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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-34207] Restore _txnState to kNone before returning SnapshotTooOld error</title>
                <link>https://jira.mongodb.org/browse/SERVER-34207</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When &lt;tt&gt;Session::unstashTransactionResources()&lt;/tt&gt; throws a &lt;tt&gt;SnapshotTooOld&lt;/tt&gt; error, we do not abort the transaction, since &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/service_entry_point_common.cpp#L419&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;unstashTransactionResources()&lt;/tt&gt; is not within the &lt;tt&gt;ScopeGuard&lt;/tt&gt; that aborts the transaction&lt;/a&gt;. However, if the command was part of a multi-statement transaction, we leave the &lt;tt&gt;Session&lt;/tt&gt; in a state where &lt;tt&gt;_txnState=kInProgress&lt;/tt&gt; and &lt;tt&gt;_txnResourceStash&lt;/tt&gt; is empty. This is an inconsistent state for the &lt;tt&gt;Session&lt;/tt&gt;. It also means that when the mongos retries the first statement of the transaction, it must leave off the &lt;tt&gt;startTransaction&lt;/tt&gt; argument, since the transaction is already in progress (which is incorrect). Instead, when we return a &lt;tt&gt;SnapshotTooOld&lt;/tt&gt; error, we should &quot;forget&quot; that the current transaction ever happened, so that the mongos can retry with &lt;tt&gt;startTransaction:true&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="519265">SERVER-34207</key>
            <summary>Restore _txnState to kNone before returning SnapshotTooOld error</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="13203">Gone away</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
                    </labels>
                <created>Fri, 30 Mar 2018 13:44:52 +0000</created>
                <updated>Fri, 27 Oct 2023 20:43:30 +0000</updated>
                            <resolved>Tue, 17 Apr 2018 20:52:59 +0000</resolved>
                                                                    <component>Internal Code</component>
                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1850040" author="tess.avitabile" created="Fri, 30 Mar 2018 13:46:58 +0000"  >&lt;p&gt;I did not end up having to fix this issue in order to re-commit &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34011&quot; title=&quot;Concurrency between transaction and other threads that can abort transaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34011&quot;&gt;&lt;del&gt;SERVER-34011&lt;/del&gt;&lt;/a&gt;, since the mongos is actually able to retry snapshot reads after receiving &lt;tt&gt;SnapshotTooOld&lt;/tt&gt;. The issue there was that &lt;tt&gt;StaleEpoch&lt;/tt&gt; errors aborted the transaction, and the mongos was unable to retry. The Sharding team is intending to address that issue.&lt;/p&gt;</comment>
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