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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-7225] Consider replacing/refactoring log() streams.</title>
                <link>https://jira.mongodb.org/browse/SERVER-7225</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, all log messages are implemented using streams and manipulators.  This is problematic when a function is passed to a log() stream (because the function will be called regardless of the log level or use of NullStreams).&lt;/p&gt;

&lt;p&gt;Take, for example, this seemingly innocuous line:&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;            log( pc ) &amp;lt;&amp;lt; &quot;finishing on shard &quot; &amp;lt;&amp;lt; shard &amp;lt;&amp;lt; &quot;, current connection state is &quot; &amp;lt;&amp;lt; mdata &amp;lt;&amp;lt; endl;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Because mdata is of type ParallelConnectionMetadata, and defines a toString() method which calls toBSON(), we waste CPU time (and malloc/free much more than necessary) even if verbose logging is disabled.&lt;/p&gt;

&lt;p&gt;To gauge impact, the supplied patch was applied.  A simple stress test which floods mongos with simple find() operations performed 6500 queries per second unpatched, and 7600 queries per second with the patch.&lt;/p&gt;</description>
                <environment>All</environment>
        <key id="52015">SERVER-7225</key>
            <summary>Consider replacing/refactoring log() streams.</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="benjamin.becker">Ben Becker</reporter>
                        <labels>
                            <label>logging</label>
                    </labels>
                <created>Tue, 2 Oct 2012 07:10:30 +0000</created>
                <updated>Tue, 2 Oct 2012 16:54:34 +0000</updated>
                            <resolved>Tue, 2 Oct 2012 16:54:34 +0000</resolved>
                                    <version>2.0.7</version>
                    <version>2.2.0</version>
                                                    <component>Logging</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="170441" author="benjamin.becker" created="Tue, 2 Oct 2012 16:54:34 +0000"  >&lt;p&gt;The LOG() macro already exists to solve this problem by jumping over the stream evaluation entirely if the global log level is less than the supplied argument.&lt;/p&gt;

&lt;p&gt;Updated documentation to reflect this behavior: &lt;a href=&quot;https://wiki.10gen.com/display/DOCS/Kernel+logging&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://wiki.10gen.com/display/DOCS/Kernel+logging&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="20410" name="remove_logs_from_fastpath.diff" size="4893" author="benjamin.becker" created="Tue, 2 Oct 2012 07:10:30 +0000"/>
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