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    <title>MongoDB Jira</title>
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    <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-33477] Update session entry with _id upsert</title>
                <link>https://jira.mongodb.org/browse/SERVER-33477</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When migration thread updates the session table while the session has been checked out by a retryable write, only one of them will succeed due to the write conflict on the same _id (session id). Compare-and-swap style update and generating WCE manually seems unnecessary because storage engine should be able to generate those WriteConflictExceptions.&lt;/p&gt;

&lt;p&gt;This issue makes more than one write with snapshot isolation throw WCE because the in-memory &lt;tt&gt;_lastWrittenSessionRecord&lt;/tt&gt; will be updated at the commit time of the transaction and is out of sync after the first write. CAS update cannot find the expected (stale) original doc.&lt;/p&gt;

&lt;p&gt;When multi-statement transaction is implemented this won&apos;t be a problem since we don&apos;t support retryable writes for operations during a transaction. But I still think it&apos;s an opportunity to improve the code. Another benefit is to use idHack in query planning, which doesn&apos;t have the CAS update performance issue in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31845&quot; title=&quot;WT performance regression with write retryability enabled&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31845&quot;&gt;&lt;del&gt;SERVER-31845&lt;/del&gt;&lt;/a&gt; and keeps the code clearer.&lt;/p&gt;</description>
                <environment></environment>
        <key id="501908">SERVER-33477</key>
            <summary>Update session entry with _id upsert</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="13201">Fixed</resolution>
                                        <assignee username="siyuan.zhou@mongodb.com">Siyuan Zhou</assignee>
                                    <reporter username="siyuan.zhou@mongodb.com">Siyuan Zhou</reporter>
                        <labels>
                    </labels>
                <created>Sat, 24 Feb 2018 01:01:50 +0000</created>
                <updated>Sun, 29 Oct 2023 22:34:27 +0000</updated>
                            <resolved>Mon, 26 Feb 2018 21:48:41 +0000</resolved>
                                                    <fixVersion>3.7.3</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1816562" author="xgen-internal-githook" created="Mon, 26 Feb 2018 21:47:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;siyuan.zhou@mongodb.com&apos;, &apos;name&apos;: &apos;Siyuan Zhou&apos;, &apos;username&apos;: &apos;visualzhou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33477&quot; title=&quot;Update session entry with _id upsert&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33477&quot;&gt;&lt;del&gt;SERVER-33477&lt;/del&gt;&lt;/a&gt; Always use upsert with _id for session update.&lt;/p&gt;

&lt;p&gt;Transactions stash the writes so the in-memory state of transaction&lt;br/&gt;
table is out of sync during transaction. Two threads (write and chunk&lt;br/&gt;
migration) will not update the same session entry due to the WCE&lt;br/&gt;
generated by storage engine.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/84da063a67fee56e7e088891dc170fd8dee4147e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/84da063a67fee56e7e088891dc170fd8dee4147e&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="495451">SERVER-33215</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="500847">SERVER-33430</issuekey>
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