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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-16692] Switching journalling off and on with WT not safe</title>
                <link>https://jira.mongodb.org/browse/SERVER-16692</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I&apos;ve been stopping and starting my mongod and this time after shutting it down successfully on startup it told me there was bad checksum in one of the collection files.&lt;/p&gt;

&lt;p&gt;WiredTiger will run recovery any time it is started with a journal enabled. If the preceding shutdown was clean, &lt;b&gt;and used the journal&lt;/b&gt;, recovery will be a noop. If the preceding shutdown did not use a journal, but an old log still exists, then I think recovery could overwrite changes made while the journal was disabled.&lt;/p&gt;

&lt;p&gt;My concern is that when WiredTiger writes a checkpoint, it records the current position in the log (a &quot;log sequence number&quot; or LSN). When the journal is disabled, we don&apos;t have an LSN to record, so after a restart with the journal enabled, I think we could be running recovery when we don&apos;t want to.&lt;/p&gt;

&lt;p&gt;WiredTiger doesn&apos;t attempt to drain the logs (what WT calls &quot;log archive&quot;) if the journal is disabled. A simpler fix for this issue would be to record a special LSN for checkpoints if the journal is disabled, and skip recovery if we see that LSN when restarting with a journal enabled.&lt;/p&gt;</description>
                <environment></environment>
        <key id="176429">SERVER-16692</key>
            <summary>Switching journalling off and on with WT not safe</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="michael.cahill@mongodb.com">Michael Cahill</assignee>
                                    <reporter username="michael.cahill@mongodb.com">Michael Cahill</reporter>
                        <labels>
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                <created>Tue, 30 Dec 2014 05:03:48 +0000</created>
                <updated>Thu, 15 Jan 2015 16:46:43 +0000</updated>
                            <resolved>Tue, 6 Jan 2015 03:55:39 +0000</resolved>
                                    <version>2.8.0-rc4</version>
                                    <fixVersion>2.8.0-rc5</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
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