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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-35565] Change capped collection age-out to be based on collection storageSize, not dataSize</title>
                <link>https://jira.mongodb.org/browse/SERVER-35565</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Due to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35431&quot; title=&quot;rollback does not correct sizeStorer data sizes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35431&quot;&gt;SERVER-35431&lt;/a&gt;, the dataSize reported for a collection can be incorrect in 4.0, even without unclean crashes.  We should switch capped collection sizes to be based on the storageSize, not the dataSize, so that the calculations can be accurate.  We also believe this is more likely to be what users actually want when they configure a capped collection anyway, as they are generally trying to limit the disk space consumed by the collection.&lt;/p&gt;</description>
                <environment></environment>
        <key id="558201">SERVER-35565</key>
            <summary>Change capped collection age-out to be based on collection storageSize, not dataSize</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="13202">Works as Designed</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Tue, 12 Jun 2018 20:09:15 +0000</created>
                <updated>Fri, 27 Oct 2023 13:53:44 +0000</updated>
                            <resolved>Fri, 15 Jun 2018 14:23:03 +0000</resolved>
                                                                    <component>Replication</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1919561" author="bruce.lucas@10gen.com" created="Wed, 13 Jun 2018 15:16:45 +0000"  >&lt;p&gt;This would be a very significant behavior change for users that could result in substantially larger disk utilization if there is significant compression. If we do go this route seems like it should be opt-in, e.g. maybe set using a different parameter.&lt;/p&gt;</comment>
                            <comment id="1919343" author="michael.cahill" created="Wed, 13 Jun 2018 12:18:42 +0000"  >&lt;p&gt;There will be unexpected consequences if storageSize is used instead of dataSize to truncate collections.  In particular, for busy collections the storageSize can vary by up to 50% during checkpoints, so the behavior will be very uneven.  It would be relatively easy to create workloads where all inserted data is deleted immediately until a checkpoint runs and reduces the storageSize, allowing more documents to be inserted.&lt;/p&gt;

&lt;p&gt;Even if we address that somehow by using some hybrid of storageSize, truncated size and an estimate of the compression ratio, this doesn&apos;t seem like a behavior that would be reasonable to change in a patch release.&lt;/p&gt;</comment>
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