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    <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-79162] Improve/clarify API for accessing ReplicationCoordinator</title>
                <link>https://jira.mongodb.org/browse/SERVER-79162</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We provide the following methods for accessing the &lt;tt&gt;ReplicationCoordinator&lt;/tt&gt;:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;static ReplicationCoordinator* get(ServiceContext*service);&lt;/li&gt;
	&lt;li&gt;static ReplicationCoordinator* get(ServiceContext&amp;amp;service);&lt;/li&gt;
	&lt;li&gt;static ReplicationCoordinator* get(OperationContext*ctx);&lt;/li&gt;
&lt;/ul&gt;



&lt;p&gt; Callers of these methods are inconsistent as to whether they check if the return value is null. The vast majority&#160;do not check.&#160;&lt;/p&gt;

&lt;p&gt;In practice it seems fine to not check:&#160;&lt;tt&gt;mongod_main&lt;/tt&gt; always registers a coordinator early on before calling &lt;tt&gt;initAndListen&lt;/tt&gt;, as does &lt;tt&gt;cryptd_main&lt;/tt&gt;, and so it seems the only place a coordinator might not be running currently is in some unit tests (where a mock coordinator can be registered - we already have a mock coordinator type for this).&lt;/p&gt;

&lt;p&gt;We should consider improving the APIs we provide for accessing the coordinator. Returning a reference, rather than a pointer, might more clearly communicate to callers that they do not need to check for null. &#160;If there &lt;em&gt;are&lt;/em&gt; any valid use cases to access the coordinator when it may be null (e.g. code that may run before the coordinator exists during startup) we could have a separate API method for that which returns an optional or a pointer, and document what its valid use cases are, pushing users toward the other method whenever possible.&lt;/p&gt;

&lt;p&gt;At a minimum, if we don&apos;t want to change the API, it would be good to document when callers can/can&apos;t assume it returns a value, possibly introduce invariant(s) reinforcing that assumption, and clean up any unnecessary null checks. &#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2397231">SERVER-79162</key>
            <summary>Improve/clarify API for accessing ReplicationCoordinator</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="kaitlin.mahar@mongodb.com">Kaitlin Mahar</reporter>
                        <labels>
                            <label>former-quick-wins</label>
                    </labels>
                <created>Thu, 20 Jul 2023 17:49:46 +0000</created>
                <updated>Mon, 24 Jul 2023 18:08:26 +0000</updated>
                                                                                                <votes>0</votes>
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