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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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            <title>[SERVER-40783] For a transaction that requires two-phase commit due to multiple write shards, omit read-only shards from having to do prepare</title>
                <link>https://jira.mongodb.org/browse/SERVER-40783</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For a transaction that requires two-phase commit due to multiple write shards, omit read-only shards from having to do prepare.&lt;/p&gt;

&lt;p&gt;(Also, the following should also be done as part of this ticket, from previous &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41356&quot; title=&quot;Always choose a write shard as the transaction two-phase commit coordinator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41356&quot;&gt;&lt;del&gt;SERVER-41356&lt;/del&gt;&lt;/a&gt; which should have been part of this)&lt;/p&gt;

&lt;p&gt;Currently, the first participant is chosen as the two-phase commit coordinator. This means that if that participant ends up being read-only, the two-phase commit will not have the benefit of any of the participants being local.&lt;/p&gt;

&lt;p&gt;This would only improve the tail latency of two-phase commit.&lt;/p&gt;

&lt;p&gt;It is slightly complicated because in order to choose a write shard, the router has to first know whether the participant has done a write, which means the router cannot piggyback &quot;coordinator: true&quot; on the&#160;&lt;b&gt;request&lt;/b&gt;&#160;to the participant.&lt;/p&gt;</description>
                <environment></environment>
        <key id="743716">SERVER-40783</key>
            <summary>For a transaction that requires two-phase commit due to multiple write shards, omit read-only shards from having to do prepare</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-cluster-scalability">Backlog - Cluster Scalability</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                            <label>ShardedTxn:FutureOptimizations</label>
                            <label>pm-564</label>
                            <label>sharding-common-backlog</label>
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                <created>Tue, 23 Apr 2019 16:52:39 +0000</created>
                <updated>Tue, 12 Dec 2023 15:49:50 +0000</updated>
                                                                            <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
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