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    <title>MongoDB Jira</title>
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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-39769] Empty WiredTiger.backup causes restore from backup to fail</title>
                <link>https://jira.mongodb.org/browse/SERVER-39769</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After calling the&#160;db.fsyncLock() command and it returning, the&#160;WiredTiger.backup file is created. After waiting 20 seconds I make a Google Cloud disk snapshot. Restoring from this snapshot shows that WiredTiger.backup is zero bytes. This causes MongoDB to not be able to restore correctly on startup and there being no databases. Adding a manual call to the Linux sync command before making the snapshot remedies this. It seems like MongoDB should be syncing WiredTiger.backup to disk before the&#160;db.fsyncLock() command returns.&lt;/p&gt;

&lt;p&gt;Ubuntu&#160;18.04&lt;/p&gt;</description>
                <environment></environment>
        <key id="703045">SERVER-39769</key>
            <summary>Empty WiredTiger.backup causes restore from backup to fail</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="3">Duplicate</resolution>
                                        <assignee username="sue.loverso@mongodb.com">Susan LoVerso</assignee>
                                    <reporter username="lukejolly">Luke Jolly</reporter>
                        <labels>
                            <label>SWNA</label>
                    </labels>
                <created>Fri, 22 Feb 2019 19:28:31 +0000</created>
                <updated>Fri, 1 Mar 2019 21:20:23 +0000</updated>
                            <resolved>Fri, 1 Mar 2019 21:20:23 +0000</resolved>
                                    <version>3.2.21</version>
                    <version>4.0.6</version>
                                                    <component>WiredTiger</component>
                                        <votes>1</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="2167866" author="sue.loverso" created="Fri, 1 Mar 2019 20:03:03 +0000"  >&lt;p&gt;You are correct, it does appear that we&apos;re not correctly syncing out the backup file. I have opened &lt;a href=&quot;https://jira.mongodb.org/browse/WT-4615&quot; title=&quot;Sync backup file before returning backup cursor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-4615&quot;&gt;&lt;del&gt;WT-4615&lt;/del&gt;&lt;/a&gt; for the WiredTiger library changes to fix this issue.&lt;/p&gt;</comment>
                            <comment id="2163117" author="bruce.lucas@10gen.com" created="Tue, 26 Feb 2019 16:20:33 +0000"  >&lt;p&gt;I used strace to verify that we fsync neither the backup file nor the directory where it&apos;s located. Shouldn&apos;t we do that to ensure that fsyncLock persists everything required, in order to allow snapshot backups and also to protect against crashes while fsyncLock&apos;ed?&lt;/p&gt;

&lt;p&gt;Checked 4.0.6, reported above in 3.2, so I assume it affects all versions.&lt;/p&gt;</comment>
                            <comment id="2160209" author="lukejolly" created="Fri, 22 Feb 2019 19:48:10 +0000"  >&lt;p&gt;When WiredTiger.backup is zero bytes and MongoDB fails to recover, this log happens:&lt;/p&gt;

&lt;p&gt;&quot;WiredTiger message Both WiredTiger.turtle and WiredTiger.backup exist; recreating metadata from backup&quot;&lt;/p&gt;

&lt;p&gt;Weirdly,&#160;WiredTiger.turtle and WiredTiger.backup always exist, but that log is only printed when&#160;WiredTiger.backup is zero bytes.&lt;/p&gt;</comment>
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	&lt;li&gt;Call&#160;db.fsyncLock()&lt;/li&gt;
	&lt;li&gt;Take FS snapshot shortly after without syncing to disk&lt;/li&gt;
	&lt;li&gt;Restore snapshot&lt;/li&gt;
	&lt;li&gt;WiredTiger.backup is zero bytes&lt;/li&gt;
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