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    <title>MongoDB Jira</title>
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    <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-66621] Primary node stuck waiting for secondary to finish indexBuild when downgrading from 4.4 to 4.2</title>
                <link>https://jira.mongodb.org/browse/SERVER-66621</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In versions 4.4 and up, we support two-phase index builds meaning that a primary will wait to fully commit an index until the index is built on all secondaries. This is not the case on 4.2; secondaries will not build the index and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e961f38055121370927ec172007cbd829ccc3014/src/mongo/db/repl/oplog.cpp#L817-L819&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;effectively ignore the &quot;startIndexBuild&quot; oplog entry&lt;/a&gt;.&#160;&lt;/p&gt;

&lt;p&gt;There is a race condition on the primary when setting the index build protocol (single/two-phase) and downgrading the FCV which takes a global lock (whereas setting the protocol does not). So, if the index build protocol is set to two-phase and then we downgrade (on the primary), and then the secondary downgrades before building the index, the primary will wait for a response from the secondary signifying the index was built, but the secondary (on version 4.2 with the single index build protocol) will not build it. &lt;/p&gt;</description>
                <environment></environment>
        <key id="2051715">SERVER-66621</key>
            <summary>Primary node stuck waiting for secondary to finish indexBuild when downgrading from 4.4 to 4.2</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="fausto.leyva@mongodb.com">Fausto Leyva</assignee>
                                    <reporter username="fausto.leyva@mongodb.com">Fausto Leyva</reporter>
                        <labels>
                    </labels>
                <created>Fri, 20 May 2022 17:32:50 +0000</created>
                <updated>Sun, 29 Oct 2023 21:38:00 +0000</updated>
                            <resolved>Mon, 11 Jul 2022 18:17:58 +0000</resolved>
                                    <version>4.4.13</version>
                                    <fixVersion>4.4.16</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4671056" author="xgen-internal-githook" created="Mon, 11 Jul 2022 16:30:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Faustoleyva54&apos;, &apos;email&apos;: &apos;fausto.leyva@mongodb.com&apos;, &apos;username&apos;: &apos;Faustoleyva54&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66621&quot; title=&quot;Primary node stuck waiting for secondary to finish indexBuild when downgrading from 4.4 to 4.2&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66621&quot;&gt;&lt;del&gt;SERVER-66621&lt;/del&gt;&lt;/a&gt; Add additional check for two phase index build support&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ed8fb871a38e4cb682e2e499922ef17d079eefc2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ed8fb871a38e4cb682e2e499922ef17d079eefc2&lt;/a&gt;&lt;/p&gt;</comment>
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