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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-45254] Update architecture guide for streamable isMaster</title>
                <link>https://jira.mongodb.org/browse/SERVER-45254</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="1061588">SERVER-45254</key>
            <summary>Update architecture guide for streamable isMaster</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="tess.avitabile@mongodb.com">Tess Avitabile</assignee>
                                    <reporter username="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
                    </labels>
                <created>Thu, 19 Dec 2019 16:43:09 +0000</created>
                <updated>Sun, 29 Oct 2023 22:13:51 +0000</updated>
                            <resolved>Thu, 30 Jan 2020 15:06:17 +0000</resolved>
                                                    <fixVersion>4.3.4</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2772786" author="xgen-internal-githook" created="Thu, 30 Jan 2020 15:05:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Tess Avitabile&apos;, &apos;username&apos;: &apos;tessavitabile&apos;, &apos;email&apos;: &apos;tess.avitabile@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45254&quot; title=&quot;Update architecture guide for streamable isMaster&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45254&quot;&gt;&lt;del&gt;SERVER-45254&lt;/del&gt;&lt;/a&gt; Update architecture guide for streamable isMaster&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6375ee8006c6f8a025b29036be586e03d34e4fe2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6375ee8006c6f8a025b29036be586e03d34e4fe2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2651949" author="tess.avitabile" created="Thu, 19 Dec 2019 18:00:19 +0000"  >&lt;p&gt;Thanks for the input! I&apos;ll mark this as required.&lt;/p&gt;</comment>
                            <comment id="2650695" author="pavithra.vetriselvan" created="Thu, 19 Dec 2019 17:09:16 +0000"  >&lt;p&gt;I think &lt;tt&gt;SDAM&lt;/tt&gt; might be out of scope for the architecture guide. I imagine if we were to add something about the &lt;tt&gt;TopologyVersion&lt;/tt&gt;, it would be in the &quot;Replication and Topology Coordinators&quot; section.&lt;/p&gt;

&lt;p&gt;For example (additions in &lt;b&gt;bold&lt;/b&gt;),&lt;br/&gt;
&quot;The TopologyCoordinator is in charge of maintaining state about the topology of the cluster. &lt;b&gt;On significant topology changes (state changes, reconfig, etc), the TopologyCoordinator updates its TopologyVersion. The isMaster&amp;lt;link to documentation?&amp;gt; command awaits changes in the TopologyVersion before returning.&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;It is non-blocking and does a large amount of a node&apos;s decision making surrounding replication. Most replication command requests and responses are filled in here.&quot;&lt;/p&gt;

&lt;p&gt;Note, I left &lt;tt&gt;featureCompatibilityVersion&lt;/tt&gt; changes out of this explanation because it also is not covered in the guide yet. &lt;/p&gt;</comment>
                            <comment id="2650621" author="samy.lanka" created="Thu, 19 Dec 2019 17:00:33 +0000"  >&lt;p&gt;I think the changes around &lt;tt&gt;ToplogyVersion&lt;/tt&gt; would be helpful to have in the architecture guide and would fit the level of detail that we already have. &lt;/p&gt;</comment>
                            <comment id="2650570" author="tess.avitabile" created="Thu, 19 Dec 2019 16:47:58 +0000"  >&lt;p&gt;I&apos;m unsure whether to close this ticket. The architecture guide does not currently cover &lt;tt&gt;isMaster&lt;/tt&gt; or &lt;tt&gt;SDAM&lt;/tt&gt;. However, this project does change the &lt;tt&gt;TopologyCoordinator&lt;/tt&gt;&#160;to store a &lt;tt&gt;TopologyVersion&lt;/tt&gt;. The &lt;tt&gt;TopologyVersion&lt;/tt&gt; is updated on significant topology changes, e.g. state change, reconfig, &lt;tt&gt;featureCompatibilityVersion&lt;/tt&gt;&#160;change. The &lt;tt&gt;TopologyVersion&lt;/tt&gt; is used by &lt;tt&gt;isMaster&lt;/tt&gt; commands to await a significant topology change before returning. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=pavithra.vetriselvan&quot; class=&quot;user-hover&quot; rel=&quot;pavithra.vetriselvan&quot;&gt;pavithra.vetriselvan&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=samy.lanka%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;samy.lanka@mongodb.com&quot;&gt;samy.lanka@mongodb.com&lt;/a&gt;, does this level of detail belong in the architecture guide?&lt;/p&gt;</comment>
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