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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-61088] [Upgrade/downgrade] Make transaction participants check if txnRetryCounter is supported during startTransaction and have mongos use it</title>
                <link>https://jira.mongodb.org/browse/SERVER-61088</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;ul&gt;
	&lt;li&gt;Make transaction participants do the following upon receiving a startTransaction statement with a &lt;em&gt;txnRetryCounter&lt;/em&gt;:
	&lt;ul&gt;
		&lt;li&gt;If the FCV is latest and the feature flag is enabled, attach &lt;em&gt;supportTxnRetryCounter:true&lt;/em&gt; to the response to the startTransaction statement. After that, the transaction must continue to use that txnRetryCounter regardless of FCV or feature flag changes.&#160;&lt;/li&gt;
		&lt;li&gt;Otherwise, attach &lt;em&gt;supportTxnRetryCounter:false&lt;/em&gt; to the response for the statement if &lt;em&gt;txnRetryCounter&lt;/em&gt;=0, or throw a TxnRetryCounterNotSupported error if &lt;em&gt;txnRetryCounter&lt;/em&gt;&amp;gt;0.&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;Remove InvalidOptions uassert for &lt;em&gt;txnRetryCounter&lt;/em&gt; from initializeOperationSessionInfo().&lt;/li&gt;
	&lt;li&gt;Remove the feature flag checks in op_observer_impl.cpp and transaction_coordinator_util.cpp, and make it such that &lt;em&gt;txnRetryCounter&lt;/em&gt; is written to &lt;em&gt;config.transactions&lt;/em&gt; and &lt;em&gt;config.transaction_coordinators&lt;/em&gt; entries and transaction oplog entries if and only if it is initialized.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Then:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Make mongos use the flag to determine if &lt;em&gt;txnRetryCounter&lt;/em&gt; should be attached in future transaction statements.&lt;/li&gt;
	&lt;li&gt;Add TxnRetryCounterNotSupported to the list of transient transaction errors so that mongos attaches the &lt;em&gt;TransientTransactionError&lt;/em&gt; label to the response to the command in the transaction that was internally retried with a non-zero txnRetryCounter.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1912605">SERVER-61088</key>
            <summary>[Upgrade/downgrade] Make transaction participants check if txnRetryCounter is supported during startTransaction and have mongos use it</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="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="jason.zhang@mongodb.com">Jason Zhang</assignee>
                                    <reporter username="cheahuychou.mao@mongodb.com">Cheahuychou Mao</reporter>
                        <labels>
                    </labels>
                <created>Thu, 28 Oct 2021 20:11:18 +0000</created>
                <updated>Sun, 29 Oct 2023 21:46:46 +0000</updated>
                            <resolved>Thu, 3 Feb 2022 20:17:26 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4333765" author="xgen-internal-githook" created="Thu, 3 Feb 2022 17:13:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jason Zhang&apos;, &apos;email&apos;: &apos;jason.zhang@mongodb.com&apos;, &apos;username&apos;: &apos;jz1242&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61088&quot; title=&quot;[Upgrade/downgrade] Make transaction participants check if txnRetryCounter is supported during startTransaction and have mongos use it&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61088&quot;&gt;&lt;del&gt;SERVER-61088&lt;/del&gt;&lt;/a&gt; Make transaction participants check if txnRetryCounter is supported during startTransaction and have mongos use it&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0e4e2c4a28fee3358ff2f0f0f102f0e8b59185d0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0e4e2c4a28fee3358ff2f0f0f102f0e8b59185d0&lt;/a&gt;&lt;/p&gt;</comment>
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                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="1912599">SERVER-61085</issuekey>
        </issuelink>
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="1912606">SERVER-61089</issuekey>
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            <issuekey id="1912606">SERVER-61089</issuekey>
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