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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-81829] RecoveryUnit SnapshotIDs do not need to increment atomic for each snapshot</title>
                <link>https://jira.mongodb.org/browse/SERVER-81829</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We use the RecoveryUnit &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f6d8fadde7595051f97585ad4ef9e885d1385ce1/src/mongo/db/storage/recovery_unit.cpp#L58&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;snapshot ID&lt;/a&gt; for comparison purposes to tell us two things:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Has my snapshot changed on the same RecoveryUnit? (e..g normal yielding)&lt;/li&gt;
	&lt;li&gt;Has my snapshot changed from a different RecoveryUnit? (e.g. with getMore)&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;We need to maintain that snapshot IDs are globally unique, but instead of incrementing the atomic for every snapshot, we can just have a globally unique RecoveryUnit ID and a locally unique snapshot counter for each RecoveryUnit. This should be sufficient to reduce contention on the Snapshot ID atomic and still maintains uniqueness.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2458069">SERVER-81829</key>
            <summary>RecoveryUnit SnapshotIDs do not need to increment atomic for each snapshot</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Tue, 3 Oct 2023 20:57:52 +0000</created>
                <updated>Mon, 13 Nov 2023 20:58:54 +0000</updated>
                            <resolved>Mon, 13 Nov 2023 20:58:54 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5876999" author="louis.williams" created="Mon, 13 Nov 2023 20:58:54 +0000"  >&lt;p&gt;Closing this as &quot;Won&apos;t do&quot;. The performance benefit is negligible. The proposed change increases the risk of SnapshotID collision, which requires a 32-bit int to roll-over, previously a 64-bit int. Historically, this has led to server crashes, so it&apos;s a bit risky considering the marginal improvements.&lt;/p&gt;</comment>
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