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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-79335] Audit gFeatureFlagColumnstoreIndexes</title>
                <link>https://jira.mongodb.org/browse/SERVER-79335</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This ticket has been split from an audit of all Query 7.0 feature flags. This ticket is a request to audit gFeatureFlagColumnstoreIndexes.&lt;/p&gt;

&lt;p&gt;Intial sync can &lt;a href=&quot;https://github.com/10gen/mongo/blob/d13faac6def5a42bad3e1ac6d91d9d5ce805f0d2/src/mongo/db/repl/initial_syncer.cpp#L696&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;temporarily reset&lt;/a&gt; the fcv value to uninitialized and sets the new value afterwards. This can cause call sites trying to inspect the fcv value to hit &lt;a href=&quot;https://github.com/10gen/mongo/blob/07efe95e998e3f8305c4ec215761e0ec7b9e8012/src/mongo/db/server_options.h#L147&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this invariant&lt;/a&gt;. We need to audit feature flag usage and determine which should do one of the following:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;It can never be called when initial sync is running. So do nothing. Note that this can be tricky to prove as we once thought the catalog cache loader can never be run while initial sync is happening but it can.&lt;/li&gt;
	&lt;li&gt;It is safe to ignore fcv version so use isEnabledAndIgnoreFCVUnsafe instead&lt;/li&gt;
	&lt;li&gt;It is safe to turn off the feature anytime (even if feature flag is actually on) so use isEnabledUseDefaultFCVWhenUninitialized instead.&lt;/li&gt;
	&lt;li&gt;Special logic is needed if fcv is not initialized&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2400604">SERVER-79335</key>
            <summary>Audit gFeatureFlagColumnstoreIndexes</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="ian.boros@mongodb.com">Ian Boros</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Tue, 25 Jul 2023 19:42:49 +0000</created>
                <updated>Sun, 29 Oct 2023 21:18:28 +0000</updated>
                            <resolved>Wed, 20 Sep 2023 14:24:26 +0000</resolved>
                                                    <fixVersion>7.0.3</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5716436" author="xgen-internal-githook" created="Tue, 19 Sep 2023 21:26:19 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Ian Boros&apos;, &apos;email&apos;: &apos;87138302+borosaurus@users.noreply.github.com&apos;, &apos;username&apos;: &apos;borosaurus&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79335&quot; title=&quot;Audit gFeatureFlagColumnstoreIndexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79335&quot;&gt;&lt;del&gt;SERVER-79335&lt;/del&gt;&lt;/a&gt; Make CSI feature flag check safe when FCV becomes uninitialized&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b02c91f3948f1f70c17ecc5946d80f7ccee656e1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b02c91f3948f1f70c17ecc5946d80f7ccee656e1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5690089" author="kyle.suarez" created="Fri, 8 Sep 2023 15:32:26 +0000"  >&lt;p&gt;I am now repurposing this ticket to just be about gFeatureFlagColumnstoreIndexes.&lt;/p&gt;

&lt;p&gt;The original list of all feature flags has been split into separate tickets:&lt;br/&gt;
gFeatureFlagChangeStreamsFurtherEnrichedEvents&lt;br/&gt;
gFeatureFlagCommonQueryFramework&lt;br/&gt;
gFeatureFlagCompoundWildcardIndexes&lt;br/&gt;
gFeatureFlagServerlessChangeStreams&lt;br/&gt;
gFeatureFlagTelemetry&lt;br/&gt;
gFeatureFlagBucketUnpackWithSort&lt;br/&gt;
gFeatureFlagShardedTimeSeries&lt;br/&gt;
gFeatureFlagColumnstoreIndexes&lt;/p&gt;</comment>
                            <comment id="5595321" author="renctan" created="Thu, 27 Jul 2023 13:40:34 +0000"  >&lt;p&gt;Add gFeatureFlagTelemetry&lt;/p&gt;</comment>
                    </comments>
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                                                                <inwardlinks description="is related to">
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            <issuekey id="2400400">SERVER-79317</issuekey>
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