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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-43990] A command to confirm that all chunks have been moved to the right zone after the initial split</title>
                <link>https://jira.mongodb.org/browse/SERVER-43990</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There is a grey area between the chunks be created and when they move and are owned by the appropriate zone. Users would like to confirm that the chunks are placed according to the zone definition before inserting data.&#160;&lt;/p&gt;

&lt;p&gt;I recognize that this happens very quickly in the new initial split model, but this question still comes up fairly frequently. I&apos;d like to provide an easy way for atlas/users to check that it&apos;s safe to begin data insertion.&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="969046">SERVER-43990</key>
            <summary>A command to confirm that all chunks have been moved to the right zone after the initial split</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="marcos.grillo@mongodb.com">Marcos Jos&#233; Grillo Ramirez</assignee>
                                    <reporter username="alyson.cabral@mongodb.com">Alyson Cabral</reporter>
                        <labels>
                    </labels>
                <created>Mon, 14 Oct 2019 17:13:35 +0000</created>
                <updated>Sun, 29 Oct 2023 22:16:09 +0000</updated>
                            <resolved>Mon, 25 Nov 2019 11:55:02 +0000</resolved>
                                                    <fixVersion>4.3.3</fixVersion>
                                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="2564151" author="marcos.grillo" created="Mon, 25 Nov 2019 11:55:02 +0000"  >&lt;p&gt;The changes on the output can be tracked with the following ticket:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44818&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-44818&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2558291" author="xgen-internal-githook" created="Thu, 21 Nov 2019 10:55:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;marcos.grillo@10gen.com&apos;, &apos;name&apos;: &apos;Marcos Jos&#233; Grillo Ram&#237;rez&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43990&quot; title=&quot;A command to confirm that all chunks have been moved to the right zone after the initial split&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43990&quot;&gt;&lt;del&gt;SERVER-43990&lt;/del&gt;&lt;/a&gt; A command to confirm that all chunks have been moved to the right zone after the initial split&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f48da7a0f83762d214128799923e4bcede800dbe&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f48da7a0f83762d214128799923e4bcede800dbe&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2504749" author="sheeri.cabral" created="Mon, 28 Oct 2019 14:04:21 +0000"  >&lt;p&gt;1. The former is proper in the scope of this ticket. I like the idea of the latter, but if it takes a long time it should be moved to its own ticket. Because the scope of this ticket is to make sure checks are in the right zone. However, I do think it is useful to verify that shards are balanced properly.&lt;/p&gt;

&lt;p&gt;2. A cached view is good enough. The systems are constantly changing, so it doesn&#8217;t matter if it&#8217;s now, or cached from five minutes or an hour ago.&lt;/p&gt;</comment>
                            <comment id="2491480" author="kaloian.manassiev" created="Mon, 21 Oct 2019 06:12:59 +0000"  >&lt;p&gt;We can easily add such command, but I would like clarify a few things around its behaviour:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Do you want it to verify only for compliance with zones (i.e., no chunk needs to move because it&apos;s in the wrong zone) or is there also merit to expose check for chunks, which need to be moved because there&apos;s a draining shard or chunk imbalance? The latter specifically would allow answering whether all hashed sharding chunks been distributed correctly before starting a bulk load?&lt;/li&gt;
	&lt;li&gt;How important would it be to synchronise this command with concurrent changes to the zone configuration? It might be easier for such a command to use a cached view of the zones rather than take a lock a prevent zones from changing while it&apos;s running.&lt;/li&gt;
&lt;/ol&gt;
</comment>
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                            <customfieldvalue>There is a new command that works the following way:&lt;br/&gt;
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&lt;a href=&quot;https://docs.google.com/document/d/1LAsW5xOY4E6EUU7foBhLco-bqFpGx9wL9ORiPe7r2T0&quot;&gt;https://docs.google.com/document/d/1LAsW5xOY4E6EUU7foBhLco-bqFpGx9wL9ORiPe7r2T0&lt;/a&gt;</customfieldvalue>

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