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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-7331] Optimize mongos performance</title>
                <link>https://jira.mongodb.org/browse/SERVER-7331</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Several performance issues have been identified in mongos.  &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7231&quot; title=&quot;Replace log(int level) statements with LOG(int level)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7231&quot;&gt;&lt;del&gt;SERVER-7231&lt;/del&gt;&lt;/a&gt; addresses one issue with logging in ParallelSortClusterCursor.  There is much more room for optimization, though.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Baseline&quot;&gt;&lt;/a&gt;Baseline&lt;/h4&gt;
&lt;p&gt;In a simple test which floods mongos with a valid findOne() query, mongos was initially handling 20k queries per second.   If the clients connected directly to the shard with the data, the shard would handle 50-60k queries per second.  See mongos1_withlog.ps.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;NoLogging&quot;&gt;&lt;/a&gt;No Logging&lt;/h4&gt;
&lt;p&gt;The first set (&apos;nolog&apos;) is based on v2.2, but with the log() statements in parallel.cpp commented out.  This increased mongos&apos; concurrent query volume to 30k queries per second.  See mongos1_nolog.ps, and mongod1_nolog.ps.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;ShortcircuitgetShardsForQuery%28%29&quot;&gt;&lt;/a&gt;Short-circuit getShardsForQuery()&lt;/h4&gt;
&lt;p&gt;The second set (&apos;nogetShardsForQuery&apos;) includes the &apos;nolog&apos; patch, and also immediately returns the first shard:&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;
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				&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;     void ChunkManager::getShardsForQuery( set&amp;lt;Shard&amp;gt;&amp;amp; shards , const BSONObj&amp;amp; query ) const {&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;+        shards.insert(_chunkRanges.ranges().begin()-&amp;gt;second-&amp;gt;getShard());&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;+        return;&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;When testing with a query that targets this shard, mongos handles 40-45k queries per second.  See mongos1_nogetShardsForQuery.ps, and mongod3_nogetShardsForQuery.ps.&lt;/p&gt;</description>
                <environment>All&lt;br/&gt;
Test Bed: Physical machine with CentOS 6.3, Linux kernel 2.6.32-279.9.1.el6&lt;br/&gt;
8 gigs of memory&lt;br/&gt;
8 cores&lt;br/&gt;
Client tests were run locally to avoid profiling network latency (as direct connections were not available for these machines).</environment>
        <key id="52943">SERVER-7331</key>
            <summary>Optimize mongos performance</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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>
                    </labels>
                <created>Thu, 11 Oct 2012 20:04:58 +0000</created>
                <updated>Fri, 7 Mar 2014 17:11:32 +0000</updated>
                            <resolved>Fri, 7 Mar 2014 17:11:04 +0000</resolved>
                                    <version>2.2.0</version>
                                                    <component>Sharding</component>
                                        <votes>7</votes>
                                    <watches>14</watches>
                                                                                                                    <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="52066">SERVER-7231</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is depended on by">
                                                        </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                            <outwardlinks description="duplicates">
                                        <issuelink>
            <issuekey id="15130">SERVER-2768</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="53674">SERVER-7422</issuekey>
        </issuelink>
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                                                                <inwardlinks description="is related to">
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                            <attachment id="20619" name="mongod1_nolog.ps" size="109465" author="benjamin.becker" created="Thu, 11 Oct 2012 20:04:58 +0000"/>
                            <attachment id="20620" name="mongod3_nogetShardsForQuery.ps" size="108586" author="benjamin.becker" created="Thu, 11 Oct 2012 20:04:58 +0000"/>
                            <attachment id="20621" name="mongos1_nogetShardsForQuery.ps" size="116921" author="benjamin.becker" created="Thu, 11 Oct 2012 20:04:58 +0000"/>
                            <attachment id="20622" name="mongos1_nolog.ps" size="115175" author="benjamin.becker" created="Thu, 11 Oct 2012 20:04:58 +0000"/>
                            <attachment id="20623" name="mongos1_withlog.ps" size="114560" author="benjamin.becker" created="Thu, 11 Oct 2012 20:04:58 +0000"/>
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