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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-36259] Allow aggregations with $out to be run in a transaction when the &quot;mode&quot; does not perform DDL operations</title>
                <link>https://jira.mongodb.org/browse/SERVER-36259</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;With &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35897&quot; title=&quot;Support dropTarget false in $out&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35897&quot;&gt;&lt;del&gt;SERVER-35897&lt;/del&gt;&lt;/a&gt; complete, we have the ability to perform a $out in a way that performs no catalog changes (i.e. no collection drops or renames). In theory, this should allow us to allow an aggregation $out in a transaction as long as we run in one of those modes.&lt;/p&gt;

&lt;p&gt;This ticket will track work to simply &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d179b063b233f970b30acae8fbc53f33f7d60806/src/mongo/db/pipeline/document_source_out.cpp#L159-L161&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;remove the prohibition of $out in a transaction&lt;/a&gt; as long as the &quot;mode&quot; is compatible. We&apos;ll also write tests that exercise this behavior as appropriate.&lt;/p&gt;

&lt;p&gt;(Currently, we plan to use the DBDirectClient and the ClusterWriter to perform writes inside of $out. We will have to investigate whether this will work in a transaction. One concern is the risk of a deadlock on checking out the session or stashed transaction resources, especially with the DBDirectClient. We may have to either unstash resources or refactor the code in a way that does not depend on the DBDirectClient.)&lt;/p&gt;</description>
                <environment></environment>
        <key id="575742">SERVER-36259</key>
            <summary>Allow aggregations with $out to be run in a transaction when the &quot;mode&quot; does not perform DDL operations</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="kyle.suarez@mongodb.com">Kyle Suarez</reporter>
                        <labels>
                            <label>4.2-agg-txn</label>
                    </labels>
                <created>Tue, 24 Jul 2018 20:17:25 +0000</created>
                <updated>Tue, 6 Dec 2022 03:23:26 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1983729" author="kyle.suarez" created="Thu, 23 Aug 2018 13:36:16 +0000"  >&lt;p&gt;I&apos;m removing this from the $out project and placing it on the backlog for now. We&apos;ll revisit this again in 4.2 at our next planning meeting and consider transaction support for $out together with $lookup.&lt;/p&gt;</comment>
                            <comment id="1981530" author="kyle.suarez" created="Tue, 21 Aug 2018 17:57:37 +0000"  >&lt;p&gt;Yep, you&apos;re correct. It may &quot;just work&quot; out of the box, though, as there is already existing code in write_ops_exec that will &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.1.2/src/mongo/db/ops/write_ops_exec.cpp?utf8=%E2%9C%93#L192-L198&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;fail writes that attempt to implicitly create a collection&lt;/a&gt;:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
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				&lt;p style=&quot;margin: 5px 10px; padding: 0;&quot;&gt;write_ops_exec.cpp&lt;/p&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/thead&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  bgcolor=&quot;#f5f5f5&quot;  style=&quot; background-color: #f5f5f5 !important;  line-height: 1.4em !important; border-right: 1px solid #bbb; text-align: right; width: 2em; margin: 0em; vertical-align: top;&quot;&gt;
							&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot; color: #707070;  font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;192&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;void&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; makeCollection(OperationContext* opCtx, &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;const&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; NamespaceString&amp;amp; ns) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  bgcolor=&quot;#f5f5f5&quot;  style=&quot; background-color: #f5f5f5 !important;  line-height: 1.4em !important; border-right: 1px solid #bbb; text-align: right; width: 2em; margin: 0em; vertical-align: top;&quot;&gt;
							&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot; color: #707070;  font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;193&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    auto txnParticipant = TransactionParticipant::get(opCtx);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  bgcolor=&quot;#f5f5f5&quot;  style=&quot; background-color: #f5f5f5 !important;  line-height: 1.4em !important; border-right: 1px solid #bbb; text-align: right; width: 2em; margin: 0em; vertical-align: top;&quot;&gt;
							&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot; color: #707070;  font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;194&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    auto inTransaction = txnParticipant &amp;amp;&amp;amp; txnParticipant-&amp;gt;inMultiDocumentTransaction();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  bgcolor=&quot;#f5f5f5&quot;  style=&quot; background-color: #f5f5f5 !important;  line-height: 1.4em !important; border-right: 1px solid #bbb; text-align: right; width: 2em; margin: 0em; vertical-align: top;&quot;&gt;
							&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot; color: #707070;  font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;195&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    uassert(ErrorCodes::OperationNotSupportedInTransaction,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  bgcolor=&quot;#f5f5f5&quot;  style=&quot; background-color: #f5f5f5 !important;  line-height: 1.4em !important; border-right: 1px solid #bbb; text-align: right; width: 2em; margin: 0em; vertical-align: top;&quot;&gt;
							&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot; color: #707070;  font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;196&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            str::stream() &amp;lt;&amp;lt; &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;Cannot create namespace &quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; &amp;lt;&amp;lt; ns.ns()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  bgcolor=&quot;#f5f5f5&quot;  style=&quot; background-color: #f5f5f5 !important;  line-height: 1.4em !important; border-right: 1px solid #bbb; text-align: right; width: 2em; margin: 0em; vertical-align: top;&quot;&gt;
							&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot; color: #707070;  font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;197&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                          &amp;lt;&amp;lt; &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot; in multi-document transaction.&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  bgcolor=&quot;#f5f5f5&quot;  style=&quot; background-color: #f5f5f5 !important;  line-height: 1.4em !important; border-right: 1px solid #bbb; text-align: right; width: 2em; margin: 0em; vertical-align: top;&quot;&gt;
							&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot; color: #707070;  font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;198&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            !inTransaction);&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="1981527" author="nicholas.zolnierz" created="Tue, 21 Aug 2018 17:54:48 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kyle.suarez&quot; class=&quot;user-hover&quot; rel=&quot;kyle.suarez&quot;&gt;kyle.suarez&lt;/a&gt; Is implicit collection creation considered a DDL operation? If so we may want to disallow it as part of this ticket?&lt;/p&gt;</comment>
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