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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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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-17255] Don&apos;t lock MODE_X for compact() operation</title>
                <link>https://jira.mongodb.org/browse/SERVER-17255</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Both RocksDB and WiredTiger (I think) can execute compact() operation concurrently with read and write requests. However, mongo currently locks an entire database with MODE_X when it compacts: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/commands/compact.cpp#L146&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/commands/compact.cpp#L146&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Would it make sense to remove this?&lt;/p&gt;</description>
                <environment></environment>
        <key id="183662">SERVER-17255</key>
            <summary>Don&apos;t lock MODE_X for compact() operation</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="igor">Igor Canadi</reporter>
                        <labels>
                    </labels>
                <created>Wed, 11 Feb 2015 08:25:26 +0000</created>
                <updated>Thu, 25 Jun 2015 01:35:25 +0000</updated>
                            <resolved>Mon, 22 Jun 2015 14:29:08 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="950053" author="michael.cahill" created="Thu, 25 Jun 2015 01:35:25 +0000"  >&lt;p&gt;Wow &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=igor&quot; class=&quot;user-hover&quot; rel=&quot;igor&quot;&gt;igor&lt;/a&gt;, that&apos;s... creative.  I think we should get &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16413&quot; title=&quot;Storage engines that allow online compaction should not take an exclusive lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16413&quot;&gt;&lt;del&gt;SERVER-16413&lt;/del&gt;&lt;/a&gt; rather than copying that approach in WiredTiger.&lt;/p&gt;</comment>
                            <comment id="947138" author="igor" created="Mon, 22 Jun 2015 17:20:24 +0000"  >&lt;p&gt;It would be nice to have, but not really hi-pri since we have hacked up compact-all API through setParameter() &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/wink.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb-partners/mongo-rocks/blob/master/src/rocks_parameters.h#L72&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb-partners/mongo-rocks/blob/master/src/rocks_parameters.h#L72&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="946935" author="dan@10gen.com" created="Mon, 22 Jun 2015 14:29:08 +0000"  >&lt;p&gt;Duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16413&quot; title=&quot;Storage engines that allow online compaction should not take an exclusive lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16413&quot;&gt;&lt;del&gt;SERVER-16413&lt;/del&gt;&lt;/a&gt; (thanks for reminding me Igor).  Can you give me a sense of how important this feature is for RocksDB?&lt;/p&gt;</comment>
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