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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-26155] DistLockManager on config server should not do &apos;majority&apos; reads</title>
                <link>https://jira.mongodb.org/browse/SERVER-26155</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The dist lock manager used on the config server does read concern &apos;majority&apos; reads against the instance on which it is running.&lt;/p&gt;

&lt;p&gt;While this is not a correctness problem, it may cause deadlock when used from internal threads, because locally done reads do not obey the operation deadline when waiting for RC majority and also because internal threads are not interrupted on step down.&lt;/p&gt;

&lt;p&gt;This is evidenced by a deadlock on balancer shutdown with the following order of events:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Node becomes primary and balancer thread is started&lt;/li&gt;
	&lt;li&gt;Node steps down just before the balancer thread manages to wait for RC majority as part of the balancer dist lock overtake&lt;/li&gt;
	&lt;li&gt;Node steps down, but balancer thread continues to wait for majority RC&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Left in the state above, that node cannot become primary again, without ever becoming secondary, because the balancer thread is stuck.&lt;/p&gt;</description>
                <environment></environment>
        <key id="317018">SERVER-26155</key>
            <summary>DistLockManager on config server should not do &apos;majority&apos; reads</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="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Sun, 18 Sep 2016 23:14:58 +0000</created>
                <updated>Tue, 20 Sep 2016 20:58:35 +0000</updated>
                            <resolved>Tue, 20 Sep 2016 20:58:35 +0000</resolved>
                                    <version>3.3.12</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1389231" author="xgen-internal-githook" created="Tue, 20 Sep 2016 20:44:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26155&quot; title=&quot;DistLockManager on config server should not do &amp;#39;majority&amp;#39; reads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26155&quot;&gt;&lt;del&gt;SERVER-26155&lt;/del&gt;&lt;/a&gt; Use read concern &apos;local&apos; for dist lock manager on the config server&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit aed4f47200abff44605fc39f078601ebb0c316c7.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5ad451cf32d8b42f9f7ae0ca61dbb7dff94c875d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5ad451cf32d8b42f9f7ae0ca61dbb7dff94c875d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1387866" author="xgen-internal-githook" created="Mon, 19 Sep 2016 18:36:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26155&quot; title=&quot;DistLockManager on config server should not do &amp;#39;majority&amp;#39; reads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26155&quot;&gt;&lt;del&gt;SERVER-26155&lt;/del&gt;&lt;/a&gt; Use read concern &apos;local&apos; for dist lock manager on the config server&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/aed4f47200abff44605fc39f078601ebb0c316c7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/aed4f47200abff44605fc39f078601ebb0c316c7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1387159" author="kaloian.manassiev" created="Sun, 18 Sep 2016 23:16:50 +0000"  >&lt;p&gt;Since all reads performed by the local dist lock catalog are always on the primary node and are followed up by a majority write, a proposed solution is to make these reads always use a local write concern.&lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="317467">SERVER-26185</issuekey>
        </issuelink>
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