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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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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-18285] Support linearizable reads on replica set primaries</title>
                <link>https://jira.mongodb.org/browse/SERVER-18285</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This would be an alternative to using findAndModify + writeConcern, as described in &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-5324&quot; title=&quot;Document how to use findAndModify with write concern to achieve &amp;quot;quorum read&amp;quot; behavior&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-5324&quot;&gt;&lt;del&gt;DOCS-5324&lt;/del&gt;&lt;/a&gt;, to do quorum reads.  A correct implementation would tie quorum reads into the replication machinery.&lt;/p&gt;</description>
                <environment></environment>
        <key id="201397">SERVER-18285</key>
            <summary>Support linearizable reads on replica set primaries</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="schwerin@mongodb.com">Andy Schwerin</assignee>
                                    <reporter username="schwerin@mongodb.com">Andy Schwerin</reporter>
                        <labels>
                    </labels>
                <created>Thu, 30 Apr 2015 22:53:44 +0000</created>
                <updated>Wed, 25 Jan 2017 22:00:57 +0000</updated>
                            <resolved>Mon, 7 Nov 2016 15:08:49 +0000</resolved>
                                                    <fixVersion>3.4.0-rc3</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>21</watches>
                                                                                                                <comments>
                            <comment id="1427905" author="schwerin" created="Mon, 7 Nov 2016 15:08:49 +0000"  >&lt;p&gt;The work to support this was done under a number of task tickets, primarily  &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-24497&quot; title=&quot;implement noop writes to test for primary-ship &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-24497&quot;&gt;&lt;del&gt;SERVER-24497&lt;/del&gt;&lt;/a&gt;. The technique employed to ensure that the primary answering a read is still capable of committing writes is to inject no-op writes as needed to ensure that the commit time advances appropriately during read servicing.&lt;/p&gt;

&lt;p&gt;Among other testing, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-24509&quot; title=&quot;Jepsen tests for Linearizable reads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-24509&quot;&gt;&lt;del&gt;SERVER-24509&lt;/del&gt;&lt;/a&gt; introduces regular, automatic testing of linearizable single-document reads using &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=aphyr&quot; class=&quot;user-hover&quot; rel=&quot;aphyr&quot;&gt;aphyr&lt;/a&gt;&apos;s &lt;a href=&quot;http://jepsen.io/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Jespen&lt;/a&gt; tool. At time of writing, &lt;a href=&quot;https://evergreen.mongodb.com/build_variant/mongodb-mongo-master/ubuntu1404-jepsen&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this link&lt;/a&gt; shows recent executions of the tests against the mongodb unstable development branch.&lt;/p&gt;</comment>
                            <comment id="947378" author="carstenklein@yahoo.de" created="Mon, 22 Jun 2015 20:25:37 +0000"  >&lt;p&gt;Please do incorporate mechanisms for failing reads based on untimely replication due to network latency or overall system i/o latency instead of prolonging client requests until the data becomes available.&lt;/p&gt;</comment>
                    </comments>
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="195242">SERVER-17975</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="295939">JAVA-2233</issuekey>
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