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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-43309] Transaction eagerly locks document causing WriteConflict</title>
                <link>https://jira.mongodb.org/browse/SERVER-43309</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;mongodb&#160;server&#160;4.0.3&lt;br/&gt;
npm&#160;client&#160;mongodb&#160;3.3.1&lt;br/&gt;
&#160;&lt;br/&gt;
When two sessions are trying to update the same document, if the first session updates the document, attempt by the second session to update the document will fail with WriteConflict, &lt;b&gt;even if the first session has not committed the transaction yet&lt;/b&gt;.&lt;br/&gt;
&#160;&lt;br/&gt;
Attached is code sample which reproduces this case. The sample code prints numbers so you can see which line of code causes the WriteConflict.&lt;br/&gt;
&#160;&lt;br/&gt;
I believe this is a bug because imagine if the &lt;tt&gt;aliceSession&lt;/tt&gt; will throw an error before ever committing the transaction. Why should &lt;tt&gt;bobSession&lt;/tt&gt; be punished with a &lt;tt&gt;WriteConfilct&lt;/tt&gt;&#160;when &lt;tt&gt;aliceSession&lt;/tt&gt; will never commit?&lt;/p&gt;</description>
                <environment></environment>
        <key id="925119">SERVER-43309</key>
            <summary>Transaction eagerly locks document causing WriteConflict</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="13202">Works as Designed</resolution>
                                        <assignee username="daniel.hatcher@mongodb.com">Danny Hatcher</assignee>
                                    <reporter username="ronald@battlefy.com">Ronald Chen</reporter>
                        <labels>
                    </labels>
                <created>Fri, 13 Sep 2019 02:07:59 +0000</created>
                <updated>Fri, 27 Oct 2023 13:53:05 +0000</updated>
                            <resolved>Fri, 13 Sep 2019 17:18:58 +0000</resolved>
                                    <version>4.0.3</version>
                                                    <component>Concurrency</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="2419838" author="daniel.hatcher" created="Fri, 13 Sep 2019 17:18:50 +0000"  >&lt;p&gt;Snapshot isolation guarantees that every transaction, conceptually, runs against its own, consistent &quot;snapshot&quot; of the database, which reflects the effects of all previously committed transactions. Every transaction performs its reads and writes against this snapshot, adjusting for the effects of any writes executed inside the transaction. Snapshot isolation enforces a policy for serializing writes between transactions known as the &quot;First Updater Wins&quot; rule. Intuitively, this rule states that concurrent transactions are not allowed to write to the same document. Transactions under snapshot isolation are defined to be &quot;concurrent&quot; if their transactional lifetimes overlap. The rule is enforced via an optimistic concurrency control mechanism, as opposed to a pessimistic one i.e. locking the document. If two concurrent transactions T1 and T2 write to the same document, only the first writer will succeed. So, for example, if transaction T2 tries to write to a document already written to by T1 this will cause T2&apos;s write to fail with a &quot;WriteConflict&quot; error, and transaction T2 will be aborted.&lt;/p&gt;

&lt;p&gt;Given the above, this functionality is working as designed and we would expect to see a write conflict in your test case. As such, I will close this ticket.&lt;/p&gt;</comment>
                            <comment id="2418983" author="ronald@battlefy.com" created="Fri, 13 Sep 2019 02:11:36 +0000"  >&lt;p&gt;another reason why I consider this a bug is the writes are observable by other sessions before they are committed&lt;/p&gt;</comment>
                            <comment id="2418982" author="ronald@battlefy.com" created="Fri, 13 Sep 2019 02:08:50 +0000"  >&lt;p&gt;btw, sample code was using&lt;/p&gt;

&lt;p&gt;node&#160;v10.15.3&lt;/p&gt;

&lt;p&gt;npm&#160;6.4.1&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="230693" name="tx-eagerly-locks.js" size="1514" author="ronald@battlefy.com" created="Fri, 13 Sep 2019 02:01:14 +0000"/>
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                            <customfieldvalue>&lt;p&gt;Run attached file.&lt;/p&gt;

&lt;p&gt;Expected, &lt;tt&gt;some-event&lt;/tt&gt; state updated to &lt;tt&gt;right&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;Actual, output&lt;/p&gt;
&lt;p/&gt;
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