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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-4961] $group is taking 2x as long as collection.group()</title>
                <link>https://jira.mongodb.org/browse/SERVER-4961</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This came from a DISQUS comment on the &quot;Aggregation Framework&quot; page:&lt;br/&gt;
I&apos;m testing MongoDB 2.1.0 in order to evaluate the performance of the new aggregation framework. I&apos;m wondering why it&apos;s 2x slower in my use case.&lt;/p&gt;

&lt;p&gt;Here is the code I used before version 2.1.0 (using Python and pymongo):&lt;/p&gt;

&lt;p&gt;        db.customers.group(            &lt;/p&gt;
{&apos;segment&apos;: True}
&lt;p&gt;,            None,            &lt;/p&gt;
{&apos;count&apos;: 0}
&lt;p&gt;,            &quot;function (obj, prev) &lt;/p&gt;
{ prev.count ++; }
&lt;p&gt;&quot;        )&lt;/p&gt;

&lt;p&gt;Here is the same computation using the new aggregation framework:&lt;/p&gt;

&lt;p&gt;        db.command(&apos;aggregate&apos;, &apos;customers&apos;, pipeline=[            {&apos;$group&apos; : {                &apos;_id&apos;: &apos;$segment&apos;,                &apos;count&apos;: &lt;/p&gt;
{&apos;$sum&apos;: 1}
&lt;p&gt;            }}        ])&lt;/p&gt;

&lt;p&gt;On my computer with my dataset, the first version runs in ~1 s, the second version in ~2.5 s. Is it expected or am I doing something wrong?&lt;/p&gt;</description>
                <environment></environment>
        <key id="30534">SERVER-4961</key>
            <summary>$group is taking 2x as long as collection.group()</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="9">Done</resolution>
                                        <assignee username="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="dan@mongodb.com">Daniel Pasette</reporter>
                        <labels>
                    </labels>
                <created>Mon, 13 Feb 2012 20:33:16 +0000</created>
                <updated>Mon, 11 Jul 2016 18:34:45 +0000</updated>
                            <resolved>Mon, 27 Aug 2012 22:44:43 +0000</resolved>
                                    <version>2.1.0</version>
                                    <fixVersion>2.2.0-rc2</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>2</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="157257" author="redbeard0531" created="Mon, 27 Aug 2012 22:44:43 +0000"  >&lt;p&gt;There were several optimizations to aggregation before 2.2.0. I just did a test on my machine with 5 million docs, each with a random segment from 0 to 999 and it took 4 seconds with aggregate and 24 seconds with the js-based group. Please file a new ticket if you can find a case of performance regression using the 2.2 rc or final release.&lt;/p&gt;</comment>
                            <comment id="105784" author="samuelgmartinez" created="Mon, 2 Apr 2012 18:26:33 +0000"  >&lt;p&gt;@Chris Westin, sorry, you are totally right. My comments are offtopic, but i tried to make a point about grouping optimization.&lt;/p&gt;

