa8083e4cfd7ba142221/jstests/sharding/change_streams_primary_shard_unaware.js#L49&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;third&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2838982" author="esha.maharishi@10gen.com" created="Fri, 7 Feb 2020 16:21:51 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=marcos.grillo&quot; class=&quot;user-hover&quot; rel=&quot;marcos.grillo&quot;&gt;marcos.grillo&lt;/a&gt;, is there a fix we could make to the test in earlier branches to prevent this failure from occurring on those branches?&lt;/p&gt;</comment>
                            <comment id="2838973" author="esha.maharishi@10gen.com" created="Fri, 7 Feb 2020 16:21:02 +0000"  >&lt;p&gt;Note, this was fixed in 4.4 by PM-1051 &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</comment>
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