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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-37065] Report ismaster:false in isMaster command response immediately upon learning of a new term</title>
                <link>https://jira.mongodb.org/browse/SERVER-37065</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently when a primary hears of a new term, it schedules work to take the global X lock and step down.  Actually preventing new writes from being accepted requires changing the value of ReplicationCoordinatorImpl::_canAcceptNonLocalWrites, which requires the global X lock, so there&apos;s no way to stop accepting new writes any faster than we do currently.  Filling out the response to an isMaster command, however, only requires the repl coord mutex, so we could be reporting ismaster:false as soon as we hear about a new term since at that point we know that we definitely are going to step down.  This could stop new writes from being routed to us that are doomed to fail once the stepdown completes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="602177">SERVER-37065</key>
            <summary>Report ismaster:false in isMaster command response immediately upon learning of a new term</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="jesse@mongodb.com">A. Jesse Jiryu Davis</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Mon, 10 Sep 2018 17:34:50 +0000</created>
                <updated>Sun, 29 Oct 2023 22:28:19 +0000</updated>
                            <resolved>Tue, 11 Dec 2018 22:20:26 +0000</resolved>
                                                    <fixVersion>3.6.13</fixVersion>
                    <fixVersion>4.1.7</fixVersion>
                    <fixVersion>4.0.11</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="2266509" author="xgen-internal-githook" created="Fri, 31 May 2019 13:39:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;A. Jesse Jiryu Davis&apos;, &apos;email&apos;: &apos;jesse@mongodb.com&apos;, &apos;username&apos;: &apos;ajdavis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37065&quot; title=&quot;Report ismaster:false in isMaster command response immediately upon learning of a new term&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37065&quot;&gt;&lt;del&gt;SERVER-37065&lt;/del&gt;&lt;/a&gt; Report ismaster:false on learning of new term&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 89a64bec9cfe221200b1a47615e8a2bf6018f874)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c3009e2df624ad215697f86e6873f7bff4302e5b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c3009e2df624ad215697f86e6873f7bff4302e5b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2266045" author="xgen-internal-githook" created="Thu, 30 May 2019 21:04:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;A. Jesse Jiryu Davis&apos;, &apos;email&apos;: &apos;jesse@mongodb.com&apos;, &apos;username&apos;: &apos;ajdavis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37065&quot; title=&quot;Report ismaster:false in isMaster command response immediately upon learning of a new term&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37065&quot;&gt;&lt;del&gt;SERVER-37065&lt;/del&gt;&lt;/a&gt; Report ismaster:false on learning of new term&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 89a64bec9cfe221200b1a47615e8a2bf6018f874)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/134e5a7120efba871c62e0f3cf511842ab859e3e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/134e5a7120efba871c62e0f3cf511842ab859e3e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2087912" author="xgen-internal-githook" created="Wed, 12 Dec 2018 00:37:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Siyuan Zhou&apos;, &apos;email&apos;: &apos;siyuan.zhou@mongodb.com&apos;, &apos;username&apos;: &apos;visualzhou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37065&quot; title=&quot;Report ismaster:false in isMaster command response immediately upon learning of a new term&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37065&quot;&gt;&lt;del&gt;SERVER-37065&lt;/del&gt;&lt;/a&gt; Fix unit tests.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f4ed4e70a12f3f4960ab418dc3df585d8044b16f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f4ed4e70a12f3f4960ab418dc3df585d8044b16f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2087733" author="xgen-internal-githook" created="Tue, 11 Dec 2018 22:19:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;A. Jesse Jiryu Davis&apos;, &apos;email&apos;: &apos;jesse@mongodb.com&apos;, &apos;username&apos;: &apos;ajdavis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37065&quot; title=&quot;Report ismaster:false in isMaster command response immediately upon learning of a new term&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37065&quot;&gt;&lt;del&gt;SERVER-37065&lt;/del&gt;&lt;/a&gt; Report ismaster:false on learning of new term&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/89a64bec9cfe221200b1a47615e8a2bf6018f874&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/89a64bec9cfe221200b1a47615e8a2bf6018f874&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1998273" author="spencer" created="Mon, 10 Sep 2018 17:37:03 +0000"  >&lt;p&gt;Changing this would mean that if an old primary participated in the election of a new primary, it would be guaranteed to report ismaster:false as soon as it voted for the new primary.&lt;/p&gt;</comment>
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            <issuekey id="654862">SERVER-38659</issuekey>
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