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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-37557] Add startup warning about enableMajorityReadConcern and usage of arbiters</title>
                <link>https://jira.mongodb.org/browse/SERVER-37557</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We want to add a startup warning that alerts users if enableReadConcernMajority is set to true on a node that is part of a replica set that contains an arbiter. It will read as follows:&lt;/p&gt;

&lt;p&gt;&lt;em&gt;This replica set uses arbiters, but readConcern:majority is enabled for this node. This is not a recommended configuration. Please see &amp;lt;link to documentation&amp;gt;.&lt;/em&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="616753">SERVER-37557</key>
            <summary>Add startup warning about enableMajorityReadConcern and usage of arbiters</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="vesselina.ratcheva@mongodb.com">Vesselina Ratcheva</assignee>
                                    <reporter username="william.schultz@mongodb.com">William Schultz</reporter>
                        <labels>
                    </labels>
                <created>Wed, 10 Oct 2018 20:59:48 +0000</created>
                <updated>Sun, 29 Oct 2023 22:27:30 +0000</updated>
                            <resolved>Tue, 6 Nov 2018 18:43:20 +0000</resolved>
                                                    <fixVersion>3.6.10</fixVersion>
                    <fixVersion>4.0.5</fixVersion>
                    <fixVersion>4.1.5</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="2068936" author="tess.avitabile" created="Wed, 21 Nov 2018 14:17:22 +0000"  >&lt;p&gt;The warning will apply for all versions that support arbiters, so it sounds like there is no need to pin this to 4.2.&lt;/p&gt;</comment>
                            <comment id="2068549" author="kay.kim@10gen.com" created="Wed, 21 Nov 2018 00:03:02 +0000"  >&lt;p&gt;When 4.2 goes out, we will have &lt;a href=&quot;https://dochub.mongodb.org/core/psa-disable-rc-majority&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://dochub.mongodb.org/core/psa-disable-rc-majority&lt;/a&gt;   point to docs.mongodb.com/manual/.... (which will correspond to 4.2) and thereafter, it will point to the latest GA version.&lt;/p&gt;

&lt;p&gt;If that warning will no longer apply or differ for versions greater than 4.2, I can definitely have it pinned to 4.2 version.&lt;/p&gt;</comment>
                            <comment id="2067987" author="tess.avitabile" created="Tue, 20 Nov 2018 16:58:06 +0000"  >&lt;p&gt;No problem! I&apos;m not sure if we will need to update the master link in the future. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kay.kim&quot; class=&quot;user-hover&quot; rel=&quot;kay.kim&quot;&gt;kay.kim&lt;/a&gt;, what do you think?&lt;/p&gt;</comment>
                            <comment id="2067983" author="vesselina.ratcheva" created="Tue, 20 Nov 2018 16:56:11 +0000"  >&lt;p&gt;Question: would we need to eventually update the master link to say 4.2?&lt;/p&gt;</comment>
                            <comment id="2067973" author="xgen-internal-githook" created="Tue, 20 Nov 2018 16:53:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Vesselina Ratcheva&apos;, &apos;email&apos;: &apos;vesselina.ratcheva@10gen.com&apos;, &apos;username&apos;: &apos;vessy-mongodb&apos;}
&lt;p&gt;Message: &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; fix doc link&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c06a21f2efa258f8ea13ad1cda900b537ad00a94&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c06a21f2efa258f8ea13ad1cda900b537ad00a94&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2067963" author="xgen-internal-githook" created="Tue, 20 Nov 2018 16:47:21 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Vesselina Ratcheva&apos;, &apos;email&apos;: &apos;vesselina.ratcheva@10gen.com&apos;, &apos;username&apos;: &apos;vessy-mongodb&apos;}
&lt;p&gt;Message: &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; fix doc link&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4bc36a8707cf9394155b903a3f5b8c4ebed2bf4f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4bc36a8707cf9394155b903a3f5b8c4ebed2bf4f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2067949" author="vesselina.ratcheva" created="Tue, 20 Nov 2018 16:41:01 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tess.avitabile&quot; class=&quot;user-hover&quot; rel=&quot;tess.avitabile&quot;&gt;tess.avitabile&lt;/a&gt; Yikes, sorry I overlooked that. On it.&lt;/p&gt;</comment>
                            <comment id="2067824" author="tess.avitabile" created="Tue, 20 Nov 2018 15:40:21 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=vesselina.ratcheva&quot; class=&quot;user-hover&quot; rel=&quot;vesselina.ratcheva&quot;&gt;vesselina.ratcheva&lt;/a&gt;, can you please change the startup warning to use the link that Kay specified for each branch?&lt;/p&gt;</comment>
                            <comment id="2067256" author="xgen-internal-githook" created="Mon, 19 Nov 2018 23:35:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Vesselina Ratcheva&apos;, &apos;email&apos;: &apos;vesselina.ratcheva@10gen.com&apos;, &apos;username&apos;: &apos;vessy-mongodb&apos;}
&lt;p&gt;Message: &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; Add startup warning about enableMajorityReadConcern and usage of arbiters&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 1f40ed56b27d9c98c23eb601d6b06116b194dfe7)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ac99b600745b488968257d936d8fad0f755c4f1c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ac99b600745b488968257d936d8fad0f755c4f1c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2067214" author="xgen-internal-githook" created="Mon, 19 Nov 2018 23:01:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Vesselina Ratcheva&apos;, &apos;email&apos;: &apos;vesselina.ratcheva@10gen.com&apos;, &apos;username&apos;: &apos;vessy-mongodb&apos;}
&lt;p&gt;Message: &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; Add startup warning about enableMajorityReadConcern and usage of arbiters&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 1f40ed56b27d9c98c23eb601d6b06116b194dfe7)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fd0aac9d3f762520c6159a2335c70194fb62148e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fd0aac9d3f762520c6159a2335c70194fb62148e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2053520" author="xgen-internal-githook" created="Tue, 6 Nov 2018 18:39:21 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Vesselina Ratcheva&apos;, &apos;email&apos;: &apos;vesselina.ratcheva@10gen.com&apos;, &apos;username&apos;: &apos;vessy-mongodb&apos;}
&lt;p&gt;Message: &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; Add startup warning about enableMajorityReadConcern and usage of arbiters&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1f40ed56b27d9c98c23eb601d6b06116b194dfe7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1f40ed56b27d9c98c23eb601d6b06116b194dfe7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2039000" author="tess.avitabile" created="Tue, 23 Oct 2018 14:18:24 +0000"  >&lt;p&gt;Thank you, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kay.kim&quot; class=&quot;user-hover&quot; rel=&quot;kay.kim&quot;&gt;kay.kim&lt;/a&gt;!&lt;/p&gt;

&lt;p&gt;The risk is greatest in a 3-member PSA, since you only need one data-bearing node to go down in order to lose majority writes. However, 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 &lt;tt&gt;enableMajorityReadConcern:&quot;false&quot;&lt;/tt&gt;.&lt;/p&gt;</comment>
                            <comment id="2036601" author="tess.avitabile" created="Fri, 19 Oct 2018 21:43:23 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kay.kim&quot; class=&quot;user-hover&quot; rel=&quot;kay.kim&quot;&gt;kay.kim&lt;/a&gt;, what documentation link should we use for each branch (master, 4.0, and 3.6)?&lt;/p&gt;</comment>
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            <issuekey id="881902">SERVER-42573</issuekey>
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