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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-17355] Feature Request to override client&apos;s readPreference in mongos</title>
                <link>https://jira.mongodb.org/browse/SERVER-17355</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A customer would like to be able to override the client&apos;s read preference in mongos.  They would like it to be a global setting &amp;#8211; all requests coming in would have the readPreference overrided by a setting in mongos.&lt;/p&gt;

&lt;p&gt;Talking through the request, we also considered adding a flag that would allow the client to indicate willingness to let the server override the preference, perhaps as part of connect options.&lt;/p&gt;</description>
                <environment></environment>
        <key id="185755">SERVER-17355</key>
            <summary>Feature Request to override client&apos;s readPreference in mongos</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="schwerin@mongodb.com">Andy Schwerin</assignee>
                                    <reporter username="neal.rigney">Neal Rigney</reporter>
                        <labels>
                    </labels>
                <created>Mon, 23 Feb 2015 19:43:19 +0000</created>
                <updated>Fri, 5 Jan 2018 04:48:53 +0000</updated>
                            <resolved>Fri, 17 Mar 2017 14:07:21 +0000</resolved>
                                    <version>2.6.7</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="844797" author="schwerin" created="Fri, 6 Mar 2015 14:48:07 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=neal.rigney&quot; class=&quot;user-hover&quot; rel=&quot;neal.rigney&quot;&gt;neal.rigney&lt;/a&gt;, would this default read preference be set on a single mongos or on a whole cluster?&lt;/p&gt;

&lt;p&gt;Letting mongos arbitrarily override the application&apos;s read preference is risky, because application behavior might depend on that read preference (particularly, if it depends on primary reads). I can imagine letting mongos further constrain read preferences in a way compatible with the application&apos;s request, but that gets complicated pretty fast.&lt;/p&gt;</comment>
                            <comment id="835108" author="charlie.page@10gen.com" created="Mon, 23 Feb 2015 19:48:40 +0000"  >&lt;p&gt;Having no read preference is more logical to signal that the cluster can choose to implement the request however it sees fit, rather than adding an &quot;ignore flag&quot;.  It would be desirable to keep the semantics as close as is feasible to how default write concerns are changed on replicas (where a flag to override isn&apos;t used).&lt;/p&gt;</comment>
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