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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-73126] Integrate auto-merging within the balancer</title>
                <link>https://jira.mongodb.org/browse/SERVER-73126</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Make the balancer rely on the command path introduced by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-72278&quot; title=&quot;Implement `mergeAllChunksOnShard` command paths&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-72278&quot;&gt;&lt;del&gt;SERVER-72278&lt;/del&gt;&lt;/a&gt; in order to issue &lt;tt&gt;mergeAllChunksOnShard&lt;/tt&gt; on shards.&lt;/p&gt;

&lt;p&gt;The execution of the auto-merging path must be conditional on the value of the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/65b5512fb09ac732826b66c3c6de0ed878751872/src/mongo/s/sharding_feature_flags.idl#L96-L99&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;auto merger feature flag&lt;/a&gt;.&lt;br/&gt;
Auto-merging must happen:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;When the balancer gets enabled&lt;/li&gt;
	&lt;li&gt;Every X hours after the last execution, configurable via a new server parameter defaulted to 24 hours. There is no need to track on disk the last time auto-merging happened, we could simply track an in-memory state cleared up when the balancer gets disabled.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The balancer should simply catch and ignore &lt;tt&gt;CommandNotFound&lt;/tt&gt; errors that may be thrown in case of this super-improbable flow:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Balancer checks FCV and feature flag, check passes&lt;/li&gt;
	&lt;li&gt;FCV changes&lt;/li&gt;
	&lt;li&gt;Shard binaries are replaced&lt;/li&gt;
	&lt;li&gt;Balancer issues &lt;tt&gt;mergeAllChunksOnShard&lt;/tt&gt;&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="2238400">SERVER-73126</key>
            <summary>Integrate auto-merging within the balancer</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="silvia.surroca@mongodb.com">Silvia Surroca</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                    </labels>
                <created>Fri, 20 Jan 2023 13:02:56 +0000</created>
                <updated>Sun, 29 Oct 2023 21:27:43 +0000</updated>
                            <resolved>Mon, 20 Feb 2023 11:27:58 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5213472" author="xgen-internal-githook" created="Mon, 20 Feb 2023 10:54:52 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Silvia Surroca&apos;, &apos;email&apos;: &apos;silvia.surroca@mongodb.com&apos;, &apos;username&apos;: &apos;silviasuhu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-73126&quot; title=&quot;Integrate auto-merging within the balancer&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-73126&quot;&gt;&lt;del&gt;SERVER-73126&lt;/del&gt;&lt;/a&gt; Integrate auto-merging within the balancer&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/afb0f1ac441d9f1bd3b5a9c35dabd25c9133c93a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/afb0f1ac441d9f1bd3b5a9c35dabd25c9133c93a&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="2019385">SERVER-65332</issuekey>
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            <issuelink>
            <issuekey id="2264258">SERVER-73987</issuekey>
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            <issuekey id="2249607">SERVER-73515</issuekey>
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            <issuekey id="2381149">SERVER-78569</issuekey>
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