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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-8847] Implement dynamic storage format version migration</title>
                <link>https://jira.mongodb.org/browse/SERVER-8847</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The idea here is to implement a persistent script which can automatically modify the storage format when upgrading/downgrading versions that may break compatibility.  Consider the following sequence of events:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;User upgrades from v2.6 to v2.8 and starts mongod.&lt;/li&gt;
	&lt;li&gt;mongod stores a set of migration scripts in a serialized file.&lt;/li&gt;
	&lt;li&gt;mongod migrates the datafiles to a new format and bumps the pdfile version.&lt;/li&gt;
	&lt;li&gt;User downgrades to v2.6&lt;/li&gt;
	&lt;li&gt;mongod sees pdfile version is for v2.8, then looks for a &apos;v2.8 to v2.6&apos; migration script.
	&lt;ol&gt;
		&lt;li&gt;If found, mongod executes the script.&lt;/li&gt;
		&lt;li&gt;Otherwise, existing behavior is preserved.&lt;/li&gt;
	&lt;/ol&gt;
	&lt;/li&gt;
	&lt;li&gt;mongod overwrites the pdfile version to v2.6 (possibly storing a list of past version migrations).&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;If, for example, the format change involved a new data structure for free space management, the script could be written to either execute a repair operation, or read the v2.8 data structure(s) and write out the v2.6 data structure(s).&lt;/p&gt;
</description>
                <environment></environment>
        <key id="67296">SERVER-8847</key>
            <summary>Implement dynamic storage format version migration</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="benjamin.becker">Ben Becker</reporter>
                        <labels>
                    </labels>
                <created>Tue, 5 Mar 2013 00:59:26 +0000</created>
                <updated>Tue, 6 Dec 2022 05:23:36 +0000</updated>
                            <resolved>Thu, 9 Jan 2020 20:53:32 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
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