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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>
    </build-info>


<item>
            <title>[SERVER-48050] FCV should be initialized before attempting to restart in-progress index builds</title>
                <link>https://jira.mongodb.org/browse/SERVER-48050</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When a &lt;tt&gt;mongod&lt;/tt&gt; restarts and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2d00fa0708dc62593d387cc09eab46f5a2ba8c9f/src/mongo/db/repair_database_and_check_version.cpp#L385&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;attempts to rebuild its unfinished indexes&lt;/a&gt;, it does so &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2d00fa0708dc62593d387cc09eab46f5a2ba8c9f/src/mongo/db/repair_database_and_check_version.cpp#L545-L546&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;before the FCV version has been initialized&lt;/a&gt;. When the in-progress index specs are validated, therefore, the index comparison &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a709403384c88487ed34c940be1f5e3b7d12646e/src/mongo/db/index/index_descriptor.cpp#L198-L201&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;defaults to the FCV 4.4 behaviour&lt;/a&gt; and does not distinguish the indexes based on their differing &lt;tt&gt;partialFilterExpressions&lt;/tt&gt;. This will &lt;a href=&quot;https://github.com/mongodb/mongo/blob/04bc9f02d9386e410df2dababa32704261ae0374/src/mongo/db/index_builds_coordinator.cpp#L503&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;cause an &lt;tt&gt;fassert&lt;/tt&gt;&lt;/a&gt; if any conflicting indexes exist.&lt;/p&gt;

&lt;p&gt;Similar issues have occurred before; see e.g. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45374&quot; title=&quot;Unique index that gets rebuilt as part of startup recovery/repair is using data format version as 6 or 8 and NOT 11 or 12.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45374&quot;&gt;&lt;del&gt;SERVER-45374&lt;/del&gt;&lt;/a&gt;. After speaking with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=louis.williams&quot; class=&quot;user-hover&quot; rel=&quot;louis.williams&quot;&gt;louis.williams&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=daniel.gottlieb&quot; class=&quot;user-hover&quot; rel=&quot;daniel.gottlieb&quot;&gt;daniel.gottlieb&lt;/a&gt;, the consensus is that the proper solution would be to ensure that the FCV is always initialized before attempting any index validation.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1344779">SERVER-48050</key>
            <summary>FCV should be initialized before attempting to restart in-progress index builds</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="bernard.gorman@mongodb.com">Bernard Gorman</reporter>
                        <labels>
                    </labels>
                <created>Fri, 8 May 2020 17:03:39 +0000</created>
                <updated>Sun, 29 Oct 2023 22:08:29 +0000</updated>
                            <resolved>Mon, 20 Jul 2020 17:59:24 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="3292975" author="xgen-internal-githook" created="Mon, 20 Jul 2020 17:55:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48050&quot; title=&quot;FCV should be initialized before attempting to restart in-progress index builds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48050&quot;&gt;&lt;del&gt;SERVER-48050&lt;/del&gt;&lt;/a&gt; FCV should be initialized before attempting to restart in-progress index builds&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Refactored repairDatabaseAndCheckVersion by moving FCV logic into&lt;br/&gt;
  the FeatureCompatibilityVersion class&lt;/li&gt;
	&lt;li&gt;Refactored repairDatabaseAndCheckVersion by separating procedures of&lt;br/&gt;
  regular recovery, read-only mode, and repair&lt;/li&gt;
	&lt;li&gt;Renamed repairDatabaseAndCheckVersion to repairAndRecoverDatabases&lt;/li&gt;
	&lt;li&gt;Moved startup recovery/repair free function into a &apos;startup_recovery&apos; namespace&lt;/li&gt;
	&lt;li&gt;Moved repair free functions into a &apos;repair&apos; namespace.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;renamed:    src/mongo/db/repair_database_and_check_version.cpp -&amp;gt; src/mongo/db/startup_recovery.cpp&lt;br/&gt;
renamed:    src/mongo/db/repair_database_and_check_version.h -&amp;gt; src/mongo/db/startup_recovery.h&lt;br/&gt;
renamed:    src/mongo/db/repair_database.cpp -&amp;gt; src/mongo/db/repair.cpp&lt;br/&gt;
renamed:    src/mongo/db/repair_database.h -&amp;gt; src/mongo/db/repair.h&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d0e0220787fa127e0fae9d0c9f691316bd1eb6db&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d0e0220787fa127e0fae9d0c9f691316bd1eb6db&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3270263" author="siyuan.zhou@10gen.com" created="Sun, 5 Jul 2020 20:21:52 +0000"  >&lt;p&gt;Thanks &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bernard.gorman&quot; class=&quot;user-hover&quot; rel=&quot;bernard.gorman&quot;&gt;bernard.gorman&lt;/a&gt;&#160;for the explanation of the use case. It is very helpful!&lt;/p&gt;</comment>
                            <comment id="3270124" author="bernard.gorman" created="Sat, 4 Jul 2020 15:23:00 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=siyuan.zhou&quot; class=&quot;user-hover&quot; rel=&quot;siyuan.zhou&quot;&gt;siyuan.zhou&lt;/a&gt;, I think the comment you linked has caused some confusion:&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;// The partialFilterExpression is only part of the index signature if FCV has been set to 4.6.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;This does not mean that the &lt;tt&gt;partialFilterExpression&lt;/tt&gt; parameter is only &lt;b&gt;available&lt;/b&gt; in FCV 4.6 - partial indexes were added in 3.2. Rather, it means that in FCV 4.6 &lt;tt&gt;partialFilterExpression&lt;/tt&gt; has been made part of the index &lt;b&gt;signature&lt;/b&gt;; that is, the subset of parameters that uniquely identify an index.&lt;/p&gt;

