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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-21315] Make sure to cleanup state transition on failed dist lock acquisitions on legacy config servers</title>
                <link>https://jira.mongodb.org/browse/SERVER-21315</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is to avoid the race as described below:&lt;/p&gt;

&lt;p&gt;1. Alice tries to get lock, generates a ts of TSa.&lt;br/&gt;
2. Alice got descheduled.&lt;br/&gt;
3. Bob tries to get lock, generates a ts of TSb. Note: TSb &amp;gt; TSa.&lt;br/&gt;
4. Bob successfully grabs the lock sets the state to 2 (&quot;locked&quot;) for all 3 config server.&lt;br/&gt;
5. Bob is done and tries to unlock the lock.&lt;br/&gt;
6. Bob finished unlocking the first config server and set the state to 0 (&quot;unlocked&quot;)&lt;br/&gt;
7. Alice comes back again, sees that lock state of first config server is 0, proceeds to attempt to acquire the lock by sending the update to set state to 1 (&quot;transition to lock&quot;) to all 3 config server.&lt;br/&gt;
8. Alice finds out that the update did not apply successfully to all config server (this is because the update query only matches the first config, who has the state at 0).&lt;br/&gt;
9. Alice goes to the tournament round and compares the ts field of the lock document in all config servers.&lt;br/&gt;
10. Alice sees that TSb &amp;gt; TSa, so she backs out of the tournament round.&lt;br/&gt;
11. Bob proceeds on unlocking the locks in the 2 other config servers.&lt;br/&gt;
12. The final state of the lock document ends up with:&lt;/p&gt;

&lt;p&gt;server1: state: 1, ts: TSa&lt;br/&gt;
server2: state: 0&lt;br/&gt;
server3: state: 0&lt;/p&gt;

&lt;p&gt;Once it ends up with this state, this lock can never be taken back again, until Alice&apos;s process stops pinging.&lt;/p&gt;</description>
                <environment></environment>
        <key id="238037">SERVER-21315</key>
            <summary>Make sure to cleanup state transition on failed dist lock acquisitions on legacy config servers</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="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Thu, 5 Nov 2015 20:26:43 +0000</created>
                <updated>Wed, 25 Jan 2017 21:59:40 +0000</updated>
                            <resolved>Fri, 6 Nov 2015 21:06:36 +0000</resolved>
                                    <version>3.2.0-rc2</version>
                                    <fixVersion>3.2.0-rc3</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1082227" author="xgen-internal-githook" created="Fri, 6 Nov 2015 21:03:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;renctan&apos;, u&apos;name&apos;: u&apos;Randolph Tan&apos;, u&apos;email&apos;: u&apos;randolph@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21315&quot; title=&quot;Make sure to cleanup state transition on failed dist lock acquisitions on legacy config servers&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21315&quot;&gt;&lt;del&gt;SERVER-21315&lt;/del&gt;&lt;/a&gt; Make sure to cleanup state transition on failed dist lock acquisitions on legacy config servers&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c4d2fd393eec1141caf88b7d68d3b12a65ae40c1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c4d2fd393eec1141caf88b7d68d3b12a65ae40c1&lt;/a&gt;&lt;/p&gt;</comment>
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