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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-67402] Linearizable reads can occasionally read with wrong read source</title>
                <link>https://jira.mongodb.org/browse/SERVER-67402</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Linearizable reads are supposed to happen only on a writable primary with a read source of kNoTimestamp.  Because of a race, these reads may enter AutoGetCollectionForRead on a secondary or primary in catch-up mode.  Before &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55443&quot; title=&quot;Lock free read using linearizable read concern fasserts when issued to primary not yet accepting writes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55443&quot;&gt;&lt;del&gt;SERVER-55443&lt;/del&gt;&lt;/a&gt;, this would result in an fassert as they attempted to read at kNoTimestamp on the non-writable node.  After &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55443&quot; title=&quot;Lock free read using linearizable read concern fasserts when issued to primary not yet accepting writes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55443&quot;&gt;&lt;del&gt;SERVER-55443&lt;/del&gt;&lt;/a&gt;, there is no invariant, but they may read at kNoTimestamp on a node which is in the middle of applying oplog.  Most of the time this will fail when the node attempts to do the no-op write when the read is finished, but if the node completes step-up before that happens, it may succeed.  Because linearizable reads are supposed to be for single documents only, this should usually be OK (no inconsistency will be observable) but it is bad practice anyway.&lt;/p&gt;

&lt;p&gt;Instead of either reading at kNoTimestamp on a secondary, or hitting an fassert, a linearizable read should uassert with NotWritablePrimary when it would otherwise open a snapshot on a non-writable node.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="2073171">SERVER-67402</key>
            <summary>Linearizable reads can occasionally read with wrong read source</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="henrik.edin@mongodb.com">Henrik Edin</assignee>
                                    <reporter username="matthew.russotto@mongodb.com">Matthew Russotto</reporter>
                        <labels>
                    </labels>
                <created>Tue, 21 Jun 2022 13:45:56 +0000</created>
                <updated>Sun, 29 Oct 2023 21:36:39 +0000</updated>
                            <resolved>Mon, 8 Aug 2022 21:57:40 +0000</resolved>
                                    <version>5.0.9</version>
                    <version>6.0.0-rc10</version>
                    <version>6.1.0-rc0</version>
                                    <fixVersion>5.0.13</fixVersion>
                    <fixVersion>6.0.2</fixVersion>
                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="4831195" author="xgen-internal-githook" created="Thu, 15 Sep 2022 17:27:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Henrik Edin&apos;, &apos;email&apos;: &apos;henrik.edin@mongodb.com&apos;, &apos;username&apos;: &apos;henrikedin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67402&quot; title=&quot;Linearizable reads can occasionally read with wrong read source&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67402&quot;&gt;&lt;del&gt;SERVER-67402&lt;/del&gt;&lt;/a&gt; Fix race where linearizable read concern may read during primary catchup&lt;/p&gt;

&lt;p&gt;(cherry picked from commit f62d857f440e1340c7338d81c128d0682305f777)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fc0a572b03ef5c589f6e2f89380a83d0142bcba7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fc0a572b03ef5c589f6e2f89380a83d0142bcba7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4811819" author="xgen-internal-githook" created="Thu, 8 Sep 2022 14:45:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Henrik Edin&apos;, &apos;email&apos;: &apos;henrik.edin@mongodb.com&apos;, &apos;username&apos;: &apos;henrikedin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67402&quot; title=&quot;Linearizable reads can occasionally read with wrong read source&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67402&quot;&gt;&lt;del&gt;SERVER-67402&lt;/del&gt;&lt;/a&gt; Fix race where linearizable read concern may read during primary catchup&lt;/p&gt;

&lt;p&gt;(cherry picked from commit f62d857f440e1340c7338d81c128d0682305f777)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0f496dfbfb76cf797833058c5b81d6910557896a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0f496dfbfb76cf797833058c5b81d6910557896a&lt;/a&gt;&lt;/p&gt;</comment>
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