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    <title>MongoDB Jira</title>
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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-15273] Only allocate powerOfTwo sized records in regular collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-15273</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Going forward, MMAPv1 will only allocate powerOfTwo sized records, regardless of the flag. This is required to make the new freelist work correctly in O(1) time without any scanning.&lt;/p&gt;

&lt;p&gt;This only applies to regular collections. In particular it will not apply to capped collections or indexes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="158526">SERVER-15273</key>
            <summary>Only allocate powerOfTwo sized records in regular collections</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="9">Done</resolution>
                                        <assignee username="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                    </labels>
                <created>Tue, 16 Sep 2014 21:17:34 +0000</created>
                <updated>Thu, 2 Aug 2018 21:25:05 +0000</updated>
                            <resolved>Sat, 18 Oct 2014 00:45:58 +0000</resolved>
                                                    <fixVersion>2.7.8</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="744691" author="redbeard0531" created="Sat, 18 Oct 2014 00:50:44 +0000"  >&lt;p&gt;Users that were explicitly turning off powerOf2 will need to switch to the stronger noPadding mode from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15273&quot; title=&quot;Only allocate powerOfTwo sized records in regular collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15273&quot;&gt;&lt;del&gt;SERVER-15273&lt;/del&gt;&lt;/a&gt;. This should only be done on collections that never get deletes or growing updates.&lt;/p&gt;</comment>
                            <comment id="744684" author="xgen-internal-githook" created="Sat, 18 Oct 2014 00:44:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15273&quot; title=&quot;Only allocate powerOfTwo sized records in regular collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15273&quot;&gt;&lt;del&gt;SERVER-15273&lt;/del&gt;&lt;/a&gt; Only quantize to exact bucket sizes&lt;/p&gt;

&lt;p&gt;Prep for new freelist implementation.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/08319d688517af8ac88fe7054ea10f1f08c5bf2d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/08319d688517af8ac88fe7054ea10f1f08c5bf2d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="721354" author="redbeard0531" created="Wed, 17 Sep 2014 21:35:24 +0000"  >&lt;p&gt;The usePowerOfTwo flags will be silently ignored, and we will just use powerOfTwo allocation in all cases.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="165564">SERVER-15807</issuekey>
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            <issuelink>
            <issuekey id="168439">DOCS-4327</issuekey>
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