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    <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-47029] Fix race when streamable RSM updates the shard registry after topology change</title>
                <link>https://jira.mongodb.org/browse/SERVER-47029</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;From BF description:&lt;br/&gt;
There is a race when updating the ShardRegistry/config.shards on mongos. Mongos gets an isMaster response from two different nodes (node0, node1) in the same replica set after node0 was removed. Node0 sends its response first and includes itself in the response with type &apos;ghost&apos; and node1 does not include this node in the response at all. Mongos updates the topology description with the response from node0 and then does the same with the second response from node1, then calls onConfirmedSet on the ReplicaSetChangeNotifier. This causes the shard registry to update its info for this repl set and write to config.shards, but the second notifier event (triggered by the response from node1) reaches the shard registry first and then the event triggered by node0. This means we first write that the replica set only has two nodes, and then overwrite it and include the removed node.&lt;/p&gt;

&lt;p&gt;A possible fix is to not include nodes that are not primaries/secondaries in the connection string passed to the shard registry.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1284403">SERVER-47029</key>
            <summary>Fix race when streamable RSM updates the shard registry after topology change</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="lamont.nelson@mongodb.com">Lamont Nelson</assignee>
                                    <reporter username="janna.golden@mongodb.com">Janna Golden</reporter>
                        <labels>
                    </labels>
                <created>Fri, 20 Mar 2020 21:16:29 +0000</created>
                <updated>Sun, 29 Oct 2023 22:10:29 +0000</updated>
                            <resolved>Mon, 23 Mar 2020 21:17:14 +0000</resolved>
                                                    <fixVersion>4.4.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2993046" author="xgen-internal-githook" created="Mon, 23 Mar 2020 20:52:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;lamont.nelson@mongodb.com&apos;, &apos;name&apos;: &apos;Lamont Nelson&apos;, &apos;username&apos;: &apos;lamontnelson&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47029&quot; title=&quot;Fix race when streamable RSM updates the shard registry after topology change&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47029&quot;&gt;&lt;del&gt;SERVER-47029&lt;/del&gt;&lt;/a&gt;: add only confirmed nodes when publishing onConfirmedSet; include best effort guess when nothing has been confirmed yet.&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/55549b3383e36b6b5646354c3e0a7519add48e5d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/55549b3383e36b6b5646354c3e0a7519add48e5d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2992798" author="xgen-internal-githook" created="Mon, 23 Mar 2020 19:41:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Lamont Nelson&apos;, &apos;username&apos;: &apos;lamontnelson&apos;, &apos;email&apos;: &apos;lamont.nelson@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47029&quot; title=&quot;Fix race when streamable RSM updates the shard registry after topology change&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47029&quot;&gt;&lt;del&gt;SERVER-47029&lt;/del&gt;&lt;/a&gt;: add only confirmed nodes when publishing onConfirmedSet; include best effort guess when nothing has been confirmed yet.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/44564015b0a8c4ae65b876dbb06e0a95f5a6d876&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/44564015b0a8c4ae65b876dbb06e0a95f5a6d876&lt;/a&gt;&lt;/p&gt;</comment>
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