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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-67726] Add mechanism to change compression of an existing collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-67726</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I&apos;d like to switch my database from Snappy to Zstd compression.&lt;br/&gt;
&#160;&lt;br/&gt;
Currently, it doesn&apos;t seem that it is possible to change the compression of an existing collection.&lt;br/&gt;
&#160;&lt;br/&gt;
It would be nice if there were a way to do this, even if (for example) it required making a new replica set member which &quot;re-compresses&quot; the data to the new algorithm while cloning it.&lt;br/&gt;
&#160;&lt;br/&gt;
My account rep is recommending today that I create a new collection and manually copy with mongodump/mongorestore which doesn&apos;t seem to be a viable option, for data consistency reasons.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2081032">SERVER-67726</key>
            <summary>Add mechanism to change compression of an existing collection</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="chris.kelly@mongodb.com">Chris Kelly</assignee>
                                    <reporter username="shields@tablecheck.com">Johnny Shields</reporter>
                        <labels>
                    </labels>
                <created>Fri, 1 Jul 2022 07:56:52 +0000</created>
                <updated>Tue, 5 Jul 2022 16:08:38 +0000</updated>
                            <resolved>Tue, 5 Jul 2022 14:44:40 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4657864" author="JIRAUSER1254095" created="Tue, 5 Jul 2022 16:08:38 +0000"  >&lt;p&gt;Chris &amp;gt; thank you for clarifying. Will raise feedback.&lt;/p&gt;</comment>
                            <comment id="4657456" author="JIRAUSER1265262" created="Tue, 5 Jul 2022 14:43:25 +0000"  >&lt;p&gt;Johnny,&lt;/p&gt;

&lt;p&gt;Thanks for you report. Changing the compression method of an existing collection is not something that is currently supported. However, you can request this feature over at &lt;a href=&quot;https://feedback.mongodb.com/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;feedback.mongodb.com&lt;/a&gt;. We&apos;re starting to direct new feature requests and improvements to that channel and preferring this JIRA project for bug reports specifically.&lt;/p&gt;

&lt;p&gt;You may also want to search and post on the &lt;a href=&quot;https://community.mongodb.com/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MongoDB Developer Community Forums&lt;/a&gt;, as it&apos;s possible there are others who have guidance on how to satisfy your use-case.&lt;/p&gt;

&lt;p&gt;Compression settings are observed only during collection creation (see&#160;&lt;a href=&quot;https://docs.mongodb.com/manual/core/wiredtiger/#compression&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Compression&#160;14&lt;/a&gt;). You can create a new collection with the parameters you need, as described in the &lt;a href=&quot;https://docs.mongodb.org/manual/reference/method/db.createCollection/#specify-storage-engine-options&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Specify Storage Engine Options&lt;/a&gt;&#160;page.&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.createCollection( &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;uncompressed&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;, { storageEngine: { wiredTiger: { configString: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;block_compressor=none&apos;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; }}} &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;You should be able to select zstd here. Mongodump/mongorestore seems like the most convenient option for this, short of writing something yourself that will manually replicate this data to another collection using the new compression method.&lt;/p&gt;

&lt;p&gt;I&apos;ll close this for now, but if you would like to see this as a feature in the future, please mention it at &lt;a href=&quot;https://feedback.mongodb.com/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;feedback.mongodb.com&lt;/a&gt; to get it on the radar.&lt;/p&gt;

&lt;p&gt;Regards,&lt;/p&gt;

&lt;p&gt;Christopher&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
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