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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-29452] Handle missing featureCompatibilityVersion document during startup</title>
                <link>https://jira.mongodb.org/browse/SERVER-29452</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The proposed implementation for this ticket follows:&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;Startupbehaviorwithoutrepair&quot;&gt;&lt;/a&gt;Startup behavior without --repair&lt;/h3&gt;
&lt;p&gt;Fail to start up. If some/all collections have UUIDs set, advise to repair. If no collections have UUIDs, advise to first upgrade to 3.4&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;Startupbehaviorwithrepair&quot;&gt;&lt;/a&gt;Startup behavior with --repair&lt;/h3&gt;
&lt;p&gt;If there are no collections with UUIDs, advise users to first upgrade to 3.4 and fail. This would occur when the featureCompatibilityVersion document is missing for 3.4 users who have not begun upgrading to 3.6 and 3.2 users.&lt;/p&gt;

&lt;p&gt;If no admin.system.version collection exists, create one without UUID.&lt;/p&gt;

&lt;p&gt;If only some collections have UUIDs, upsert the following document into admin.system.version:&lt;/p&gt;
   { featureCompatibilityVersion: &quot;3.4&quot;, targetVersion: &quot;3.6&quot; }
&lt;p&gt;This would occur if we were running featureCompatibilityVersion 3.6 but accidentally deleted either the admin.system.version collection or the admin database, or if we were in the middle of a 3.4 to 3.6 schema upgrade and deleted the featureCompatibilityVersion document.&lt;/p&gt;

&lt;p&gt;If all collections have UUIDs, including admin.system.version, upsert the following document into admin.system.version:&lt;/p&gt;
  { featureCompatibilityVersion: &quot;3.6&quot; }
&lt;p&gt;We interpret the database as being fully upgraded to featureCompatibilityVersion 3.6, and we insert a featureCompatibilityVersion 3.6 document into the admin.system.version collection. This case would only occur if we were running featureCompatibilityVersion 3.6 and the featureCompatibilityVersion document were accidentally removed or corrupted.&lt;/p&gt;</description>
                <environment></environment>
        <key id="390548">SERVER-29452</key>
            <summary>Handle missing featureCompatibilityVersion document during startup</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="maria.vankeulen@mongodb.com">Maria van Keulen</assignee>
                                    <reporter username="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
                    </labels>
                <created>Tue, 6 Jun 2017 13:49:46 +0000</created>
                <updated>Mon, 30 Oct 2023 23:16:23 +0000</updated>
                            <resolved>Tue, 17 Oct 2017 13:47:00 +0000</resolved>
                                                    <fixVersion>3.6.0-rc1</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1705224" author="xgen-internal-githook" created="Fri, 20 Oct 2017 20:10:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;maria@mongodb.com&apos;, &apos;name&apos;: &apos;Maria van Keulen&apos;, &apos;username&apos;: &apos;mvankeulen94&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29452&quot; title=&quot;Handle missing featureCompatibilityVersion document during startup&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29452&quot;&gt;&lt;del&gt;SERVER-29452&lt;/del&gt;&lt;/a&gt; Correctly obtain the UUID of a collection in setfcv test&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e739ab399cc3072158e90141334ac00957c07e6f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e739ab399cc3072158e90141334ac00957c07e6f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1701396" author="xgen-internal-githook" created="Tue, 17 Oct 2017 16:19:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;maria@mongodb.com&apos;, &apos;name&apos;: &apos;Maria van Keulen&apos;, &apos;username&apos;: &apos;mvankeulen94&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29452&quot; title=&quot;Handle missing featureCompatibilityVersion document during startup&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29452&quot;&gt;&lt;del&gt;SERVER-29452&lt;/del&gt;&lt;/a&gt; Reduce the size of dur_checksum journal files&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/eda6220cbf62a679c2db6a9bc925d3187f0a9b0f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/eda6220cbf62a679c2db6a9bc925d3187f0a9b0f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1701369" author="maria.vankeulen" created="Tue, 17 Oct 2017 16:06:07 +0000"  >&lt;p&gt;Fix to reduce the size of the dur_checksum journal files:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/eda6220cbf62a679c2db6a9bc925d3187f0a9b0f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/eda6220cbf62a679c2db6a9bc925d3187f0a9b0f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1700686" author="xgen-internal-githook" created="Mon, 16 Oct 2017 21:46:46 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;maria@mongodb.com&apos;, &apos;name&apos;: &apos;Maria van Keulen&apos;, &apos;username&apos;: &apos;mvankeulen94&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29452&quot; title=&quot;Handle missing featureCompatibilityVersion document during startup&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29452&quot;&gt;&lt;del&gt;SERVER-29452&lt;/del&gt;&lt;/a&gt; Handle missing featureCompatibilityVersion document&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c9ca12d30bbfff9abc1717f2460b8a54f965bf89&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c9ca12d30bbfff9abc1717f2460b8a54f965bf89&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1693154" author="ian@10gen.com" created="Mon, 9 Oct 2017 15:57:13 +0000"  >&lt;p&gt;Bumping to GA required based on 9/29 convo with Eric and 10/9 convo with Spencer.&lt;/p&gt;</comment>
                            <comment id="1685134" author="maria.vankeulen" created="Fri, 29 Sep 2017 13:47:20 +0000"  >&lt;p&gt; The work for refusing to initial sync from nodes reporting fcv &amp;lt; 3.4 will now be done in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31254&quot; title=&quot;Fail initial sync if fCV targetVersion is set or if there is no fCV document&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31254&quot;&gt;&lt;del&gt;SERVER-31254&lt;/del&gt;&lt;/a&gt;. &lt;/p&gt;</comment>
                            <comment id="1681864" author="maria.vankeulen" created="Tue, 26 Sep 2017 13:49:00 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tess.avitabile&quot; class=&quot;user-hover&quot; rel=&quot;tess.avitabile&quot;&gt;tess.avitabile&lt;/a&gt; The &lt;tt&gt;targetVersion&lt;/tt&gt; field will be added as part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31209&quot; title=&quot;need to store upgrade/downgrade in progress for sharding&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31209&quot;&gt;&lt;del&gt;SERVER-31209&lt;/del&gt;&lt;/a&gt; because sharding needs a durable representation of whether there is an upgrade or downgrade in progress. &lt;/p&gt;</comment>
                            <comment id="1681844" author="tess.avitabile" created="Tue, 26 Sep 2017 13:38:20 +0000"  >&lt;p&gt;When do we use the &lt;tt&gt;targetVersion&lt;/tt&gt; field?&lt;/p&gt;</comment>
                            <comment id="1646437" author="tess.avitabile" created="Fri, 11 Aug 2017 17:17:47 +0000"  >&lt;p&gt;That would work.&lt;/p&gt;</comment>
                            <comment id="1646417" author="schwerin" created="Fri, 11 Aug 2017 17:08:34 +0000"  >&lt;p&gt;Maybe we should just refuse to initial sync from nodes reporting fcv &amp;lt; 3.4?&lt;/p&gt;</comment>
                            <comment id="1646324" author="tess.avitabile" created="Fri, 11 Aug 2017 15:46:55 +0000"  >&lt;p&gt;We should also cover the case where you start a fresh 3.6 node and initial sync and do not receive a featureCompatibilityVersion document. The 3.6 node should also fassert in this case.&lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="432629">SERVER-31254</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="390549">SERVER-29453</issuekey>
        </issuelink>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="487502">SERVER-32909</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="547254">SERVER-35136</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="711990">SERVER-40009</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="386494">SERVER-29350</issuekey>
        </issuelink>
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