&lt;p&gt;Prior to 4.6, only the keyPattern and collation were part of the index signature. As a result, the following two indexes could not coexist, as they were considered to conflict with each other:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{keyPattern: {a: 1}, partialFilterExpression: {a: {$gte: 0}}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{keyPattern: {a: 1}, partialFilterExpression: {a: {$lt: 0}}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&lt;/tbody&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;In 4.6, multiple indexes which differ only by &lt;tt&gt;partialFilterExpression&lt;/tt&gt; are allowed to coexist together. The FCV is actually used to enforce exactly the behaviour you mentioned above:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;You can only &lt;b&gt;create&lt;/b&gt; indexes that differ by &lt;tt&gt;partialFilterExpression&lt;/tt&gt; in FCV 4.6, since on 4.4 these would be considered invalid duplicate indexes.&lt;/li&gt;
	&lt;li&gt;But if you downgrade the FCV to 4.4 while such an index is present, we will continue to support it. The planner can still use these indexes to answer queries that fall within the &lt;tt&gt;partialFilterExpression&lt;/tt&gt;.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;See &lt;a href=&quot;https://github.com/mongodb/mongo/commit/085ffeb310e8fed49739cf8443fcb13ea795d867#diff-4ac3794f4c41931ef73b25887f564a5f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this test&lt;/a&gt; which exercises the behaviour described above. The problem identified in this ticket is that, if the node restarts while an index is mid-build, it will re-check its signature against all existing indexes before resuming the build - but the FCV has not been set at this point, and so we interpret this as an attempt to create a conflicting index while in FCV 4.4 and throw.&lt;/p&gt;</comment>
                            <comment id="3267729" author="siyuan.zhou@10gen.com" created="Thu, 2 Jul 2020 04:02:19 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bernard.gorman&quot; class=&quot;user-hover&quot; rel=&quot;bernard.gorman&quot;&gt;bernard.gorman&lt;/a&gt;, as discussed with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=lingzhi.deng&quot; class=&quot;user-hover&quot; rel=&quot;lingzhi.deng&quot;&gt;lingzhi.deng&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jason.chan&quot; class=&quot;user-hover&quot; rel=&quot;jason.chan&quot;&gt;jason.chan&lt;/a&gt; in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48044&quot; title=&quot;FCV::isVersion should invariant if FCV is unset&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48044&quot;&gt;&lt;del&gt;SERVER-48044&lt;/del&gt;&lt;/a&gt;, I&apos;m curious why FCV is needed to decide whether to &lt;b&gt;support&lt;/b&gt; a feature. As &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a709403384c88487ed34c940be1f5e3b7d12646e/src/mongo/db/index/index_descriptor.cpp#L198-L201&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the comment says&lt;/a&gt;, when the index isPartial(), it must have been set to 4.6. Is it possible to support the feature without checking FCV?&lt;/p&gt;

&lt;p&gt;I&apos;m attempting to understand the best practice of using FCV. My understanding is that upgrade / downgrade is done in two phases.&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;&lt;b&gt;Support&lt;/b&gt; both old and new behaviors by upgrading the binary.&lt;/li&gt;
	&lt;li&gt;&lt;b&gt;Enable&lt;/b&gt; the new behavior actively by setting a new FCV.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;As an example of (1), in replication, we tend to support a feature whenever it&apos;s requested by another node regardless of FCV. For example, a newly introduced field of a request in 4.4 should be respected even if the 4.4 node is on 4.2 FCV. This mixed-version scenario is inevitable on upgrade of replset members. As an example of (2), user-requested behavior only &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8100fd85b68031907520613ac686e52588835bd3/src/mongo/db/repl/replication_coordinator_impl.cpp#L3255&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;enables a feature on FCV 4.4&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;The usage of FCV in this ticket seems different from that. I&apos;d really appreciate your insights on that. With that being said, I totally agree FCV should be initialized as early as possible regardless.&lt;/p&gt;</comment>
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