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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-5491] Configurable balancer delay parameter</title>
                <link>https://jira.mongodb.org/browse/SERVER-5491</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;delayMs in config.settings(&lt;/p&gt;
{ _id : balancer }
&lt;p&gt;)?&lt;/p&gt;</description>
                <environment></environment>
        <key id="35398">SERVER-5491</key>
            <summary>Configurable balancer delay parameter</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="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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-sharding-emea">[DO NOT USE] Backlog - Sharding EMEA</assignee>
                                    <reporter username="greg_10gen">Greg Studer</reporter>
                        <labels>
                            <label>lamont-triage</label>
                    </labels>
                <created>Tue, 3 Apr 2012 18:35:14 +0000</created>
                <updated>Tue, 6 Dec 2022 05:34:13 +0000</updated>
                            <resolved>Fri, 17 Dec 2021 14:53:04 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="571041" author="alex.komyagin@10gen.com" created="Fri, 2 May 2014 19:16:28 +0000"  >&lt;p&gt;Another setup where this functionality would have helped.&lt;/p&gt;

&lt;p&gt;The FROM shard has 4 nodes: one primary and 3 secondaries. 2 secondaries are somewhat slower that another one. With secondaryThrottle enabled the deletes are throttled by the fastest secondary, eventually causing 2 slower secondaries to be overloaded by the rate of deletes that they can&apos;t sustain.&lt;/p&gt;</comment>
                            <comment id="290359" author="justanyone" created="Fri, 15 Mar 2013 18:38:32 +0000"  >&lt;p&gt;From a user perspective: when we have a constant very high load, we can get unbalanced and become more so.  Once a shard has more chunks, it gets more activity, which generates more chunks, etc. (it&apos;s dynamically unstable).   &lt;/p&gt;

&lt;p&gt;I can suggest a radioactive-decay model where the longer it goes unbalanced the higher the priority placed on balancing vs. writes.  Aggressiveness could then be derived/tuned using heuristics from your MMS service&apos;s data.&lt;/p&gt;</comment>
                            <comment id="106602" author="eliot" created="Wed, 4 Apr 2012 18:09:22 +0000"  >&lt;p&gt;i like the idea of a balancer aggressive metric&lt;br/&gt;
0 to 10&lt;br/&gt;
no units&lt;/p&gt;

&lt;p&gt;that way we can tune parameters based on it, but the parameters could change over time, etc...&lt;/p&gt;</comment>
                            <comment id="106555" author="greg_10gen" created="Wed, 4 Apr 2012 16:48:04 +0000"  >&lt;p&gt;Agree that making things smarter would be helpful, but still think a general &quot;balancer aggressiveness&quot; parameter is needed, because we have all kinds of customer apps that can tolerate more-or-less interruption.  Any set of benchmarks we choose is going to have issues (for the same reason that we don&apos;t publish benchmarks of our own, there are too many system-specific issues).&lt;/p&gt;</comment>
                            <comment id="106326" author="eliot" created="Wed, 4 Apr 2012 00:41:54 +0000"  >&lt;p&gt;I&apos;m pretty opposed to a delay parameter.&lt;/p&gt;

&lt;p&gt;We should figure out why this is needed and then address that.&lt;/p&gt;

&lt;p&gt;i.e. wait until queues sizes go back to normal, or replication catches up.&lt;/p&gt;</comment>
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            <issuekey id="35397">SERVER-5490</issuekey>
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