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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-31741] WriteConcern - &apos;majority&apos; should not count aribiters</title>
                <link>https://jira.mongodb.org/browse/SERVER-31741</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I have a 5 node replica set with 3 data nodes and 2 arbiters.&lt;/p&gt;

&lt;p&gt;Writes are configured with a writeconcern=&apos;Majority&apos;.&lt;/p&gt;

&lt;p&gt;So the expected number of writers is 3. So if any one data node is node the writes don&apos;t work.  Shouldn&apos;t  &apos;WriteConcern&apos; look at the type of the node and decide? So it should consider the &apos;Majority&apos; of nodes that can actually accept writes.&lt;/p&gt;

&lt;p&gt;E.g. If 1 data down is down that leaves 2 data nodes + 2 arbiters.  We should still be able to write with &apos;Majority&apos; writeConcern.&lt;/p&gt;</description>
                <environment></environment>
        <key id="451723">SERVER-31741</key>
            <summary>WriteConcern - &apos;majority&apos; should not count aribiters</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="13202">Works as Designed</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="dharshanr@scalegrid.net">Dharshan Rangegowda</reporter>
                        <labels>
                    </labels>
                <created>Thu, 26 Oct 2017 22:35:36 +0000</created>
                <updated>Fri, 27 Oct 2023 13:54:08 +0000</updated>
                            <resolved>Thu, 26 Oct 2017 23:49:13 +0000</resolved>
                                                                    <component>Write Ops</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1974496" author="brucezu" created="Mon, 13 Aug 2018 19:04:29 +0000"  >&lt;p&gt;Hi Andy,&lt;/p&gt;

&lt;p&gt;As arbiter only votes and does not keep data, May I know why still take the arbiter in calculating majority? what will happen if we do not&#160;count arbiters?&#160;would not it make the replset&#160;described by Dharshan&#160;more robust?&#160;&lt;/p&gt;

&lt;p&gt;Thank you&lt;/p&gt;

&lt;p&gt;Bruce&lt;/p&gt;</comment>
                            <comment id="1710725" author="schwerin" created="Thu, 26 Oct 2017 23:48:55 +0000"  >&lt;p&gt;It is not safe for a node to locally change the definition of majority based on its belief about what nodes are up. It is also a requirement of the consensus protocol that writes be confirmed by a majority of voting nodes to ensure they do not roll back. Since arbiters vote but do not receive writes, this behavior is as designed.&lt;/p&gt;</comment>
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