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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-9120] Load based balancing</title>
                <link>https://jira.mongodb.org/browse/SERVER-9120</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The balancer could use a load assessment for deciding what chunk should be balanced where.&lt;/p&gt;

&lt;p&gt;Any combination of the following:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Most efficient working set&lt;/li&gt;
	&lt;li&gt;Least faults&lt;/li&gt;
	&lt;li&gt;Least writes&lt;/li&gt;
	&lt;li&gt;Least network traffic&lt;/li&gt;
	&lt;li&gt;Fastest query response time&lt;/li&gt;
	&lt;li&gt;Lowest CPU usage&lt;/li&gt;
	&lt;li&gt;Least memory used for sorting&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;&lt;b&gt;Policy 1&lt;/b&gt;:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Find most active chunk by query usage (counts + size)&lt;/li&gt;
	&lt;li&gt;Find shard with most efficient working set (least faults)&lt;/li&gt;
	&lt;li&gt;Do move&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;&lt;b&gt;Policy 2&lt;/b&gt;:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Find largest active chunk (in last X minutes)&lt;/li&gt;
	&lt;li&gt;Find shard with least number of chunks&lt;/li&gt;
	&lt;li&gt;Do move&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="69650">SERVER-9120</key>
            <summary>Load based balancing</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="10033" iconUrl="https://jira.mongodb.org/images/icons/statuses/information.png" description="Status for tickets that need to be escalated and unblocked on our team.">Blocked</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-cluster-scalability">Backlog - Cluster Scalability</assignee>
                                    <reporter username="scotthernandez">Scott Hernandez</reporter>
                        <labels>
                            <label>balancer</label>
                            <label>balancingStrategy</label>
                            <label>load</label>
                            <label>oldshardingemea</label>
                    </labels>
                <created>Mon, 25 Mar 2013 16:13:32 +0000</created>
                <updated>Tue, 16 Jan 2024 14:17:47 +0000</updated>
                                                                            <component>Performance</component>
                    <component>Sharding</component>
                                        <votes>3</votes>
                                    <watches>6</watches>
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                                        <issuelink>
            <issuekey id="31307">SERVER-5047</issuekey>
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            <issuekey id="69626">SERVER-9114</issuekey>
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