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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>[DOCS-4045] Clarify that write concern majority includes all members</title>
                <link>https://jira.mongodb.org/browse/DOCS-4045</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;In PHP-1222, a user expected that the &quot;majority&quot; write concern would only consider data-bearing nodes. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=scotthernandez&quot; class=&quot;user-hover&quot; rel=&quot;scotthernandez&quot;&gt;scotthernandez&lt;/a&gt; provided me with a helpful explanation for why it needs to count all nodes, as the goal is to avoid data loss due to roll-back. It would be helpful if we explained this with a blurb in the documentation.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://docs.mongodb.org/manual/core/write-concern/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/core/write-concern/&lt;/a&gt; talks about &quot;majority&quot; persisting data to storage nodes, but it doesn&apos;t address arbiters at all. Obviously, they don&apos;t hold data, but they are counted in determining the &quot;majority&quot;.&lt;/p&gt;

&lt;p&gt;He also clarified that &quot;majority&quot; means something else when referring to election voting (it depends more on voters and vote weights than physical nodes), but I don&apos;t think we need to clarify that with this ticket.&lt;/p&gt;</description>
                <environment></environment>
        <key id="158438">DOCS-4045</key>
            <summary>Clarify that write concern majority includes all members</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="9">Done</resolution>
                                        <assignee username="sam.kleinman">Sam Kleinman</assignee>
                                    <reporter username="jmikola@mongodb.com">Jeremy Mikola</reporter>
                        <labels>
                    </labels>
                <created>Tue, 16 Sep 2014 15:50:49 +0000</created>
                <updated>Tue, 18 Nov 2014 18:09:46 +0000</updated>
                            <resolved>Mon, 17 Nov 2014 19:41:46 +0000</resolved>
                                                    <fixVersion>v1.3.12</fixVersion>
                    <fixVersion>v1.3.14</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="767115" author="xgen-internal-githook" created="Tue, 18 Nov 2014 18:09:46 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;tychoish&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-4045&quot; title=&quot;Clarify that write concern majority includes all members&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-4045&quot;&gt;&lt;del&gt;DOCS-4045&lt;/del&gt;&lt;/a&gt;: edits to read-uncommited&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/5296b324e4fb7b6bd3fce80012d1ef8216f130ac&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/5296b324e4fb7b6bd3fce80012d1ef8216f130ac&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="762838" author="kevin.pulo@10gen.com" created="Wed, 12 Nov 2014 21:52:33 +0000"  >&lt;p&gt;This change is not correct.  w:majority does &lt;b&gt;NOT&lt;/b&gt; refer to a majority of the voting members.  w:majority means a majority of &lt;b&gt;ALL&lt;/b&gt; replica set members.  The code is very straightforward on this, it is basically just &lt;a href=&quot;https://github.com/mongodb/mongo/blob/v2.6/src/mongo/db/repl/rs_config.cpp#L336&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&quot;number of members / 2 + 1&quot;&lt;/a&gt; (except if there are more arbiters than non-arbiters).  Please update the language to make it clear that when computing w:majority, all members are counted, including arbiters, non-voting members, slave delayed members, and hidden members.&lt;/p&gt;

&lt;p&gt;Note that this behaviour is changing in 2.8 to be a majority of voting members, see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14403&quot; title=&quot;Change w:majority write concern to indicate a majority of voting nodes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14403&quot;&gt;&lt;del&gt;SERVER-14403&lt;/del&gt;&lt;/a&gt;, which is the better behaviour on many levels.  But the docs for 2.6 and earlier must still be fixed.&lt;/p&gt;</comment>
                            <comment id="733852" author="xgen-internal-githook" created="Fri, 3 Oct 2014 18:59:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;tychoish&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-4045&quot; title=&quot;Clarify that write concern majority includes all members&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-4045&quot;&gt;&lt;del&gt;DOCS-4045&lt;/del&gt;&lt;/a&gt;: write concern includes arbiters and is based on votes&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/eef5ff45eb1c58646f995439714fc9f6dd9d874a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/eef5ff45eb1c58646f995439714fc9f6dd9d874a&lt;/a&gt;&lt;/p&gt;</comment>
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