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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-38134] Ensure config.transactions and TransactionParticipant have consistent state after every command</title>
                <link>https://jira.mongodb.org/browse/SERVER-38134</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We require that &lt;tt&gt;config.transactions&lt;/tt&gt; and &lt;tt&gt;TransactionParticipant&lt;/tt&gt; have consistent state after every command (or the session is invalidated) so that subsequent users of &lt;tt&gt;TransactionParticipant&lt;/tt&gt; know whether the session needs to be reloaded from disk. We will always update &lt;tt&gt;config.transactions&lt;/tt&gt; before updating the in-memory state in &lt;tt&gt;TransactionParticipant&lt;/tt&gt;. If we throw an exception before updating the in-memory state, we must invalidate the session. Audit all abort, commit, and prepare codepaths to ensure they follow this pattern&lt;/p&gt;</description>
                <environment></environment>
        <key id="633973">SERVER-38134</key>
            <summary>Ensure config.transactions and TransactionParticipant have consistent state after every command</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="13202">Works as Designed</resolution>
                                        <assignee username="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
                            <label>prepare_errors</label>
                    </labels>
                <created>Wed, 14 Nov 2018 20:54:54 +0000</created>
                <updated>Fri, 27 Oct 2023 13:53:25 +0000</updated>
                            <resolved>Tue, 12 Feb 2019 19:06:16 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2146334" author="renctan" created="Tue, 12 Feb 2019 19:05:55 +0000"  >&lt;p&gt;prepare:&lt;br/&gt;
If something throws an exception before prepare completes, the abort guard will get triggered and abort the transaction.&lt;/p&gt;

&lt;p&gt;commit prepared:&lt;br/&gt;
After the sanity checks, the entire block is wrapped in a try catch block that terminates if it catches any exception.&lt;/p&gt;</comment>
                            <comment id="2134194" author="renctan" created="Thu, 31 Jan 2019 23:05:19 +0000"  >&lt;p&gt;Commit unprepared:&lt;br/&gt;
SImilar to abort, update happens while mutex is released but session is checked out. Also no non-fatal early returns before setting the _state variable (other than txnNumber being no longer active).&lt;/p&gt;</comment>
                            <comment id="2132755" author="renctan" created="Wed, 30 Jan 2019 23:03:30 +0000"  >&lt;p&gt;As of 02a532609f5e4b5c7cde64a4f0444cb5dc0dcb3e.&lt;/p&gt;

&lt;p&gt;abort command:&lt;br/&gt;
Update to config.transactions occur at opObserver onTransactionAbort, while TransactionParticipant mutex is released. The TxnParticipant in memory lastWriteTS gets updated during the RecoveryUnit (of the config.transaction update) onCommit callback, also while TxnParticipant mutex is released. However, session is still checked out, so no other thread (like migration, TxnRepaer) can modify the TxnParticipant. It then grabs the mutex again and tries to set the TxnParticipant state to abort. In between the config.txn update and TxnParticipant update, there are no non-fatal early returns that would leave the TxnParticipant usable but out-of-sync.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="633970">SERVER-38132</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="633972">SERVER-38133</issuekey>
        </issuelink>
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="714029">SERVER-40051</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="633976">SERVER-38135</issuekey>
        </issuelink>
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