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    <title>MongoDB Jira</title>
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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-30797] Shard primaries must commit a majority write before using updated chunk routing tables</title>
                <link>https://jira.mongodb.org/browse/SERVER-30797</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After receiving a chunk routing table change and before putting it to use, a shard primary needs to confirm that it was the primary at the time it received the change. Otherwise, it may use a version of the routing table inconsistent with the data that it stores, potentially leading it to return orphans or fail to return results at read concerns &quot;local&quot; and stronger.&lt;/p&gt;

&lt;p&gt;&amp;#8211; Details &amp;#8211;&lt;br/&gt;
This can happen if the shard is split-brain (has two primaries on either side of a network partition), and the shard has participated in a migration through the newer primary. The old primary can receive a versioned request, refresh its routing table from the config server, and service the request in the short window before it realizes there&apos;s a new primary. If a chunk has been donated, the old primary will return orphans; if received, it will miss data.&lt;/p&gt;

&lt;p&gt;Further, if the old primary persists the routing table updates, &lt;b&gt;any secondaries on the same side of the network partition&lt;/b&gt; can also exhibit this incorrect behavior.&lt;/p&gt;</description>
                <environment></environment>
        <key id="419472">SERVER-30797</key>
            <summary>Shard primaries must commit a majority write before using updated chunk routing tables</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="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="schwerin@mongodb.com">Andy Schwerin</reporter>
                        <labels>
                    </labels>
                <created>Wed, 23 Aug 2017 18:00:57 +0000</created>
                <updated>Mon, 30 Oct 2023 23:14:05 +0000</updated>
                            <resolved>Tue, 3 Oct 2017 14:37:48 +0000</resolved>
                                                    <fixVersion>3.6.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1687812" author="xgen-internal-githook" created="Tue, 3 Oct 2017 14:37:06 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;dianna.hohensee@10gen.com&apos;, &apos;name&apos;: &apos;Dianna Hohensee&apos;, &apos;username&apos;: &apos;DiannaHohensee&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30797&quot; title=&quot;Shard primaries must commit a majority write before using updated chunk routing tables&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30797&quot;&gt;&lt;del&gt;SERVER-30797&lt;/del&gt;&lt;/a&gt; Ensure shard primary is a majority primary before using updated chunk routing tables&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d5a04de30c06898b4a588f286e2ab38fcb91600f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d5a04de30c06898b4a588f286e2ab38fcb91600f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1681521" author="schwerin" created="Mon, 25 Sep 2017 23:46:55 +0000"  >&lt;p&gt;Only the new primary will be able to complete majority writes, and only nodes in the same partition as the new primary will be able to provide causally consistent majority reads following those writes.&lt;/p&gt;

&lt;p&gt;However, this fix is about ensuring that local and majority read concern only return documents as they at some point existed (majority) or were proposed to exist (local). Without it, those read concerns may erroneously return orphans, which can contain changes never proposed by a client application, albeit only in scenarios like the one described.&lt;/p&gt;</comment>
                            <comment id="1681431" author="dianna.hohensee" created="Mon, 25 Sep 2017 21:41:20 +0000"  >&lt;p&gt;To be clear, it seems like this scenario will still be pretty broken because writes (local or majority) could happen to one side of a split, then reads (local or majority) to the other side won&apos;t see the changes. Is that alright? &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=schwerin&quot; class=&quot;user-hover&quot; rel=&quot;schwerin&quot;&gt;schwerin&lt;/a&gt;&lt;/p&gt;</comment>
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