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    <title>MongoDB Jira</title>
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    <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-16850] Remove support for touch command for RocksDB</title>
                <link>https://jira.mongodb.org/browse/SERVER-16850</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have removed support for the touch command for wiredTiger because the result of the touch command (data:&lt;/p&gt;
{numRanges:.., millis:}
&lt;p&gt;) is very mmapv1 specific. &apos;numRanges&apos; corresponds to the number of extents touched into memory for a particular collection.&lt;/p&gt;

&lt;p&gt;Since the concept of extents also doesn&apos;t exist in RocksDB, the result of the touch command doesn&apos;t really make sense. Furthermore, the current implementation of touch within RocksDB just forces all data to go through the block cache once by literally using a RocksDB iterator to read in all the data for a column family (the corresponding one for a collection). This is equivalent to doing a collection scan. &lt;/p&gt;

&lt;p&gt;I&apos;ve discussed this with Matt, Igor, and Siying.&lt;/p&gt;</description>
                <environment></environment>
        <key id="178739">SERVER-16850</key>
            <summary>Remove support for touch command for RocksDB</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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.alabi@10gen.com">Daniel Alabi</assignee>
                                    <reporter username="daniel.alabi@10gen.com">Daniel Alabi</reporter>
                        <labels>
                            <label>28qa</label>
                    </labels>
                <created>Wed, 14 Jan 2015 19:08:35 +0000</created>
                <updated>Fri, 17 May 2019 13:44:01 +0000</updated>
                            <resolved>Thu, 15 Jan 2015 15:43:20 +0000</resolved>
                                    <version>2.8.0-rc4</version>
                                    <fixVersion>3.0.0-rc6</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="805356" author="xgen-internal-githook" created="Thu, 15 Jan 2015 15:29:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;alabid&apos;, u&apos;name&apos;: u&apos;alabid&apos;, u&apos;email&apos;: u&apos;alabidan@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16850&quot; title=&quot;Remove support for touch command for RocksDB&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16850&quot;&gt;&lt;del&gt;SERVER-16850&lt;/del&gt;&lt;/a&gt; Remove support for touch command for RocksDB storage engine&lt;/p&gt;

&lt;p&gt;Closes #908&lt;/p&gt;

&lt;p&gt;Signed-off-by: Benety Goh &amp;lt;benety@mongodb.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/48453bc2cb2f8f15cd69305d7526917ecf213211&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/48453bc2cb2f8f15cd69305d7526917ecf213211&lt;/a&gt;&lt;/p&gt;</comment>
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