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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-13473] journaling too much on key deletions</title>
                <link>https://jira.mongodb.org/browse/SERVER-13473</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;it appears that it&apos;s common for the whole btree bucket to get journaled.  that&apos;s suboptimal.&lt;/p&gt;</description>
                <environment></environment>
        <key id="129251">SERVER-13473</key>
            <summary>journaling too much on key deletions</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="dwight@mongodb.com">Dwight Merriman</reporter>
                        <labels>
                    </labels>
                <created>Thu, 3 Apr 2014 16:51:08 +0000</created>
                <updated>Tue, 6 Dec 2022 05:08:18 +0000</updated>
                            <resolved>Fri, 14 Sep 2018 19:59:40 +0000</resolved>
                                    <version>2.6.0-rc3</version>
                                                    <component>Index Maintenance</component>
                    <component>MMAPv1</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="534828" author="dwight_10gen" created="Thu, 3 Apr 2014 21:27:08 +0000"  >&lt;p&gt;so &amp;#8211; yes.  btreemod() declares written the full bucket.  we can make delKeyAtPos smarter for the common case, and have it do the whole bucket for rare situations.&lt;/p&gt;

&lt;p&gt;bool BtreeBucket&amp;lt;V&amp;gt;::unindex(IndexCatalogEntry* btreeState,&lt;br/&gt;
                                 const DiskLoc thisLoc,&lt;br/&gt;
                                 const BSONObj&amp;amp; key,&lt;br/&gt;
                                 const DiskLoc recordLoc) const {&lt;br/&gt;
        int pos;&lt;br/&gt;
        bool found;&lt;br/&gt;
        DiskLoc loc = locate(btreeState, thisLoc, key, pos, found, recordLoc, 1);&lt;br/&gt;
        if ( found ) &lt;/p&gt;
{
            loc.btreemod&amp;lt;V&amp;gt;()-&amp;gt;delKeyAtPos(btreeState, loc, pos);
            return true;
        }
&lt;p&gt;        return false;&lt;br/&gt;
    }&lt;br/&gt;
}}&lt;/p&gt;
</comment>
                            <comment id="534811" author="dwight_10gen" created="Thu, 3 Apr 2014 21:18:08 +0000"  >&lt;p&gt;i&apos;m just starting to check...will let u know&lt;/p&gt;</comment>
                            <comment id="534434" author="milkie" created="Thu, 3 Apr 2014 17:41:32 +0000"  >&lt;p&gt;Interesting. Is this due to overly aggressive write intent range declaring, or something else more subtle?&lt;/p&gt;</comment>
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