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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-14403] Change w:majority write concern to indicate a majority of voting nodes</title>
                <link>https://jira.mongodb.org/browse/SERVER-14403</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In systems with non-voting nodes, confirmed w:majority writes might in some circumstances still roll back.  This is because rollback is precluded by ensuring that a majority of &lt;b&gt;voting&lt;/b&gt; nodes are aware of the write, but w:majority in a system with a high ratio of non-voting to voting nodes might not ensure this.&lt;/p&gt;

&lt;p&gt;Conversely, on clusters with a high non-voting to voting ratio, w:majority is really too strong a requirement for committedness.  Only the majority of the voting nodes need to respond, to be safe from rollback.&lt;/p&gt;

&lt;p&gt;The work of this ticket is to change the meaning of &quot;w:majority&quot; to indicate acceptance of a write from the majority of voting nodes.  No built-in write concern will provide the old functionality.&lt;/p&gt;</description>
                <environment></environment>
        <key id="144839">SERVER-14403</key>
            <summary>Change w:majority write concern to indicate a majority of voting nodes</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="9">Done</resolution>
                                        <assignee username="matt.dannenberg">Matt Dannenberg</assignee>
                                    <reporter username="schwerin@mongodb.com">Andy Schwerin</reporter>
                        <labels>
                    </labels>
                <created>Tue, 1 Jul 2014 15:56:31 +0000</created>
                <updated>Mon, 11 Jul 2016 17:17:40 +0000</updated>
                            <resolved>Tue, 21 Oct 2014 22:27:01 +0000</resolved>
                                                    <fixVersion>2.7.8</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="775327" author="schwerin" created="Mon, 1 Dec 2014 18:44:40 +0000"  >&lt;p&gt;To satisfy a &quot;majority&quot; write concern in a typical cluster configuration, a write must propagate to more than half of the voting nodes.  Since writes propagate to data-bearing nodes, but never propagate to arbiters, there is an exception to this rule.  If the number of voting nodes that are data bearing is not more than half of the total number of voting nodes, then &quot;majority&quot; write concern is satisfied when a write propagates to all data-bearing, voting nodes.  It should be noted that this exception is &lt;em&gt;only&lt;/em&gt; safe if the number of arbiters is at most half of the total number of voting nodes, or if all non-voting nodes are also unelectable.  This is among the several reasons why systems with more than 1 arbiter are strongly discouraged.&lt;/p&gt;

&lt;p&gt;If &lt;em&gt;v&lt;/em&gt; is the number of voting nodes, and &lt;em&gt;a&lt;/em&gt; is the number of voting nodes that are arbiters, this is summarized as follows:&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;majority = min(floor(&lt;em&gt;v&lt;/em&gt;/2) + 1, &lt;em&gt;v&lt;/em&gt; - &lt;em&gt;a&lt;/em&gt;)&lt;/p&gt;&lt;/blockquote&gt;</comment>
                            <comment id="745198" author="xgen-internal-githook" created="Mon, 20 Oct 2014 14:36:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;milkie&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;}
&lt;p&gt;Message: &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; translate w:&apos;majority&apos; to be internal tag pattern &apos;$majority&apos;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5f6b886405ed19ed5c779709c7f1581c1ed3eaed&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5f6b886405ed19ed5c779709c7f1581c1ed3eaed&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="155164">SERVER-15060</issuekey>
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            <issuekey id="118187">SERVER-13070</issuekey>
        </issuelink>
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                                        <issuelink>
            <issuekey id="143027">SERVER-14308</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="171827">SERVER-16357</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="175376">SERVER-16597</issuekey>
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            <issuekey id="164842">SERVER-15764</issuekey>
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