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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-15080] Track all relevant replica set state in topology coordinator</title>
                <link>https://jira.mongodb.org/browse/SERVER-15080</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The topology coordinator is the repository for replica set state about leadership and electability, and about topology (sync source).  It should provide clear, well documented interfaces for updating and observing that state.&lt;/p&gt;</description>
                <environment></environment>
        <key id="155388">SERVER-15080</key>
            <summary>Track all relevant replica set state in topology coordinator</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="schwerin@mongodb.com">Andy Schwerin</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                    </labels>
                <created>Thu, 28 Aug 2014 19:06:16 +0000</created>
                <updated>Thu, 2 Oct 2014 21:31:24 +0000</updated>
                            <resolved>Wed, 10 Sep 2014 13:37:25 +0000</resolved>
                                                    <fixVersion>2.7.7</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="715600" author="xgen-internal-githook" created="Wed, 10 Sep 2014 13:34:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;andy10gen&apos;, u&apos;name&apos;: u&apos;Andy Schwerin&apos;, u&apos;email&apos;: u&apos;schwerin@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15080&quot; title=&quot;Track all relevant replica set state in topology coordinator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15080&quot;&gt;&lt;del&gt;SERVER-15080&lt;/del&gt;&lt;/a&gt; Fix assert code conflict.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ee28d3ffccd790b16675c3a09644661863965a0c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ee28d3ffccd790b16675c3a09644661863965a0c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="715596" author="xgen-internal-githook" created="Wed, 10 Sep 2014 13:32:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;andy10gen&apos;, u&apos;name&apos;: u&apos;Andy Schwerin&apos;, u&apos;email&apos;: u&apos;schwerin@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15080&quot; title=&quot;Track all relevant replica set state in topology coordinator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15080&quot;&gt;&lt;del&gt;SERVER-15080&lt;/del&gt;&lt;/a&gt; Move HeartbeatResponseAction and TopologyCoordinator::Role for readability.&lt;/p&gt;

&lt;p&gt;HeartbeatResponseAction moves to its own file and becomes a top-level type,&lt;br/&gt;
because it is sometimes useful to have its definition without that of&lt;br/&gt;
TopologyCoordinator, and because it clutters the TopologyCoordinator class&lt;br/&gt;
definition.  TopologyCoordinator::Role gets defined at the end of the&lt;br/&gt;
topology_coordinator.h header, so it also does not clutter the&lt;br/&gt;
TopologyCoordinator class definition.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/adfc53c325d95826940a60891b11a2199aca4735&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/adfc53c325d95826940a60891b11a2199aca4735&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="715595" author="xgen-internal-githook" created="Wed, 10 Sep 2014 13:32:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;andy10gen&apos;, u&apos;name&apos;: u&apos;Andy Schwerin&apos;, u&apos;email&apos;: u&apos;schwerin@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15080&quot; title=&quot;Track all relevant replica set state in topology coordinator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15080&quot;&gt;&lt;del&gt;SERVER-15080&lt;/del&gt;&lt;/a&gt; Clarify state-changing behavior of TopologyCoordinator and its implementation.&lt;/p&gt;

&lt;p&gt;This patch simplifies the state stored in the TopologyCoordinatorImpl, introduces fuller documentary&lt;br/&gt;
comments to the interface, checks preconditions, deprecates several methods currently used only in&lt;br/&gt;
testing, and generally tries to make the behavior easier to follow.&lt;/p&gt;

&lt;p&gt;Methods are introduced for adjusting the maintenance mode count; to allow the applier to move&lt;br/&gt;
the node between recovering, rollback, initial sync and secondary states; to handle winning and&lt;br/&gt;
losing elections, etc.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/05df4fe1e691fcc03369ce64ac6d177d50b7778d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/05df4fe1e691fcc03369ce64ac6d177d50b7778d&lt;/a&gt;&lt;/p&gt;</comment>
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