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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-64196] Implement BalancerStatisticsRegistry and command to retrieve its state</title>
                <link>https://jira.mongodb.org/browse/SERVER-64196</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Implement a&#160;&lt;tt&gt;BalancerStatsRegistry&lt;/tt&gt; component living on the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c384cf7c7531be8a92b6f70e9d5d888ba80096c6/src/mongo/s/grid.h#L53&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Grid&lt;/a&gt; on shards and initialized as part of &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c384cf7c7531be8a92b6f70e9d5d888ba80096c6/src/mongo/db/s/sharding_initialization_mongod.cpp#L488&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;initializeGlobalShardingStateMongoD&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;The high level idea is for this registry to provide some method to retrieve the following stats for sharded collections:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/collStats/#mongodb-data-collStats.count&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Count of documents&lt;/a&gt; (storage stat).&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/collStats/#mongodb-data-collStats.avgObjSize&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Average document size&lt;/a&gt; (storage stat).&lt;/li&gt;
	&lt;li&gt;Count of orphaned documents.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The registry will just serve as a proxy for storage stats (&lt;a href=&quot;https://github.com/mongodb/mongo/blob/c384cf7c7531be8a92b6f70e9d5d888ba80096c6/src/mongo/db/catalog/collection_impl.h#L369&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;numRecords&lt;/a&gt; and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c384cf7c7531be8a92b6f70e9d5d888ba80096c6/src/mongo/db/catalog/collection_impl.h#L383&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;averageObjSize&lt;/a&gt;) and they&apos;re not going to be recalculated or tracked in memory. The only information that it will need to track in memory is the mapping &lt;tt&gt;namespace -&amp;gt; number of orphans&lt;/tt&gt; (for the purpose of this ticket, orphan counters can simply be initialized to &lt;tt&gt;0&lt;/tt&gt;).&lt;/p&gt;

&lt;p&gt;The registry will serve as mean to retrieve collection sizes calculated as follows for a given namespace:&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;collSize = average docs size * (number of docs - number of orphaned docs)&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;Purpose of this ticket is to implement the &lt;tt&gt;BalancerStatsRegistry&lt;/tt&gt; and provide a &lt;tt&gt;_shardsvrRetrieveStatsForBalancing&lt;/tt&gt; command to retrieve its state in order to lie the ground for testing before implementing further functionalities.&lt;/p&gt;

&lt;p&gt;The &lt;tt&gt;_shardsvrRetrieveStatsForBalancing&lt;/tt&gt; command accepts as arguments an optional &lt;tt&gt;namespace&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;If no namespace is specified, the command returns the &lt;tt&gt;collSizeMB&lt;/tt&gt; for every sharded collection, for example:&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;[{ns: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;db.coll&apos;&lt;/span&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;, collSizeMB: 50MB}, {ns: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;db.abc&quot;&lt;/span&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;, collSizeMB: 24567MB}]&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;If a namespace is specified, it only returns stat for the requested namespace.&lt;/p&gt;

&lt;p&gt;(The output example above is just to give an idea, it&apos;s possible to implement a better format, e.g. simply &quot;ns&quot; keys and &quot;collSizeMB&quot; values).&lt;/p&gt;</description>
                <environment></environment>
        <key id="1994512">SERVER-64196</key>
            <summary>Implement BalancerStatisticsRegistry and command to retrieve its state</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="13201">Fixed</resolution>
                                        <assignee username="tommaso.tocci@mongodb.com">Tommaso Tocci</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                    </labels>
                <created>Fri, 4 Mar 2022 08:15:04 +0000</created>
                <updated>Sun, 29 Oct 2023 21:41:38 +0000</updated>
                            <resolved>Tue, 5 Apr 2022 20:58:54 +0000</resolved>
                                                    <fixVersion>6.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4457285" author="xgen-internal-githook" created="Tue, 5 Apr 2022 11:03:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64196&quot; title=&quot;Implement BalancerStatisticsRegistry and command to retrieve its state&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64196&quot;&gt;&lt;del&gt;SERVER-64196&lt;/del&gt;&lt;/a&gt; Implement BalancerStatisticsRegistry and command to retrieve its state&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/865b891e92e201dc4a3e65e37524b13cfccb38a4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/865b891e92e201dc4a3e65e37524b13cfccb38a4&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="1993923">SERVER-64162</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1994519">SERVER-64198</issuekey>
        </issuelink>
                            </inwardlinks>
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                            <issuelinktype id="10520">
                    <name>Problem/Incident</name>
                                            <outwardlinks description="causes">
                                        <issuelink>
            <issuekey id="2019281">SERVER-65326</issuekey>
        </issuelink>
                            </outwardlinks>
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