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    <title>MongoDB Jira</title>
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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-41455] Support running $out or $merge from a secondary with writes to the primary</title>
                <link>https://jira.mongodb.org/browse/SERVER-41455</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It should be possible to perform reads from a secondary node and send the writes to the primary. If the read part of a pipeline is expensive but the write is not so expensive, this could help decrease load on the primary.&lt;/p&gt;</description>
                <environment></environment>
        <key id="787287">SERVER-41455</key>
            <summary>Support running $out or $merge from a secondary with writes to the primary</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Mon, 3 Jun 2019 14:46:59 +0000</created>
                <updated>Sun, 29 Oct 2023 22:20:28 +0000</updated>
                            <resolved>Mon, 20 Apr 2020 23:09:31 +0000</resolved>
                                                    <fixVersion>4.4.0-rc0</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>1</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="3048294" author="david.storch" created="Mon, 20 Apr 2020 23:09:31 +0000"  >&lt;p&gt;This work was completed in 4.4 over a series of commits. Therefore, I&apos;m closing this umbrella ticket as fixed in 4.4.0-rc0 despite there being no specific commits against it.&lt;/p&gt;

&lt;p&gt;If a client sends an &lt;tt&gt;aggregate&lt;/tt&gt; command with &lt;tt&gt;$out&lt;/tt&gt; or &lt;tt&gt;$merge&lt;/tt&gt; to a replica set secondary in a FCV &quot;4.4&quot; deployment, and provides a non-primary read preference, then the query will be computed on the secondary node but will direct any write operations to the primary node. (In a sharded scenario, writes may be directed to the primary nodes of multiple shards.) In previous versions, such operations would fail uncleanly, and so drivers would never direct &lt;tt&gt;$out&lt;/tt&gt; or &lt;tt&gt;$merge&lt;/tt&gt; operations to replica set secondaries. Note that as of this writing, drivers have not done the work to expose this new feature to applications. Drivers may choose to only expose &lt;tt&gt;$out&lt;/tt&gt;/&lt;tt&gt;$merge&lt;/tt&gt; on secondaries starting in 4.6 in order to simply handling of the 4.2/4.4 upgrade/downgrade process.&lt;/p&gt;</comment>
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            <issuekey id="787956">DRIVERS-868</issuekey>
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            <issuekey id="1323495">DOCS-13605</issuekey>
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                                                                <inwardlinks description="is related to">
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            <issuekey id="67390">SERVER-8853</issuekey>
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            <issuelink>
            <issuekey id="210923">SERVER-18992</issuekey>
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                            <customfieldvalue>The downstream impact of this change was likely already considered as part of PM-1770, but I&amp;#39;m marking this as having downstream impact for completeness. Drivers need to do work to expose this feature to applications, but I believe that this work has been deferred until the 4.6 compatible driver releases. The feature should be documented, but I believe we are waiting to document it until driver support lands.</customfieldvalue>

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