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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-56787] Move the uuid and empty fields of create sharded collection logging to the end event</title>
                <link>https://jira.mongodb.org/browse/SERVER-56787</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When creating a sharded collection there are two events being reported:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;shardCollection.start with the shardKey, uuid, a flag to check if the collection is empty and the shardId&lt;/li&gt;
	&lt;li&gt;shardCollection.end with two parameters: number of chunks created and the collection version&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The uuid and the empty flag can only be determined after the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3b92cf185c76280a82ea62b367cefb7aca347448/src/mongo/db/s/create_collection_coordinator.cpp#L457&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;_createCollectionAndIndexes step&lt;/a&gt; is executed, because we can check if the collection is empty after taking the critical section, and if there was no collection, that&apos;s the point where the uuid is created. If we move both parameters to the shardCollection.end event, then we can move the logging to the beginning kCommit phase (or maybe even to the kCheck phase). However, right now we don&apos;t know if this logging is being used, so, before doing the change we should do a quick check who&apos;s possibly using it.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1708323">SERVER-56787</key>
            <summary>Move the uuid and empty fields of create sharded collection logging to the end event</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="13201">Fixed</resolution>
                                        <assignee username="marcos.grillo@mongodb.com">Marcos Jos&#233; Grillo Ramirez</assignee>
                                    <reporter username="marcos.grillo@mongodb.com">Marcos Jos&#233; Grillo Ramirez</reporter>
                        <labels>
                            <label>PM-1965-Cleanup</label>
                    </labels>
                <created>Mon, 10 May 2021 11:39:29 +0000</created>
                <updated>Sun, 29 Oct 2023 21:53:50 +0000</updated>
                            <resolved>Thu, 13 May 2021 14:49:48 +0000</resolved>
                                                    <fixVersion>5.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="3771646" author="marcos.grillo" created="Thu, 13 May 2021 14:49:48 +0000"  >&lt;p&gt;Previously in the presence of stepdowns there were no guarantees regarding &lt;em&gt;shardCollection.start&lt;/em&gt; or &lt;em&gt;shardCollection.end&lt;/em&gt;. Now the guarantee is the following:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;There will be at least one pair of (&lt;em&gt;shardCollection.start&lt;/em&gt;, &lt;em&gt;shardCollection.end&lt;/em&gt;) events after a successful shardCollection execution.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Additionally:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;The &lt;em&gt;uuid&lt;/em&gt; and the &lt;em&gt;collectionIsEmpty&lt;/em&gt; flags are being moved from the start to the end event.&lt;/li&gt;
	&lt;li&gt;The &lt;em&gt;collectionIsEmpty&lt;/em&gt; and &lt;em&gt;numChunks&lt;/em&gt; are now optional, they&apos;ll be reported only when the event comes from a primary that haven&apos;t stepped down during the command execution.&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="3771554" author="xgen-internal-githook" created="Thu, 13 May 2021 14:21:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Marcos Jos&#233; Grillo Ramirez&apos;, &apos;email&apos;: &apos;marcos.grillo@mongodb.com&apos;, &apos;username&apos;: &apos;m4nti5&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56787&quot; title=&quot;Move the uuid and empty fields of create sharded collection logging to the end event&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56787&quot;&gt;&lt;del&gt;SERVER-56787&lt;/del&gt;&lt;/a&gt; Move the uuid and empty fields of create sharded collection logging to the end event&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d9fbcf0e3985dc751a259c2e8ca4713283b22aba&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d9fbcf0e3985dc751a259c2e8ca4713283b22aba&lt;/a&gt;&lt;/p&gt;</comment>
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