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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-15319] Verify 2.8 freelist is upgrade-downgrade safe with 2.6</title>
                <link>https://jira.mongodb.org/browse/SERVER-15319</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Know issues:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;If compact is run on a downgraded server (ran 2.8, now running 2.6), it will attempt to orphan the deleted list, but will not orphan the 2.8-only portion. If such a server was upgraded in the future, it would try to use deleted records in freed extents.
	&lt;ul&gt;
		&lt;li&gt;Solution: have 2.6 zero-out reserved bytes in NamespaceDetails when orphaning the deleted list during a compact.&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="159064">SERVER-15319</key>
            <summary>Verify 2.8 freelist is upgrade-downgrade safe with 2.6</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="9">Done</resolution>
                                        <assignee username="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                    </labels>
                <created>Thu, 18 Sep 2014 22:48:33 +0000</created>
                <updated>Thu, 2 Aug 2018 21:25:06 +0000</updated>
                            <resolved>Thu, 25 Sep 2014 20:27:33 +0000</resolved>
                                                    <fixVersion>2.6.5</fixVersion>
                    <fixVersion>2.7.8</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="744867" author="xgen-internal-githook" created="Sun, 19 Oct 2014 18:28:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15319&quot; title=&quot;Verify 2.8 freelist is upgrade-downgrade safe with 2.6&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15319&quot;&gt;&lt;del&gt;SERVER-15319&lt;/del&gt;&lt;/a&gt; Fix stats.js for new pdfile version&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d62a1f4e030f9e50afededd8f2b2167649c40696&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d62a1f4e030f9e50afededd8f2b2167649c40696&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="744689" author="xgen-internal-githook" created="Sat, 18 Oct 2014 00:44:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15319&quot; title=&quot;Verify 2.8 freelist is upgrade-downgrade safe with 2.6&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15319&quot;&gt;&lt;del&gt;SERVER-15319&lt;/del&gt;&lt;/a&gt; Multiversion test for freelist upgrade-downgrade&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3c54ca1f58084845b7f778bde2f8a0f2138f727e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3c54ca1f58084845b7f778bde2f8a0f2138f727e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="744687" author="xgen-internal-githook" created="Sat, 18 Oct 2014 00:44:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15319&quot; title=&quot;Verify 2.8 freelist is upgrade-downgrade safe with 2.6&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15319&quot;&gt;&lt;del&gt;SERVER-15319&lt;/del&gt;&lt;/a&gt; Bump file versions for 2.8-style freelist&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7e7439bab78da9c993fcf566e4ea8d5c0570ad8d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7e7439bab78da9c993fcf566e4ea8d5c0570ad8d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="744686" author="xgen-internal-githook" created="Sat, 18 Oct 2014 00:44:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14081&quot; title=&quot;Freelist improvements&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14081&quot;&gt;&lt;del&gt;SERVER-14081&lt;/del&gt;&lt;/a&gt; Add more deletedList buckets to cover more sizes&lt;/p&gt;

&lt;p&gt;This is done in a backward compatible way without orphaning any old data.&lt;br/&gt;
Downgrading after this patch &lt;b&gt;will&lt;/b&gt; orphan large (&amp;gt;=4MB) deleted records, but&lt;br/&gt;
they will be usable again after upgrading. Additionally, the compact command&lt;br/&gt;
should not be run on a downgraded server until &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15319&quot; title=&quot;Verify 2.8 freelist is upgrade-downgrade safe with 2.6&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15319&quot;&gt;&lt;del&gt;SERVER-15319&lt;/del&gt;&lt;/a&gt; is resolved.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4d34532dbf749fe2c9df9ed7421db196eaf93632&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4d34532dbf749fe2c9df9ed7421db196eaf93632&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="726477" author="xgen-internal-githook" created="Wed, 24 Sep 2014 20:48:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;redbeard0531@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15319&quot; title=&quot;Verify 2.8 freelist is upgrade-downgrade safe with 2.6&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15319&quot;&gt;&lt;del&gt;SERVER-15319&lt;/del&gt;&lt;/a&gt; Handle 2.8-style freelist bit in pdfile version&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d80e60ba69909ff6131da82674c6c9e788b28e4d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d80e60ba69909ff6131da82674c6c9e788b28e4d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="724575" author="redbeard0531" created="Mon, 22 Sep 2014 22:22:35 +0000"  >&lt;p&gt;We decided to bump the PD file minor version in 2.8 to prevent downgrading to older than 2.6.5.&lt;/p&gt;</comment>
                            <comment id="724494" author="xgen-internal-githook" created="Mon, 22 Sep 2014 21:09:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;redbeard0531@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15319&quot; title=&quot;Verify 2.8 freelist is upgrade-downgrade safe with 2.6&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15319&quot;&gt;&lt;del&gt;SERVER-15319&lt;/del&gt;&lt;/a&gt; Forward-compatible change for 2.8 freelist&lt;/p&gt;

&lt;p&gt;Makes NamespaceDetails::orphanDeletedList() also orphan the new 2.8-only&lt;br/&gt;
deleted lists. This ensures that 2.8 won&apos;t attempt to reuse the space in&lt;br/&gt;
extents that no longer belong to this collection.&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7f3e27009faafa5b3f8913f05c1be3d49e36ff08&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7f3e27009faafa5b3f8913f05c1be3d49e36ff08&lt;/a&gt;&lt;/p&gt;</comment>
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