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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-9741] verify write intents are efficient for btree bucket operations.</title>
                <link>https://jira.mongodb.org/browse/SERVER-9741</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;with indexed arrays (&quot;multikeys&quot;) the number of btree buckets hit by a single update can be very high.&lt;/p&gt;

&lt;p&gt;now if a single key were added to a bucket, efficiently, that might be a very small amount of data to journal.  but if we did something akin to a memmove() then the data to journal might be quite large.  The request with this ticket is to verify that we don&apos;t do the latter; and if we do, to improve it by logging a &quot;memmove&quot; op instead of a significant % of the total data in the btree bucket.  perhaps that doesn&apos;t work, the memmove op, given group commits, but the concept of auditing this is sound, and then we figure it out from there.  perhaps it is already efficient, not sure.&lt;/p&gt;

&lt;p&gt;subitem: check the &quot;merge&quot; code with regards to the above.  merging likely requires significant journaling.  if we are near a commitIfNeeded limited we might simply skip a few merges and do them later?&lt;/p&gt;</description>
                <environment></environment>
        <key id="76113">SERVER-9741</key>
            <summary>verify write intents are efficient for btree bucket operations.</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>Tue, 21 May 2013 20:07:41 +0000</created>
                <updated>Tue, 6 Dec 2022 05:20:45 +0000</updated>
                            <resolved>Fri, 14 Sep 2018 20:09:10 +0000</resolved>
                                    <version>2.4.3</version>
                                                    <component>Index Maintenance</component>
                    <component>MMAPv1</component>
                                        <votes>3</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1109053" author="dwight_10gen" created="Wed, 9 Dec 2015 03:51:58 +0000"  >&lt;p&gt;the comment/request is valid and has been considered, but not implemented afaik, in mmap.&lt;/p&gt;

&lt;p&gt;i do not know precisely what WildTiger does for this.  Perhaps someone can chime in on that.  It may be efficient for that already.&lt;/p&gt;

&lt;p&gt;Given that WT is default in v3.2, I suspect the priority would be that these are efficient in WT, before upgrading mmap.&lt;/p&gt;
</comment>
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