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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-41356] Always choose a write shard as the transaction two-phase commit coordinator</title>
                <link>https://jira.mongodb.org/browse/SERVER-41356</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&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 &lt;b&gt;request&lt;/b&gt; to the participant.&lt;/p&gt;</description>
                <environment></environment>
        <key id="780780">SERVER-41356</key>
            <summary>Always choose a write shard as the transaction two-phase commit coordinator</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="3">Duplicate</resolution>
                                        <assignee username="adi.zaimi@mongodb.com">Adi Zaimi</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                            <label>ShardedTxn:FutureOptimizations</label>
                            <label>sharding-common-backlog</label>
                            <label>sharding-nyc-subteam3</label>
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                <created>Wed, 29 May 2019 14:34:31 +0000</created>
                <updated>Tue, 24 Jan 2023 16:56:37 +0000</updated>
                            <resolved>Tue, 24 Jan 2023 16:54:44 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5136796" author="JIRAUSER1261874" created="Tue, 24 Jan 2023 16:54:44 +0000"  >&lt;p&gt;Will be done as part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40783&quot; title=&quot;For a transaction that requires two-phase commit due to multiple write shards, omit read-only shards from having to do prepare&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40783&quot;&gt;SERVER-40783&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="5118135" author="JIRAUSER1261874" created="Tue, 17 Jan 2023 17:00:38 +0000"  >&lt;p&gt;Need to discuss with Max/Jack to clarify if this is any longer applicable. Today we presumably commit the txn in the shards that performed only a read as part of txn, and if that will remain so then this tkt is obsolete.&lt;br/&gt;
If we are planning to add back optimization that only write shards commit the txn, then we may need to put this tkt back in the backlog.&lt;/p&gt;</comment>
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