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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-16548] Allow enforcement of additional custom write concern at pre-commit</title>
                <link>https://jira.mongodb.org/browse/SERVER-16548</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The write concern of secondaryThrottle can be fine tuned (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14041&quot; title=&quot;enhance secondaryThrottle parameter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14041&quot;&gt;&lt;del&gt;SERVER-14041&lt;/del&gt;&lt;/a&gt;), and is applied at pre-commit (as well as the normal w:majority WC) in case it&apos;s stronger than w:majority (or uses tags to target certain nodes) (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15591&quot; title=&quot;enforce secondaryThrottle during moveChunk commit&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15591&quot;&gt;&lt;del&gt;SERVER-15591&lt;/del&gt;&lt;/a&gt;).  However, a valid use case is a stronger/more targeted WC at pre-commit, but without slowing down the whole migration (as using secondaryThrottle would).&lt;/p&gt;

&lt;p&gt;This request is to allow a custom pre-commit write concern to be configured and applied (in addition to w:majority), i.e. similar to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14041&quot; title=&quot;enhance secondaryThrottle parameter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14041&quot;&gt;&lt;del&gt;SERVER-14041&lt;/del&gt;&lt;/a&gt;/&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15591&quot; title=&quot;enforce secondaryThrottle during moveChunk commit&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15591&quot;&gt;&lt;del&gt;SERVER-15591&lt;/del&gt;&lt;/a&gt; except only at the end of the migration, not the whole way through (which is what secondaryThrottle is).  (wtimeout should not be supported at pre-commit, since it would always be pointlessly unsafe.)&lt;/p&gt;</description>
                <environment></environment>
        <key id="174499">SERVER-16548</key>
            <summary>Allow enforcement of additional custom write concern at pre-commit</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="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="kevin.pulo@mongodb.com">Kevin Pulo</reporter>
                        <labels>
                    </labels>
                <created>Mon, 15 Dec 2014 04:04:27 +0000</created>
                <updated>Tue, 6 Dec 2022 04:58:06 +0000</updated>
                            <resolved>Wed, 22 Mar 2017 13:39:34 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1530225" author="kaloian.manassiev" created="Wed, 22 Mar 2017 13:39:19 +0000"  >&lt;p&gt;The write concern specified in &lt;tt&gt;secondaryThrottle&lt;/tt&gt; is actually what runs after every single &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.4.2/src/mongo/db/s/migration_destination_manager.cpp#L691&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;document&lt;/a&gt; being migrated. Regardless of what is specified there, we always do a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.4.2/src/mongo/db/s/migration_destination_manager.cpp#L792&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;majority write&lt;/a&gt; just before migration is committed.&lt;/p&gt;

&lt;p&gt;With the more recent performance improvements in v3.4, secondaryThrottle defaults to local write only and its only use effectively becomes just &quot;throttle&quot; and we won&apos;t be doing any further enhancements to it.&lt;/p&gt;</comment>
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            <issuekey id="162883">SERVER-15591</issuekey>
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            <issuelink>
            <issuekey id="137856">SERVER-14041</issuekey>
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            <issuelink>
            <issuekey id="171827">SERVER-16357</issuekey>
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