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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>
    </build-info>


<item>
            <title>[SERVER-46650] Allow use of string variables in log messages</title>
                <link>https://jira.mongodb.org/browse/SERVER-46650</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, it seems we aren&apos;t able to use string variables directly in a call to LOGV2. We end up with work-arounds like &lt;a href=&quot;https://github.com/mongodb/mongo/blob/45341f946b829b87ec11567dc2b897af74bc9e07/src/mongo/db/repl/replication_coordinator_impl.cpp#L3051-L3057&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;, where we build the message using &lt;tt&gt;str::stream&lt;/tt&gt; and then pass that in as an attribute.&lt;/p&gt;

&lt;p&gt;Ideally, there would be a way for us to pass in string variables directly.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1233244">SERVER-46650</key>
            <summary>Allow use of string variables in log messages</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="schwerin@mongodb.com">Andy Schwerin</assignee>
                                    <reporter username="xuerui.fa@mongodb.com">Xuerui Fa</reporter>
                        <labels>
                    </labels>
                <created>Thu, 5 Mar 2020 18:19:00 +0000</created>
                <updated>Fri, 27 Oct 2023 13:52:54 +0000</updated>
                            <resolved>Fri, 6 Mar 2020 21:35:15 +0000</resolved>
                                                                    <component>Tools</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="3014027" author="schwerin" created="Mon, 30 Mar 2020 21:54:47 +0000"  >&lt;p&gt;Non-literal message strings are explicitly not supported.&lt;/p&gt;</comment>
                            <comment id="3014007" author="william.schultz" created="Mon, 30 Mar 2020 21:45:39 +0000"  >&lt;p&gt;I feel that this issue also impacts the ease of writing log statements for printf style debugging. For example, right now, I have to write a diagnostic log message 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;LOGV2(234678, &quot;Initializing with new config&quot;,&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;      &quot;config&quot;_attr = newConfig.toBSON(),&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;      &quot;term&quot;_attr = newConfig.getConfigTerm());&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;but ideally I would like to just write:&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;LOGV2(234678, str::stream() &amp;lt;&amp;lt; &quot;Initializing with new config: &quot; &amp;lt;&amp;lt; newConfig.toBSON() &amp;lt;&amp;lt; &quot;,&quot; &amp;lt;&amp;lt; newConfig.getConfigTerm());&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;The latter, though, does not appear to be supported.&lt;/p&gt;
</comment>
                            <comment id="2949414" author="schwerin" created="Fri, 6 Mar 2020 21:26:35 +0000"  >&lt;p&gt;For the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/45341f946b829b87ec11567dc2b897af74bc9e07/src/mongo/db/repl/replication_coordinator_impl.cpp#L3051-L3057&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;example in the ticket description&lt;/a&gt;, I think the improvement in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46520&quot; title=&quot;Add way to have logger issue uasserts&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46520&quot;&gt;&lt;del&gt;SERVER-46520&lt;/del&gt;&lt;/a&gt; is more appropriate. You can use this feature to log a structured message and raise an exception at the same time.&lt;/p&gt;

&lt;p&gt;The logging system intentionally prohibits the use of variables in messages. I suppose we could investigate allowing constexpr values and not just string literals, but we want the message to be determined at compile time, and extractable to an external catalog. Variable data is intended to appear in the attribute fields.&lt;/p&gt;</comment>
                            <comment id="2949409" author="judah.schvimer" created="Fri, 6 Mar 2020 21:23:28 +0000"  >&lt;p&gt;Another example is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3d7ca6d09f0b49c3a8a142105261a7cd896da8d3/src/mongo/db/repl/replication_coordinator_impl.cpp#L3081&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;, where &apos;newlyAdded&apos; could use a string constant (and ideally would), but we inline the string instead.&lt;/p&gt;</comment>
                            <comment id="2949312" author="bruce.lucas@10gen.com" created="Fri, 6 Mar 2020 20:59:11 +0000"  >&lt;p&gt;This seems contrary to the goals of structured logging. Shouldn&apos;t the strings in the example you cited be provided as attributes, i.e. the output should be something 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;msg: &quot;Mismatch between old and new replica set configuration names&quot;&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;attr: {&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;    newName: &quot;...&quot;&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;    oldName: &quot;...&quot;&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;}&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;(Not sure of the details of the attribute names because I&apos;m not quite sure exactly what is mismatched in this case, but hopefully this conveys the idea.)&lt;/p&gt;</comment>
                            <comment id="2946248" author="judah.schvimer" created="Thu, 5 Mar 2020 18:21:53 +0000"  >&lt;p&gt;This would especially be useful for string constants that we don&apos;t want to have to duplicate.&lt;/p&gt;</comment>
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