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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-28796] remove check in CollectionShardingState::onDropCollection that prevents &apos;config.version&apos; from being dropped</title>
                <link>https://jira.mongodb.org/browse/SERVER-28796</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="373923">SERVER-28796</key>
            <summary>remove check in CollectionShardingState::onDropCollection that prevents &apos;config.version&apos; from being dropped</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="13202">Works as Designed</resolution>
                                        <assignee username="backlog-server-sharding-emea">[DO NOT USE] Backlog - Sharding EMEA</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                            <label>bkp</label>
                    </labels>
                <created>Thu, 13 Apr 2017 20:06:06 +0000</created>
                <updated>Fri, 27 Oct 2023 13:54:30 +0000</updated>
                            <resolved>Thu, 1 Apr 2021 08:58:10 +0000</resolved>
                                    <version>3.4.3</version>
                    <version>3.5.5</version>
                                                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="3695693" author="kaloian.manassiev" created="Thu, 1 Apr 2021 08:58:10 +0000"  >&lt;p&gt;Dropping any of the &lt;tt&gt;config&lt;/tt&gt; collections on a running cluster is never safe so we will not start allowing it. The workaround would be to start the config server in a standalone mode (without the &lt;tt&gt;--configsvr&lt;/tt&gt; parameter) and restore manually the config collections.&lt;/p&gt;</comment>
                            <comment id="2100507" author="animeshsi" created="Wed, 26 Dec 2018 21:42:04 +0000"  >&lt;p&gt;Hi Mongo Team,&lt;/p&gt;

&lt;p&gt;Even I hit the same issue when restoring config server in v3.4&lt;br/&gt;
Is there a work-around for restoring config servers from a mongodump file until this issue is fixed ?&lt;/p&gt;

&lt;p&gt;We have been struggling to migrate to v3.4 from v3.2 but this issue is a critical one we need to figure out before we make the jump to v3.4&lt;/p&gt;</comment>
                            <comment id="1787478" author="gdecicco" created="Mon, 29 Jan 2018 11:33:12 +0000"  >&lt;p&gt;Hello,&lt;br/&gt;
I got in this issue also in version 3.6.2.&lt;/p&gt;

&lt;p&gt;I tried as workaround to restore the first time with the flag &quot;--drop&quot; and after the error, I&apos;ve executed again without the flag.&lt;/p&gt;

&lt;p&gt;Everything seems working, but based on your deeper knowledge, there might be some other problem related to this workaround?&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Gianluca&lt;/p&gt;</comment>
                            <comment id="1549242" author="esha.maharishi@10gen.com" created="Fri, 14 Apr 2017 14:16:30 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=csjpeter&quot; class=&quot;user-hover&quot; rel=&quot;csjpeter&quot;&gt;csjpeter&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;It&apos;s true that the running config server will have generated a config.version document.&lt;/p&gt;

&lt;p&gt;However, if the intent is to restore the entire config server through mongorestore, it is correct to replace the config.version document with the one in the backup.&lt;/p&gt;

&lt;p&gt;Note that this means the shards should also be restored from a full backup, so that the &lt;tt&gt;clusterId&lt;/tt&gt; field in each shard&apos;s shardIdentity document matches the &lt;tt&gt;version&lt;/tt&gt; field in the config&apos;s version document.&lt;/p&gt;

&lt;p&gt;(The check was there to prevent users from accidentally deleting the version document).&lt;/p&gt;</comment>
                            <comment id="1549076" author="csjpeter" created="Fri, 14 Apr 2017 04:41:06 +0000"  >&lt;p&gt;Hello Reporter,&lt;/p&gt;

&lt;p&gt;Will there be a check if the dumped version is compatible with the one to overwrite?&lt;br/&gt;
What will happen in case of incompatibility?&lt;br/&gt;
I merely guess that the check is/were there to avoid restoring of old (incompatible) dumps on newer mongo setup.&lt;/p&gt;

&lt;p&gt;Bests,&lt;br/&gt;
Peter&lt;/p&gt;</comment>
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