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    <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-23544] Race condition can allow using a SyncClusterConnection to talk to config servers even after swapping CatalogManager to CSRS mode</title>
                <link>https://jira.mongodb.org/browse/SERVER-23544</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There&apos;s a race when creating a SyncClusterConnection around the same time as another thread performs a catalog swap. Imagine you need to talk to the config server for some reason. You check whether you&apos;re in SCCC or CSRS mode and see that you are in SCCC mode, so you get ready to create a SyncClusterConnection to talk to the config servers. Before you do, however, another thread communicates with the config servers and notices the need to swap catalog managers. The catalog managers swap, then the original thread proceeds with creating the SyncClusterConnection. Normally if the config servers had switched to CSRS mode, connecting the SyncClusterConnection would fail because it would run isMaster against the first config server and see that it&apos;s mode is different than the one we&apos;re using. But in this case we&apos;ll see that the config server is in CSRS mode, and we&apos;d check what mode we&apos;re in and see that we&apos;re also in CSRS mode, so there&apos;s nothing to do! The SyncClusterConnection connects successfully and is used to run the query.&lt;/p&gt;</description>
                <environment></environment>
        <key id="277656">SERVER-23544</key>
            <summary>Race condition can allow using a SyncClusterConnection to talk to config servers even after swapping CatalogManager to CSRS mode</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="9">Done</resolution>
                                        <assignee username="spencer@mongodb.com">Spencer Brody</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                            <label>code-only</label>
                            <label>csrsupgrade</label>
                    </labels>
                <created>Tue, 5 Apr 2016 19:15:34 +0000</created>
                <updated>Wed, 25 Jan 2017 21:59:00 +0000</updated>
                            <resolved>Thu, 14 Apr 2016 18:09:46 +0000</resolved>
                                    <version>3.3.4</version>
                                    <fixVersion>3.2.6</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1236136" author="xgen-internal-githook" created="Thu, 14 Apr 2016 18:05:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;stbrody&apos;, u&apos;name&apos;: u&apos;Spencer T Brody&apos;, u&apos;email&apos;: u&apos;spencer@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23544&quot; title=&quot;Race condition can allow using a SyncClusterConnection to talk to config servers even after swapping CatalogManager to CSRS mode&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23544&quot;&gt;&lt;del&gt;SERVER-23544&lt;/del&gt;&lt;/a&gt; Always fail to create SyncClusterConnections after CatalogManager swap to CSRS mode&lt;br/&gt;
Branch: v3.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/697f8f1bc8572ee3c74869223f5753a0bd0e46c9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/697f8f1bc8572ee3c74869223f5753a0bd0e46c9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1226639" author="spencer" created="Tue, 5 Apr 2016 19:17:29 +0000"  >&lt;p&gt;Proposed fix is to change the connection hook to always fail to connect if the connection being made is part of a SyncClusterConnection and the config server reports it&apos;s in csrs mode.&lt;/p&gt;</comment>
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