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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>[DOCS-12204] Docs for SERVER-36587: Committing a transaction which was started with a killCursors command can fail</title>
                <link>https://jira.mongodb.org/browse/DOCS-12204</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;
&lt;blockquote&gt;
&lt;h3&gt;&lt;a name=&quot;Description%3A&quot;&gt;&lt;/a&gt;Description: &lt;/h3&gt;

&lt;p&gt;We are disallowing killCursors to be the first operation in a transaction&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;EngineeringTicketDescription%3A&quot;&gt;&lt;/a&gt;Engineering Ticket Description:&lt;/h3&gt;

&lt;p&gt;&lt;tt&gt;AsyncResultsMerger::blockingKill()&lt;/tt&gt; sends a &lt;tt&gt;killCursors&lt;/tt&gt; command to each of its remotes. However, it &lt;a href=&quot;https://github.com/mongodb/mongo/blob/dd9cde58aefccf634322bfc662cb7f6980f6c1d2/src/mongo/s/query/async_results_merger.cpp#L686&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;discards the callback handle for the request&lt;/a&gt;, so &lt;tt&gt;blockingKill()&lt;/tt&gt; can return before the &lt;tt&gt;killCursors&lt;/tt&gt; command reaches the remote. This means that if the client issues a &lt;tt&gt;killCursors&lt;/tt&gt; command, and then a &lt;tt&gt;commitTransaction&lt;/tt&gt; command, a shard can receive the &lt;tt&gt;commitTransaction&lt;/tt&gt; before the &lt;tt&gt;killCursors&lt;/tt&gt;. This is problematic in combination with transactions. Consider the following sequence of events:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;User starts transaction 0 with &lt;tt&gt;killCursors&lt;/tt&gt; sent to mongos.&lt;/li&gt;
	&lt;li&gt;User receives ok response.&lt;/li&gt;
	&lt;li&gt;User sends &lt;tt&gt;commitTransaction&lt;/tt&gt; for transaction 0 to mongos.&lt;/li&gt;
	&lt;li&gt;mongod receives &lt;tt&gt;commitTransaction&lt;/tt&gt;, which fails since transaction 0 does not yet exist.&lt;/li&gt;
	&lt;li&gt;mongod receives &lt;tt&gt;killCursors&lt;/tt&gt;, which starts transaction 0.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Now the mongod is stuck with transaction 0 open.&lt;/p&gt;&lt;/blockquote&gt;

&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="634822">DOCS-12204</key>
            <summary>Docs for SERVER-36587: Committing a transaction which was started with a killCursors command can fail</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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="kay.kim@mongodb.com">Kay Kim</reporter>
                        <labels>
                            <label>docs-txns</label>
                    </labels>
                <created>Thu, 15 Nov 2018 23:41:57 +0000</created>
                <updated>Mon, 13 Nov 2023 18:29:01 +0000</updated>
                            <resolved>Tue, 21 May 2019 19:50:33 +0000</resolved>
                                                    <fixVersion>4.1.6</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2254915" author="xgen-internal-githook" created="Tue, 21 May 2019 19:49:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12204&quot; title=&quot;Docs for SERVER-36587: Committing a transaction which was started with a killCursors command can fail&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12204&quot;&gt;&lt;del&gt;DOCS-12204&lt;/del&gt;&lt;/a&gt;: 4.2 killOp restriction in transactions&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/8d748a2340829ff0c1e15241d5c48a2c4ff428f2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/8d748a2340829ff0c1e15241d5c48a2c4ff428f2&lt;/a&gt;&lt;/p&gt;</comment>
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                            <issuelinktype id="10320">
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            <issuekey id="586583">SERVER-36587</issuekey>
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                            <issuelinktype id="10012">
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            <issuekey id="709021">DOCS-12523</issuekey>
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