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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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            <title>[SERVER-10014] critical section recovery check is inaccurate if SCC::findOne unexpectedly throws after preparing</title>
                <link>https://jira.mongodb.org/browse/SERVER-10014</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Note - the correct behavior here may need more discussion.&lt;/p&gt;

&lt;p&gt;If, while attempting to write the version in the critical section of a migrate, the write fails on the first (or second) server, mongod can throw an exception that is caught by the critical section recovery code (see DBClientInterface::findN, looks like the SCC::findOne does not expect this to happen).  Writes to subsequent servers are &lt;b&gt;not&lt;/b&gt; performed, potentially resulting in inconsistency.&lt;/p&gt;

&lt;p&gt;The check afterwards (which reads the version written and shuts down the server if it differs) does not catch the problem if the write to the server actually went through.  This happens in the case of config server timeout, for example.&lt;/p&gt;</description>
                <environment></environment>
        <key id="80173">SERVER-10014</key>
            <summary>critical section recovery check is inaccurate if SCC::findOne unexpectedly throws after preparing</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="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="greg_10gen">Greg Studer</reporter>
                        <labels>
                    </labels>
                <created>Mon, 24 Jun 2013 23:15:14 +0000</created>
                <updated>Tue, 6 Dec 2022 05:20:04 +0000</updated>
                            <resolved>Thu, 12 Jul 2018 18:59:24 +0000</resolved>
                                    <version>2.5.0</version>
                                                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1945937" author="greg.mckeon" created="Thu, 12 Jul 2018 18:59:24 +0000"  >&lt;p&gt;Gone away with the migration changes in 3.4.&lt;/p&gt;</comment>
                            <comment id="460427" author="greg_10gen" created="Fri, 22 Nov 2013 17:10:20 +0000"  >&lt;p&gt;Reporting what happens on all config servers after errors occur and not relying on findOne() is probably a good first step.&lt;/p&gt;</comment>
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