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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-56507] Change default block compressor to Zstandard</title>
                <link>https://jira.mongodb.org/browse/SERVER-56507</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;At the moment, the default compressor is snappy and it will be changed to zstd.&lt;/p&gt;

&lt;p&gt;The scope of this ticket is only to change the default block compressor from snappy to zstd.&#160;&lt;/p&gt;

&lt;p&gt;&#160;Ability to customize the compression level is not part of this ticket.&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1696492">SERVER-56507</key>
            <summary>Change default block compressor to Zstandard</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="vamsi.krishna@mongodb.com">Vamsi Boyapati</assignee>
                                    <reporter username="vamsi.krishna@mongodb.com">Vamsi Boyapati</reporter>
                        <labels>
                    </labels>
                <created>Fri, 30 Apr 2021 00:59:06 +0000</created>
                <updated>Mon, 4 Apr 2022 23:29:54 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="3847017" author="luke.chen" created="Fri, 28 May 2021 07:13:47 +0000"  >&lt;p&gt;The change was reverted on both master and v5.0 branches.&lt;/p&gt;</comment>
                            <comment id="3847015" author="xgen-internal-githook" created="Fri, 28 May 2021 07:09:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Monica Ng&apos;, &apos;email&apos;: &apos;monica.ng@mongodb.com&apos;, &apos;username&apos;: &apos;mm-ng&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56507&quot; title=&quot;Change default block compressor to Zstandard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56507&quot;&gt;SERVER-56507&lt;/a&gt; Change default block compressor to Zstandard&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 02d6940401bd6ff2696decc90dd01398f0bd6065.&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/668b4b960866d0ed7bd57726c7be65a53c19d2d2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/668b4b960866d0ed7bd57726c7be65a53c19d2d2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3847010" author="xgen-internal-githook" created="Fri, 28 May 2021 06:49:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Monica Ng&apos;, &apos;email&apos;: &apos;monica.ng@mongodb.com&apos;, &apos;username&apos;: &apos;mm-ng&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56507&quot; title=&quot;Change default block compressor to Zstandard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56507&quot;&gt;SERVER-56507&lt;/a&gt; Change default block compressor to Zstandard&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 02d6940401bd6ff2696decc90dd01398f0bd6065.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8572568d933c61cde410af65771baae16df1e313&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8572568d933c61cde410af65771baae16df1e313&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3768250" author="xgen-internal-githook" created="Wed, 12 May 2021 04:48:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Monica Ng&apos;, &apos;email&apos;: &apos;monica.ng@mongodb.com&apos;, &apos;username&apos;: &apos;mm-ng&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56507&quot; title=&quot;Change default block compressor to Zstandard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56507&quot;&gt;SERVER-56507&lt;/a&gt; Change default block compressor to Zstandard&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/02d6940401bd6ff2696decc90dd01398f0bd6065&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/02d6940401bd6ff2696decc90dd01398f0bd6065&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3760184" author="vamsi.krishna" created="Fri, 7 May 2021 02:52:57 +0000"  >&lt;p&gt;I have created separate patch builds for block compressor change and for journal compressor change.&lt;br/&gt;
&lt;a href=&quot;https://spruce.mongodb.com/version/6094a4010305b97a9024cb00/tasks?sorts=STATUS%3AASC%3BBASE_STATUS%3ADESC&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Block compressor master patch build&lt;/a&gt;.&lt;br/&gt;
&lt;a href=&quot;https://spruce.mongodb.com/version/6094a42c1e2d173e7e01f521/tasks?sorts=STATUS%3AASC%3BBASE_STATUS%3ADESC&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Block compressor perf patch build&lt;/a&gt;.&lt;br/&gt;
&lt;a href=&quot;https://spruce.mongodb.com/version/6094a467e3c3317b65700eb9/tasks?sorts=STATUS%3AASC%3BBASE_STATUS%3ADESC&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Journal compressor master patch build&lt;/a&gt;.&lt;br/&gt;
&lt;a href=&quot;https://spruce.mongodb.com/version/6094a47a30661559e1652c4e/tasks?sorts=STATUS%3AASC%3BBASE_STATUS%3ADESC&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Journal compressor perf patch build&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="3755606" author="vamsi.krishna" created="Wed, 5 May 2021 01:03:01 +0000"  >&lt;p&gt;As part of this ticket, we ran in to issue with upgrade/downgrade.&lt;br/&gt;
The options available are :&lt;br/&gt;
1. Explore FCV version setting&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;1a. Use zstd compressor when FCV equals 5.0&lt;/li&gt;
	&lt;li&gt;1b. Use snappy compressor when FCV equals 4.4&lt;/li&gt;
	&lt;li&gt;1c. Transition compressor when set FCV is called.&lt;/li&gt;
	&lt;li&gt;#1ca. Switch the log file.&lt;/li&gt;
	&lt;li&gt;1d.Ensure startup works before FCV is available in 4.4 and 5.0 compatibility.&lt;br/&gt;
2. Force transition to snappy on clean shutdown in 5.0&lt;br/&gt;
3. Change compressor from zstd to snappy during shutdown while closing. &lt;br/&gt;
4. 5.0 should be able to start with existing snappy log files. &lt;/li&gt;
&lt;/ol&gt;
</comment>
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                                        <issuelink>
            <issuekey id="1518754">SERVER-51735</issuekey>
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            <issuekey id="1710966">SERVER-56858</issuekey>
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