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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-20596] Performance regression in new mongos query path (about 17% worse than 3.0)</title>
                <link>https://jira.mongodb.org/browse/SERVER-20596</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;During the 3.1 development cycle, the implementation of find and getMore on mongos was rewritten under SERVER-15176. This new mongos query path plugs into the TaskExecutor event loop framework. It issues find, getMore, and killCursors commands to the shards using the new asynchronous networking layer. Our automated industry benchmarks performance loop shows that the new query path is about 17% slower than its 3.0 predecessor. This ticket tracks the work to achieve parity with 3.0 on the industry benchmark workload, which could involve optimizations to the asynchronous networking code, the task executor layer, or the new query path itself.&lt;/p&gt;

&lt;h2&gt;&lt;a name=&quot;OriginalDescription&quot;&gt;&lt;/a&gt;Original Description&lt;/h2&gt;

&lt;p&gt;Read performance regression found in system-perf EVG test. This is due to following change:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b1982bb7fb610def9b23ab08b0317e6f409c1784&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b1982bb7fb610def9b23ab08b0317e6f409c1784&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;this enable new mongos query path for legacy read, therefore, here we are showing the performance issue with new path.&lt;/p&gt;

&lt;p&gt;A single findOne test with a single sharded cluster with benchRun&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;resultsforb1982b%3A&quot;&gt;&lt;/a&gt;results for b1982b:&lt;/h3&gt;
&lt;p/&gt;
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					&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;findOne&quot;                      |       32 | 13236.845747 | true     | &quot;&quot;                           |&lt;/span&gt;&lt;/pre&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;h3&gt;&lt;a name=&quot;32e55%2CtheparentSHA&quot;&gt;&lt;/a&gt;32e55, the parent SHA&lt;/h3&gt;
&lt;p/&gt;
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						&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;findOne&quot;                      |       32 | 35064.731049 | true     | &quot;&quot;                           |&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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					&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;findOne&quot;                      |       64 | 35064.437971 | true     | &quot;&quot;                           |&lt;/span&gt;&lt;/pre&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="231248">SERVER-20596</key>
            <summary>Performance regression in new mongos query path (about 17% worse than 3.0)</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="4">Incomplete</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="rui.zhang">Rui Zhang</reporter>
                        <labels>
                            <label>sys-perf-reg</label>
                    </labels>
                <created>Thu, 24 Sep 2015 00:03:54 +0000</created>
                <updated>Tue, 6 Dec 2022 04:43:45 +0000</updated>
                            <resolved>Thu, 24 Oct 2019 19:22:01 +0000</resolved>
                                    <version>3.1.9</version>
                                                    <component>Performance</component>
                    <component>Querying</component>
                    <component>Sharding</component>
                                        <votes>2</votes>
                                    <watches>27</watches>
                                                                                                                <comments>
                            <comment id="2499771" author="sheeri.cabral" created="Thu, 24 Oct 2019 19:22:01 +0000"  >&lt;p&gt;Closing, tests showed it wasn&apos;t query path related, and the purported regression is from a years-old version.&lt;/p&gt;</comment>
                            <comment id="1095807" author="david.storch" created="Mon, 23 Nov 2015 15:38:48 +0000"  >&lt;p&gt;We&apos;ve made substantial performance improvements under the various linked tickets. However, we have not yet achieved parity with version 3.0 on the industry benchmarks workload. I have updated the title and description of this ticket to reflect our progress. Bumping this ticket into 3.3 Required, since the current perf is sufficient for the 3.2.0 release.&lt;/p&gt;</comment>
                            <comment id="1083774" author="xgen-internal-githook" created="Mon, 9 Nov 2015 21:48:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;andy10gen&apos;, u&apos;name&apos;: u&apos;Andy Schwerin&apos;, u&apos;email&apos;: u&apos;schwerin@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20596&quot; title=&quot;Performance regression in new mongos query path (about 17% worse than 3.0)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20596&quot;&gt;&lt;del&gt;SERVER-20596&lt;/del&gt;&lt;/a&gt; Remove unhelpful timer that shows up in mongos profiles.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7fc05bad65a96cba3a08eb79d1a7060199985e11&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7fc05bad65a96cba3a08eb79d1a7060199985e11&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1080626" author="xgen-internal-githook" created="Thu, 5 Nov 2015 16:24:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20596&quot; title=&quot;Performance regression in new mongos query path (about 17% worse than 3.0)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20596&quot;&gt;&lt;del&gt;SERVER-20596&lt;/del&gt;&lt;/a&gt; don&apos;t access ClusterCursorManager for single-batch queries&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5edafdbf6ca1effcb18d62c8e53b37544afecfcc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5edafdbf6ca1effcb18d62c8e53b37544afecfcc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1067903" author="xgen-internal-githook" created="Thu, 22 Oct 2015 14:57:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20596&quot; title=&quot;Performance regression in new mongos query path (about 17% worse than 3.0)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20596&quot;&gt;&lt;del&gt;SERVER-20596&lt;/del&gt;&lt;/a&gt; do less work inside the ClusterCursorManager lock&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4a53cc3e6acb4d4486a6f126151ed5eb2d189a86&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4a53cc3e6acb4d4486a6f126151ed5eb2d189a86&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="239129">SERVER-21436</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="232879">SERVER-20763</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="227634">SERVER-20194</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="239182">SERVER-21441</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="233803">SERVER-20853</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="234553">SERVER-20944</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                    </issuelinks>
                <attachments>
                            <attachment id="91153" name="BD-1193-a.png" size="69182" author="rui.zhang" created="Thu, 24 Sep 2015 00:03:54 +0000"/>
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