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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-57153] Support co-existing donors/recipients in resharding metrics</title>
                <link>https://jira.mongodb.org/browse/SERVER-57153</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;h3&gt;&lt;a name=&quot;Background&quot;&gt;&lt;/a&gt;Background&lt;/h3&gt;

&lt;p&gt;The metrics class expects only one resharding operation node type to be active at once for a particular process. This is a problem on processes that have both donors and recipients. It causes issues with both double-starting and the &#8220;quicker&#8221; node type ending the operation before the &#8220;slower&#8221; node type is finished.&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;ProposedSolution&quot;&gt;&lt;/a&gt;Proposed Solution&lt;/h3&gt;
&lt;ol&gt;
	&lt;li&gt;Change the participant state enums to be boost::optionals&lt;/li&gt;
	&lt;li&gt;onStart will emplace a state enum with kUnused***&lt;/li&gt;
	&lt;li&gt;onStart will check for an emplaced donor/recipient and allow no-op if the other type is already emplaced. If any other combination of enum types is placed down, it will trip an invariant.&lt;/li&gt;
	&lt;li&gt;onCompletion/onStepDown will only remove the enum for that particular node type, letting the last node type to quit truly shut down the metrics system.&lt;/li&gt;
	&lt;li&gt;onCompletion/onStepDown will only take its expected actions if it is the last node type existing on that process for the resharding operation.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;***You&#8217;d think that we can just increment the state past kUnused to indicate that a donor/recipient is active on the process, but the way metrics are written, the state can&#8217;t be incremented until it&#8217;s been persisted on disk. The metrics system is started before any state changes are persisted on disk, so making the state enums optional is our way of satisfying the state transition ordering.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1753892">SERVER-57153</key>
            <summary>Support co-existing donors/recipients in resharding metrics</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="blake.oler@mongodb.com">Blake Oler</assignee>
                                    <reporter username="blake.oler@mongodb.com">Blake Oler</reporter>
                        <labels>
                            <label>PM-234-M3</label>
                            <label>PM-234-T-autocommits</label>
                            <label>post-rc0</label>
                    </labels>
                <created>Mon, 24 May 2021 14:53:05 +0000</created>
                <updated>Sun, 29 Oct 2023 21:53:10 +0000</updated>
                            <resolved>Thu, 3 Jun 2021 20:46:50 +0000</resolved>
                                                    <fixVersion>5.0.0-rc1</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4108214" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 19:00:22 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3858528" author="xgen-internal-githook" created="Thu, 3 Jun 2021 20:25:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Blake Oler&apos;, &apos;email&apos;: &apos;blake.oler@mongodb.com&apos;, &apos;username&apos;: &apos;BlakeIsBlake&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57153&quot; title=&quot;Support co-existing donors/recipients in resharding metrics&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57153&quot;&gt;&lt;del&gt;SERVER-57153&lt;/del&gt;&lt;/a&gt; Support co-existing donors/recipients in resharding metrics&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 83fea20e50872158c620b0eef720a77a173f176a)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/66bf2823f5e8149147c05c7e4bbc29c1eab3692c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/66bf2823f5e8149147c05c7e4bbc29c1eab3692c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3852483" author="xgen-internal-githook" created="Tue, 1 Jun 2021 21:11:32 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Blake Oler&apos;, &apos;email&apos;: &apos;blake.oler@mongodb.com&apos;, &apos;username&apos;: &apos;BlakeIsBlake&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57153&quot; title=&quot;Support co-existing donors/recipients in resharding metrics&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57153&quot;&gt;&lt;del&gt;SERVER-57153&lt;/del&gt;&lt;/a&gt; Support co-existing donors/recipients in resharding metrics&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/83fea20e50872158c620b0eef720a77a173f176a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/83fea20e50872158c620b0eef720a77a173f176a&lt;/a&gt;&lt;/p&gt;</comment>
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