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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-34881] Don&apos;t wait for writeConcern when committing a read-only transaction with readConcern: &apos;local&apos;</title>
                <link>https://jira.mongodb.org/browse/SERVER-34881</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34880&quot; title=&quot;Make readConcern:local wait for write concern on a read-only transaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34880&quot;&gt;&lt;del&gt;SERVER-34880&lt;/del&gt;&lt;/a&gt; undid this behavior, pending the fix for&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34837&quot; title=&quot;Make the default readConcern level for transactions be speculative majority&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34837&quot;&gt;SERVER-34837&lt;/a&gt;.&#160; Once&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34837&quot; title=&quot;Make the default readConcern level for transactions be speculative majority&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34837&quot;&gt;SERVER-34837&lt;/a&gt; is fixed, we should revert the changes from&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34880&quot; title=&quot;Make readConcern:local wait for write concern on a read-only transaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34880&quot;&gt;&lt;del&gt;SERVER-34880&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="540571">SERVER-34881</key>
            <summary>Don&apos;t wait for writeConcern when committing a read-only transaction with readConcern: &apos;local&apos;</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-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                            <label>open_todo_in_code</label>
                    </labels>
                <created>Mon, 7 May 2018 22:36:30 +0000</created>
                <updated>Tue, 6 Dec 2022 03:30:12 +0000</updated>
                                                                            <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="2976343" author="schwerin" created="Thu, 12 Mar 2020 19:00:52 +0000"  >&lt;p&gt;I agree with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=geert.bosch&quot; class=&quot;user-hover&quot; rel=&quot;geert.bosch&quot;&gt;geert.bosch&lt;/a&gt; and&#160;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tess.avitabile&quot; class=&quot;user-hover&quot; rel=&quot;tess.avitabile&quot;&gt;tess.avitabile&lt;/a&gt;. Does that make this ticket &quot;Works as Designed&quot;? I&apos;m a little turned around.&lt;/p&gt;</comment>
                            <comment id="2917778" author="tess.avitabile" created="Fri, 28 Feb 2020 18:23:32 +0000"  >&lt;p&gt;Geert&apos;s argument is no. There should be no difference between a transaction that looks like:&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;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&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;   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;findAndModify(...)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;and one that looks like:&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;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&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: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;let x = find(...)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&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;if (x == 0)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&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;    update(...)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;I agree with him. These should do the same thing.&lt;/p&gt;</comment>
                            <comment id="2917658" author="judah.schvimer" created="Fri, 28 Feb 2020 17:43:45 +0000"  >&lt;p&gt;We can distinguish a transaction that does not attempt to do a write and one that attempts to do a write but does a noop write. Should those be different in this case? Should the truly read-only transaction no wait for write concern if read concern is local, but a transaction with a noop write would wait for write concern no matter the read concern?&lt;/p&gt;</comment>
                            <comment id="2917611" author="tess.avitabile" created="Fri, 28 Feb 2020 17:27:15 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=geert.bosch&quot; class=&quot;user-hover&quot; rel=&quot;geert.bosch&quot;&gt;geert.bosch&lt;/a&gt; and I just discussed this ticket, and now I&apos;m considering whether this should be closed as Works As Designed. His argument is that regardless of the readConcern, a noop write should wait for writeConcern. In a transaction, that noop write can take the form of a findAndModify or a find command that led to a decision not to write.&lt;/p&gt;

&lt;p&gt;I&apos;m not sure what the correct answer is. Certainly, it&apos;s important that the default behavior is that a noop write waits for writeConcern, which is why we made the default behavior of readConcern in transactions to be speculative majority (for now this is done by making local and majority behave the same, in the future we would make this explicit in&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34837&quot; title=&quot;Make the default readConcern level for transactions be speculative majority&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34837&quot;&gt;SERVER-34837&lt;/a&gt;). Another consideration is that if we stop waiting for writeConcern for read-only transactions with readConcern local, we would want to ensure the behavior is consistent between find and findAndModify. So the question is whether we want to provide a readConcern offering that does not wait for writeConcern at commit time if no writes were performed. Maybe the anomaly with noop writes means we don&apos;t want to provide this consistency offering at all.&lt;/p&gt;

&lt;p&gt;CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=schwerin&quot; class=&quot;user-hover&quot; rel=&quot;schwerin&quot;&gt;schwerin&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2305327" author="ratika.gandhi" created="Fri, 28 Jun 2019 20:01:52 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=samy.lanka&quot; class=&quot;user-hover&quot; rel=&quot;samy.lanka&quot;&gt;samy.lanka&lt;/a&gt;, moving this ticket out of the Address Tech Debt transactions epic. It will require scoping, competitive analysis and prioritization.&#160;&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="538860">SERVER-34837</issuekey>
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="514561">SERVER-34038</issuekey>
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            <issuekey id="540570">SERVER-34880</issuekey>
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