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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-25232] QueryableBackupMode + WT causes a full database scan</title>
                <link>https://jira.mongodb.org/browse/SERVER-25232</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;QueryableBackupMode will cause the `_sizeStorer` member to not be instantiated: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp#L269&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp#L269&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;When the `_sizeStorer` does not exist, the WiredTigerRecordStore ctor table scans to count up how many documents exist: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/storage/wiredtiger/wiredtiger_record_store.cpp#L855&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/db/storage/wiredtiger/wiredtiger_record_store.cpp#L855&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This is not ideal. It seems that the size storer should be able to read data off disk while in QueryableBackupMode to initialize its state, while also avoiding any writes to disk as data should not be changing.&lt;/p&gt;</description>
                <environment></environment>
        <key id="303409">SERVER-25232</key>
            <summary>QueryableBackupMode + WT causes a full database scan</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="9">Done</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                    </labels>
                <created>Fri, 22 Jul 2016 20:24:31 +0000</created>
                <updated>Tue, 6 Dec 2022 04:20:33 +0000</updated>
                            <resolved>Thu, 4 Aug 2016 20:15:09 +0000</resolved>
                                                    <fixVersion>3.3.11</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1347661" author="xgen-internal-githook" created="Thu, 4 Aug 2016 20:14:23 +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-25232&quot; title=&quot;QueryableBackupMode + WT causes a full database scan&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25232&quot;&gt;&lt;del&gt;SERVER-25232&lt;/del&gt;&lt;/a&gt;: Avoid table scans on startup with queryableBackupMode WT&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b8c9312f13de0d05232bfb68966f5da4ce27328d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b8c9312f13de0d05232bfb68966f5da4ce27328d&lt;/a&gt;&lt;/p&gt;</comment>
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