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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-62627] Implement the first phase of the restore algorithm where the storage engine prepares the backup</title>
                <link>https://jira.mongodb.org/browse/SERVER-62627</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;ul&gt;
	&lt;li&gt;Retrieve a list of the files that exist in the &lt;tt&gt;_restore&lt;/tt&gt; directory.&lt;/li&gt;
	&lt;li&gt;Remove any entries from the &lt;tt&gt;WiredTiger.backup&lt;/tt&gt; file for files not present in the &lt;tt&gt;_restore&lt;/tt&gt; directory.&lt;/li&gt;
	&lt;li&gt;Start an independent instance of WiredTiger on the &lt;tt&gt;_restore&lt;/tt&gt; directory.
	&lt;ul&gt;
		&lt;li&gt;WiredTiger will reconstruct the &lt;tt&gt;WiredTiger.wt&lt;/tt&gt; file from the &lt;tt&gt;WiredTiger.backup&lt;/tt&gt; file.&lt;/li&gt;
		&lt;li&gt;The journal files will be replayed. Replaying journal files can result in new files being created.&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;Using the list of files retrieved before starting WiredTiger, drop any newly created collection and index files.&lt;/li&gt;
	&lt;li&gt;Iterate over the records in the &lt;tt&gt;_mdb_catalog.wt&lt;/tt&gt; file and do the following:
	&lt;ul&gt;
		&lt;li&gt;Records mapping to files not present in the &lt;tt&gt;_restore&lt;/tt&gt; directory will be removed.&lt;/li&gt;
		&lt;li&gt;Check that all of the index files are present for a collection being restored.&lt;/li&gt;
		&lt;li&gt;Modify the namespace fields where a database rename was requested.&lt;/li&gt;
		&lt;li&gt;Modify the namespace fields of the record representing the oplog to &lt;tt&gt;local.oplog.restore&lt;/tt&gt;.&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;If a collection to restore is specified in &lt;tt&gt;config.system.restore&lt;/tt&gt; but is not present in the &lt;tt&gt;_mdb_catalog.wt&lt;/tt&gt; and vice-versa, abort the procedure.&lt;/li&gt;
	&lt;li&gt;Take a checkpoint.&lt;/li&gt;
	&lt;li&gt;For each collection and its indexes to restore, and the oplog:
	&lt;ul&gt;
		&lt;li&gt;Export the file and table metadata from WiredTiger (see here).&lt;/li&gt;
		&lt;li&gt;Export the catalog entry (&lt;tt&gt;_mdb_catalog.wt&lt;/tt&gt;) and fast count (&lt;tt&gt;sizeStorer.wt&lt;/tt&gt;).&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;Shutdown the WiredTiger instance.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1963767">SERVER-62627</key>
            <summary>Implement the first phase of the restore algorithm where the storage engine prepares the backup</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="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="gregory.wlodarek@mongodb.com">Gregory Wlodarek</reporter>
                        <labels>
                    </labels>
                <created>Thu, 13 Jan 2022 22:58:32 +0000</created>
                <updated>Tue, 6 Dec 2022 00:39:54 +0000</updated>
                            <resolved>Mon, 24 Jan 2022 14:38:06 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                    <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="1963768">SERVER-62628</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1963776">SERVER-62630</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1963779">SERVER-62632</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1963785">SERVER-62633</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1963787">SERVER-62634</issuekey>
        </issuelink>
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