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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-28743] Make all WT cursor uses of keys --groupCollections aware.</title>
                <link>https://jira.mongodb.org/browse/SERVER-28743</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When WT is running in &lt;tt&gt;&amp;#45;&amp;#45;groupCollections&lt;/tt&gt; mode all collections (but not indexes) with a prefix that are creating a WT table must change the configuration input &lt;tt&gt;key_format=q&lt;/tt&gt; to &lt;tt&gt;key_format=qq&lt;/tt&gt;. This changes the &quot;key&quot; value from being an int64 to instead be two adjacent int64. The key format for indexes should be changed from &quot;u&quot; to &quot;qu&quot;.&lt;/p&gt;

&lt;p&gt;When performing WT_CURSOR::set_key, the key value must be modified when its collection/index is sharing a WT table with other collection/indexes.&lt;/p&gt;

&lt;p&gt;Furthermore, all calls to WT_CURSOR::next/prev that do not return a WT_NOTFOUND must also extract the key and compare the prefix found with that of the collection/index it represents.&lt;/p&gt;

&lt;p&gt;It may be desirable to add a &quot;&lt;span class=&quot;error&quot;&gt;&amp;#91;reading&amp;#93;&lt;/span&gt; cursor&quot; abstraction that sits between the &lt;tt&gt;WiredTiger&lt;span class=&quot;error&quot;&gt;&amp;#91;RecordStore|Index&amp;#93;&lt;/span&gt;::Cursor&lt;/tt&gt; and their current raw usage of WT_CURSOR. This abstraction would encapsulate the logic of transforming a cursor that iterates into an adjacent collection/index into a logical EOF.&lt;/p&gt;

&lt;p&gt;Collections/indexes that have no prefix should not suffer an undue performance penalty unnecessarily constructing and parsing keys.&lt;/p&gt;</description>
                <environment></environment>
        <key id="373155">SERVER-28743</key>
            <summary>Make all WT cursor uses of keys --groupCollections aware.</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="daniel.gottlieb@mongodb.com">Daniel Gottlieb</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                    </labels>
                <created>Tue, 11 Apr 2017 21:31:12 +0000</created>
                <updated>Tue, 15 Sep 2020 18:32:13 +0000</updated>
                            <resolved>Fri, 2 Jun 2017 16:20:21 +0000</resolved>
                                                    <fixVersion>3.5.9</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1586103" author="xgen-internal-githook" created="Fri, 2 Jun 2017 16:19:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dgottlieb&apos;, u&apos;name&apos;: u&apos;Daniel Gottlieb&apos;, u&apos;email&apos;: u&apos;daniel.gottlieb@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28743&quot; title=&quot;Make all WT cursor uses of keys --groupCollections aware.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28743&quot;&gt;&lt;del&gt;SERVER-28743&lt;/del&gt;&lt;/a&gt;: Have WiredTiger data structures be --groupCollections aware.&lt;/p&gt;

&lt;p&gt;WiredTigerRecordStores and WiredTigerIndexes instantiated with a KVPrefix&lt;br/&gt;
will now transparently persist and query for data with the associated&lt;br/&gt;
prefix. A prefix is represented as a 64-bit integer and is concatenated&lt;br/&gt;
onto each key inserted into each grouped RecordStore/Index.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b102f090bd7ce83502984fcb70b4748be5bdb2b8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b102f090bd7ce83502984fcb70b4748be5bdb2b8&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="382017">SERVER-29113</issuekey>
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            <issuelink>
            <issuekey id="386999">WT-3341</issuekey>
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