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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-46674] Comparing RWC by converting to BSON is not robust to concurrent FCV changes</title>
                <link>https://jira.mongodb.org/browse/SERVER-46674</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The serialisation of read/write concern may or may not include the &lt;tt&gt;provenance&lt;/tt&gt; field, depending on the FCV.  This means that if FCV is upgraded concurrently, such that one side of the BSON comparison includes &lt;tt&gt;provenance&lt;/tt&gt; but the other doesn&apos;t, then the comparison result will be spurious.&lt;/p&gt;

&lt;p&gt;The only place this occurs is when making sure that commands don&apos;t alter the writeConcern during their runtime:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.5.0/src/mongo/db/service_entry_point_common.cpp#L788&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r4.5.0/src/mongo/db/service_entry_point_common.cpp#L788&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;
&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;        &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// With the exception of getMores inheriting the WriteConcern from the originating command,&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;        &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// nothing in run() should change the writeConcern.&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;        dassert(command-&amp;gt;getLogicalOp() == LogicalOp::opGetMore&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;                    ? !extractedWriteConcern&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;                    : (extractedWriteConcern &amp;amp;&amp;amp;&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;                       SimpleBSONObjComparator::kInstance.evaluate(&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;                           opCtx-&amp;gt;getWriteConcern().toBSON() == extractedWriteConcern-&amp;gt;toBSON())));&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;Possible solutions (in my suggested order of preference):&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;Stop doing this comparison via BSON, and instead add a way to properly compare the internal fields of the WriteConcernOptions.&lt;/li&gt;
	&lt;li&gt;Add a &lt;tt&gt;bool forceProvenance = false&lt;/tt&gt; parameter to &lt;tt&gt;WriteConcernOptions::toBSON()&lt;/tt&gt;, which is passed as true in these invocations.&lt;/li&gt;
	&lt;li&gt;After generating the BSONObjs for comparison, strip out any &lt;tt&gt;provenance&lt;/tt&gt; field from both objects before comparing them.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;We should also improve the assertion so that it includes the conflicting writeConcerns in the message when it fails (in the non-opGetMore case).&lt;/p&gt;</description>
                <environment></environment>
        <key id="1238741">SERVER-46674</key>
            <summary>Comparing RWC by converting to BSON is not robust to concurrent FCV changes</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="kevin.pulo@mongodb.com">Kevin Pulo</assignee>
                                    <reporter username="kevin.pulo@mongodb.com">Kevin Pulo</reporter>
                        <labels>
                    </labels>
                <created>Fri, 6 Mar 2020 12:24:10 +0000</created>
                <updated>Sun, 29 Oct 2023 22:11:10 +0000</updated>
                            <resolved>Thu, 12 Mar 2020 02:20:00 +0000</resolved>
                                                    <fixVersion>4.4.0-rc0</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                    <component>Replication</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2995596" author="xgen-internal-githook" created="Wed, 25 Mar 2020 04:58:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kevin.pulo@mongodb.com&apos;, &apos;name&apos;: &apos;Kevin Pulo&apos;, &apos;username&apos;: &apos;devkev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46674&quot; title=&quot;Comparing RWC by converting to BSON is not robust to concurrent FCV changes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46674&quot;&gt;&lt;del&gt;SERVER-46674&lt;/del&gt;&lt;/a&gt; Compare WriteConcernOptions properly (without converting to BSON)&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 339fe2c4fda1d54912f6d175caee4d8c3c801b71)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cd4d915d3eebd793620e88eb7a4b102aae756274&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cd4d915d3eebd793620e88eb7a4b102aae756274&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2969568" author="xgen-internal-githook" created="Thu, 12 Mar 2020 01:29:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;devkev&apos;, &apos;name&apos;: &apos;Kevin Pulo&apos;, &apos;email&apos;: &apos;kevin.pulo@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46674&quot; title=&quot;Comparing RWC by converting to BSON is not robust to concurrent FCV changes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46674&quot;&gt;&lt;del&gt;SERVER-46674&lt;/del&gt;&lt;/a&gt; Compare WriteConcernOptions properly (without converting to BSON)&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/339fe2c4fda1d54912f6d175caee4d8c3c801b71&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/339fe2c4fda1d54912f6d175caee4d8c3c801b71&lt;/a&gt;&lt;/p&gt;</comment>
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