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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-60369] [txnRetryCounter] Use txnRetryCounter on router to retry on some transient errors in a client transaction</title>
                <link>https://jira.mongodb.org/browse/SERVER-60369</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, if any shard participant in a sharded transaction returns a transient error, the error is returned to the client, which will retry after incrementing the transaction number. With the introduction of txnRetryCounter in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58752&quot; title=&quot;[txnRetryCounter] Support retrying internal transactions on transient transaction errors&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58752&quot;&gt;&lt;del&gt;SERVER-58752&lt;/del&gt;&lt;/a&gt;, the router running the transaction can instead catch transient errors in some situations and retry with a higher txnRetryCounter without involving the client, improving performance.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;In this ticket, mongos will retry on all transient transaction errors encountered during the first stmt id, regardless of the number of participants involved. The mongos will start a new transaction with an incremented txnRetryCounter value, and the mongod will consider this request as a new transaction.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Note, we can revert this &lt;a href=&quot;https://github.com/10gen/mongo/commit/d85d3a3df471fbbf29459e37937161b0b55c3230#diff-851cbdc2fdf64d5d9e7ef7641a48e799927cd37280d2a08305bbb026c22757f4R969-R971&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;commit&lt;/a&gt; to readd support for the txnRetryCounter and that there are some tests that will need to be re-enabled, see comments below.&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1887351">SERVER-60369</key>
            <summary>[txnRetryCounter] Use txnRetryCounter on router to retry on some transient errors in a client transaction</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="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                    </labels>
                <created>Thu, 30 Sep 2021 20:59:23 +0000</created>
                <updated>Fri, 17 Nov 2023 22:22:37 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>1</watches>
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