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    <title>MongoDB Jira</title>
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    <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-62636] setFeatureCompatibilityVersion 4.4 succeeds on 5.0 binVersion that has indexes with conflicting options</title>
                <link>https://jira.mongodb.org/browse/SERVER-62636</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/fb4b3eba611b3bc2408cc3e86fa1d1cba9085fde/src/mongo/db/catalog/index_catalog_impl.cpp#L879-L892&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;IndexCatalogImpl::&amp;#95;doesSpecConflictWithExisting()&lt;/a&gt; throws an exception if an index with conflicting options is attempted to be created while in FCV 4.4. However, a node undergoing initial sync will also call that function and (depending on whether the admin.system.version collection has already been cloned) would fail its initial sync attempt and eventually exhaust its retries.&lt;/p&gt;

&lt;p/&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;[js_test:repro_initial_sync_index_option_conflict] d20021| {&quot;t&quot;:{&quot;$date&quot;:&quot;2022-01-14T01:11:15.770+00:00&quot;},&quot;s&quot;:&quot;E&quot;,  &quot;c&quot;:&quot;REPL&quot;,     &quot;id&quot;:21416,   &quot;ctx&quot;:&quot;ReplCoordExtern-2&quot;,&quot;msg&quot;:&quot;Initial sync failed, shutting down now. Restart the server to attempt a new initial sync&quot;}&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[js_test:repro_initial_sync_index_option_conflict] d20021| {&quot;t&quot;:{&quot;$date&quot;:&quot;2022-01-14T01:11:15.770+00:00&quot;},&quot;s&quot;:&quot;F&quot;,  &quot;c&quot;:&quot;-&quot;,        &quot;id&quot;:23095,   &quot;ctx&quot;:&quot;ReplCoordExtern-2&quot;,&quot;msg&quot;:&quot;Fatal assertion&quot;,&quot;attr&quot;:{&quot;msgid&quot;:40088,&quot;error&quot;:&quot;InitialSyncFailure: error cloning databases :: caused by :: IndexOptionsConflict: Error cloning collection &apos;test.mycoll&apos; :: caused by :: An equivalent index already exists with a different name and options. Requested index: { v: 2, unique: true, key: { x: 1.0 }, name: \&quot;x2\&quot; }, existing index: { v: 2, key: { x: 1.0 }, name: \&quot;x1\&quot;, sparse: true }&quot;,&quot;file&quot;:&quot;src/mongo/db/repl/replication_coordinator_impl.cpp&quot;,&quot;line&quot;:782}}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="1963819">SERVER-62636</key>
            <summary>setFeatureCompatibilityVersion 4.4 succeeds on 5.0 binVersion that has indexes with conflicting options</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="denis.grebennicov@mongodb.com">Denis Grebennicov</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                    </labels>
                <created>Fri, 14 Jan 2022 01:22:26 +0000</created>
                <updated>Sun, 29 Oct 2023 21:44:07 +0000</updated>
                            <resolved>Sun, 21 Aug 2022 22:02:54 +0000</resolved>
                                    <version>5.0.0</version>
                                    <fixVersion>5.0.12</fixVersion>
                                    <component>Catalog</component>
                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="4293986" author="kyle.suarez" created="Fri, 14 Jan 2022 19:31:09 +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;, we discussed this in North America triage &amp;#8211; it sounds related to some of your work and we are going to defer to you and EMEA to triage this ticket.&lt;/p&gt;</comment>
                            <comment id="4293045" author="kyle.suarez" created="Fri, 14 Jan 2022 14:52:40 +0000"  >&lt;p&gt;Speaking with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=max.hirschhorn&quot; class=&quot;user-hover&quot; rel=&quot;max.hirschhorn&quot;&gt;max.hirschhorn&lt;/a&gt; offline, he believes that we should make &lt;tt&gt;setFCV()&lt;/tt&gt; fail to downgrade FCV if there are ambiguous indexes in the last-LTS FCV.&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="1499493">SERVER-51333</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="300613">SERVER-25023</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1321726">SERVER-47657</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1322111">SERVER-47659</issuekey>
        </issuelink>
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