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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-36042] Server Selection Algorithm Causes Blocking with Causal Consistency</title>
                <link>https://jira.mongodb.org/browse/SERVER-36042</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I previously raised this as an improvement but it may also need to be considered as a bug.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35944&quot; title=&quot;Session Pinning / Server Selection Algorithm Causes Blocking with Causal Consistency&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35944&quot;&gt;SERVER-35944&lt;/a&gt; Session Pinning&lt;/p&gt;

&lt;p&gt;Implementation appears to violate updates that were due to the Max Staleness specification on the introduction of causal consistency and there is potential to impact expected performance.&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;The&#160;&lt;a href=&quot;https://github.com/mongodb/specifications/blob/master/source/server-selection/server-selection.rst&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;server selection algorithm&lt;/a&gt;&#160;randomly directs reads to different servers which causes blocking if the reads are causally dependent and the selected server has yet to apply the operations depended upon.&lt;/p&gt;&lt;/blockquote&gt;</description>
                <environment></environment>
        <key id="569689">SERVER-36042</key>
            <summary>Server Selection Algorithm Causes Blocking with Causal Consistency</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="simony">Simon Yarde</reporter>
                        <labels>
                    </labels>
                <created>Tue, 10 Jul 2018 09:16:03 +0000</created>
                <updated>Tue, 10 Jul 2018 20:03:36 +0000</updated>
                            <resolved>Tue, 10 Jul 2018 20:03:36 +0000</resolved>
                                    <version>3.6.0</version>
                    <version>4.0.0</version>
                                                    <component>Concurrency</component>
                    <component>Performance</component>
                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1943637" author="ramon.fernandez" created="Tue, 10 Jul 2018 20:03:25 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=simony&quot; class=&quot;user-hover&quot; rel=&quot;simony&quot;&gt;simony&lt;/a&gt;, we&apos;re going to close this ticket in favor of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35944&quot; title=&quot;Session Pinning / Server Selection Algorithm Causes Blocking with Causal Consistency&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35944&quot;&gt;SERVER-35944&lt;/a&gt; since it has more information.&lt;/p&gt;</comment>
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