&lt;p&gt;Thanks for creating the related issue &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</comment>
                            <comment id="105762" author="cwestin" created="Mon, 2 Apr 2012 17:49:04 +0000"  >&lt;p&gt;@Samuel Garcia Martinez:  that&apos;s a different optimization than the one this ticket is about.  For your suggestion, I&apos;ve opened &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5477&quot; title=&quot;when sharded, no need to merge groups if $group _id is the shard key or original document _id&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5477&quot;&gt;SERVER-5477&lt;/a&gt; .  This ticket is about being able to scan an index if it contains a prefix of the $group _id; that could be any index, not necessarily related to the shard key.&lt;/p&gt;</comment>
                            <comment id="105607" author="samuelgmartinez" created="Mon, 2 Apr 2012 09:55:46 +0000"  >&lt;p&gt;Adding more info to my previous comment:&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;mongos&amp;gt; function testGroup() {&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;... var date = new Date();&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;... db.mycollection.aggregate({$match: { date: { $gte: ISODate(&apos;2010-09-01T00:00:00Z&apos;), $lt: ISODate(&apos;2010-10-01T00:00:00Z&apos;)}}}, {$group: {_id:{query_hash:1},totalCount:{$sum:&quot;$queryCount&quot;}} },{$skip:1000},{$limit:10});&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;... print(&apos;Time &apos; + (new Date() - date));&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;/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;mongos&amp;gt; testGroup();&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;Time 2399&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;Adding log info from shards: &lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;shard1:
&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;{{Mon Apr  2 11:48:03 [conn3] command mydb.$cmd command: { aggregate: &quot;mycollection&quot;, pipeline: [ { $match: { date: { $gte: new Date(1283299200000), $lt: new Date(1285891200000) } } }, { $group: { _id: { query_hash: true }, totalCount: { $sum: &quot;$queryCount&quot; } } } ], fromRouter: true } ntoreturn:1 keyUpdates:0 reslen:3150640 1107ms&#160;}}&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;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;shard2:
&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;Mon Apr  2 11:48:45 [conn63] command mydb.$cmd command: { aggregate: &quot;mycollection&quot;, pipeline: [ { $match: { date: { $gte: new Date(1283299200000), $lt: new Date(1285891200000) } } }, { $group: { _id: { query_hash: true }, totalCount: { $sum: &quot;$queryCount&quot; } } } ], fromRouter: true } ntoreturn:1 keyUpdates:0 reslen:3478690 1506ms&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;/li&gt;
&lt;/ul&gt;


&lt;p&gt;I think is important to remark that slower shard takes ~1.5s to answer, however mongos takes an additional second to build the result without a merge sort operation. &lt;/p&gt;</comment>
                            <comment id="105592" author="samuelgmartinez" created="Mon, 2 Apr 2012 08:38:28 +0000"  >&lt;p&gt;On sharded environment and using early grouping, besides the use of an index, it would be nice that we be able to avoid the mongos regrouping process. &lt;/p&gt;

&lt;p&gt;I&apos;ll try to explain that: &lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;result_node1: [&lt;br/&gt;
      
{ id: &quot;value1&quot;, totalcount: 50 }
&lt;p&gt;,&lt;/p&gt;
      { id: &quot;value2&quot;, totalcount: 100 }
&lt;p&gt;    ]&lt;/p&gt;&lt;/li&gt;
	&lt;li&gt;result_node2: [ 
{ id: &quot;value1&quot;, totalcount: 60 }
&lt;p&gt; ]&lt;/p&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The real results(after mongos regroup) must looks like: &lt;br/&gt;
 [&lt;br/&gt;
    &lt;/p&gt;
{ id: &quot;value1&quot;, totalcount: 110 }
&lt;p&gt;,&lt;/p&gt;
    { id: &quot;value2&quot;, totalcount: 100 }
&lt;p&gt; ]&lt;/p&gt;

&lt;p&gt;But, in some cases, mongos regrouping process is nonsense since the grouping key is same as sharding key. So, never got same group key from different shards.&lt;/p&gt;

&lt;p&gt;So, the prior example, now looks like: &lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;result_node1: [
{ id: &quot;value1&quot;, totalcount: 110 }
&lt;p&gt;]&lt;/p&gt;&lt;/li&gt;
	&lt;li&gt;result_node2: [
{ id: &quot;value2&quot;, totalcount: 100 }
&lt;p&gt;]&lt;/p&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The real results must looks like: &lt;br/&gt;
 [&lt;br/&gt;
      &lt;/p&gt;
{ id: &quot;value1&quot;, totalcount: 110 }
&lt;p&gt;,&lt;/p&gt;
      { id: &quot;value2&quot;, totalcount: 100 }
&lt;p&gt; ]&lt;/p&gt;

&lt;p&gt;So, the point is mongos regrouping process is a waste of time when you group using same key as sharding key.&lt;/p&gt;</comment>
                            <comment id="88004" author="cwestin" created="Mon, 13 Feb 2012 20:36:28 +0000"  >&lt;p&gt;To the original poster:  is there an index on &quot;segment&quot;?&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="38245">SERVER-5795</issuekey>
        </issuelink>
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                            <issuelinktype id="10010">
                    <name>Duplicate</name>
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            <issuekey id="33561">SERVER-5361</issuekey>
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            <issuekey id="10927">SERVER-447</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="26715">SERVER-4507</issuekey>
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