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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-42573] Only warn about readConcernMajority enabled in primary-secondary-arbiter configuration</title>
                <link>https://jira.mongodb.org/browse/SERVER-42573</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hello,&lt;/p&gt;

&lt;p&gt;The startup warning about &quot;Read Concern Majority&quot; is shown when the users have an arbiter, regardless of the number of nodes. If we check the &lt;a href=&quot;https://docs.mongodb.com/v3.6/reference/read-concern-majority/#disable-read-concern-majority&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;documentation&lt;/a&gt;, it is only recommended when the replica set is PSA.&lt;/p&gt;

&lt;p&gt;&quot;If you are using a deployment other than a 3-member PSA, you do not need to disable read concern majority.&quot;&lt;/p&gt;

&lt;p&gt;When the warning was created on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37557&quot; title=&quot;Add startup warning about enableMajorityReadConcern and usage of arbiters&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37557&quot;&gt;&lt;del&gt;SERVER-37557&lt;/del&gt;&lt;/a&gt; it was decided to alert when an arbiter was present, regardless on the replica set configuration:&lt;/p&gt;

&lt;p&gt;&quot;the risk exists in any set with an arbiter, since they allow you to accept writes when the majority commit point cannot move forward. We are going to recommend all sets with arbiters use enableMajorityReadConcern:&quot;false&quot;.&quot;&lt;/p&gt;

&lt;p&gt;So, the warning is not following the documentation, and this could be confusing to the MongoDB users.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Miguel.&lt;/p&gt;</description>
                <environment></environment>
        <key id="881902">SERVER-42573</key>
            <summary>Only warn about readConcernMajority enabled in primary-secondary-arbiter configuration</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="xuerui.fa@mongodb.com">Xuerui Fa</assignee>
                                    <reporter username="miguel.nieto@mongodb.com">Miguel Angel Nieto</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Thu, 1 Aug 2019 09:11:11 +0000</created>
                <updated>Sun, 29 Oct 2023 22:18:29 +0000</updated>
                            <resolved>Mon, 14 Oct 2019 15:30:23 +0000</resolved>
                                                    <fixVersion>3.6.17</fixVersion>
                    <fixVersion>4.3.1</fixVersion>
                    <fixVersion>4.2.3</fixVersion>
                    <fixVersion>4.0.16</fixVersion>
                                                        <votes>0</votes>
                                    <watches>18</watches>
                                                                                                                <comments>
                            <comment id="2782500" author="xgen-internal-githook" created="Tue, 4 Feb 2020 15:04:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Xuerui Fa&apos;, &apos;username&apos;: &apos;XueruiFa&apos;, &apos;email&apos;: &apos;xuerui.fa@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42573&quot; title=&quot;Only warn about readConcernMajority enabled in primary-secondary-arbiter configuration&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42573&quot;&gt;&lt;del&gt;SERVER-42573&lt;/del&gt;&lt;/a&gt; Only warn about enableReadConcernMajority if PSA architecture&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 897ebf0eb55ffc68ef4c09aefc43a48bca82df3d)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/073da4c9ef0e5c23c3eb3e8094630191a646de58&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/073da4c9ef0e5c23c3eb3e8094630191a646de58&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2782487" author="xgen-internal-githook" created="Tue, 4 Feb 2020 15:00:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Xuerui Fa&apos;, &apos;username&apos;: &apos;XueruiFa&apos;, &apos;email&apos;: &apos;xuerui.fa@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42573&quot; title=&quot;Only warn about readConcernMajority enabled in primary-secondary-arbiter configuration&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42573&quot;&gt;&lt;del&gt;SERVER-42573&lt;/del&gt;&lt;/a&gt; Only warn about enableReadConcernMajority if PSA architecture&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 897ebf0eb55ffc68ef4c09aefc43a48bca82df3d)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/785d9ca956fabd2e7430884f5270393bd491ab5b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/785d9ca956fabd2e7430884f5270393bd491ab5b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2782462" author="xgen-internal-githook" created="Tue, 4 Feb 2020 14:53:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Xuerui Fa&apos;, &apos;username&apos;: &apos;XueruiFa&apos;, &apos;email&apos;: &apos;xuerui.fa@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42573&quot; title=&quot;Only warn about readConcernMajority enabled in primary-secondary-arbiter configuration&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42573&quot;&gt;&lt;del&gt;SERVER-42573&lt;/del&gt;&lt;/a&gt; Only warn about enableReadConcernMajority if PSA architecture&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 897ebf0eb55ffc68ef4c09aefc43a48bca82df3d)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/21899f6bd537399e00dd86833d185b1ebd1fffe9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/21899f6bd537399e00dd86833d185b1ebd1fffe9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2480281" author="evin.roesle" created="Mon, 14 Oct 2019 14:41:40 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alyson.cabral&quot; class=&quot;user-hover&quot; rel=&quot;alyson.cabral&quot;&gt;alyson.cabral&lt;/a&gt; and I spoke with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=spencer.brown&quot; class=&quot;user-hover&quot; rel=&quot;spencer.brown&quot;&gt;spencer.brown&lt;/a&gt; on Friday about this ticket. We discussed how the business cost of customers not being able to utilize core features when readConcernMajority disabled outweighs the support cost so we agreed to minimize the number of clusters and recommend disabling this flag. We will move forward with backporting.&lt;/p&gt;</comment>
                            <comment id="2428106" author="nicholas.cottrell" created="Mon, 23 Sep 2019 14:29:59 +0000"  >&lt;p&gt;This causes quite a few &quot;false positives&quot; and pushes some customers to disable RCM completely. If this is not a risky change, please backport.&lt;/p&gt;</comment>
                            <comment id="2409960" author="xgen-internal-githook" created="Fri, 6 Sep 2019 00:55:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;XueruiFa&apos;, &apos;email&apos;: &apos;xuerui.fa@mongodb.com&apos;, &apos;name&apos;: &apos;Xuerui Fa&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42573&quot; title=&quot;Only warn about readConcernMajority enabled in primary-secondary-arbiter configuration&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42573&quot;&gt;&lt;del&gt;SERVER-42573&lt;/del&gt;&lt;/a&gt; Only warn about enableReadConcernMajority if PSA architecture&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/897ebf0eb55ffc68ef4c09aefc43a48bca82df3d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/897ebf0eb55ffc68ef4c09aefc43a48bca82df3d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2362790" author="jesse" created="Thu, 8 Aug 2019 13:38:21 +0000"  >&lt;p&gt;There&apos;s no way to disable the warning, but this will be fixed in the next version to warn only in PSA deployments.&lt;/p&gt;</comment>
                            <comment id="2362261" author="sachin.yadav@adp.com" created="Thu, 8 Aug 2019 03:21:47 +0000"  >&lt;p&gt;but i am getting warning in replica set with multiple secondary (Not PSA deployment).&lt;/p&gt;

&lt;p&gt;will this be fixed in next version or there is a method to disable the warning .&lt;/p&gt;</comment>
                            <comment id="2358422" author="jesse" created="Mon, 5 Aug 2019 20:01:13 +0000"  >&lt;p&gt;After discussion we&apos;ve decided to stick with the recommendation in the docs: we recommend users disable majority read concern in PSA deployments, but we don&apos;t have a strong recommendation for other deployments with arbiters. So we&apos;ll only show the warning in PSA.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="616753">SERVER-37557</issuekey>
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            <issuekey id="918125">SERVER-43188</issuekey>
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