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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-30295] Connect FCV to WiredTiger compatibility version</title>
                <link>https://jira.mongodb.org/browse/SERVER-30295</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A recent version of WiredTiger had changes to the log (journal) file format. Those changes are gated on a compatibility version being used by applications.&lt;/p&gt;

&lt;p&gt;In order for MongoDB to start using the new log file formats, we need to connect the featureCompatibilityVersion mechanisms in to the WiredTiger compatibility configuration option.&lt;/p&gt;

&lt;p&gt;There was a change included with the merge of WiredTiger that means MongoDB will currently only ever create V1 format journal files:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp#L270&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp#L270&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="407854">SERVER-30295</key>
            <summary>Connect FCV to WiredTiger compatibility version</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="13201">Fixed</resolution>
                                        <assignee username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</assignee>
                                    <reporter username="alexander.gorrod@mongodb.com">Alexander Gorrod</reporter>
                        <labels>
                    </labels>
                <created>Tue, 25 Jul 2017 03:08:10 +0000</created>
                <updated>Mon, 30 Oct 2023 23:14:58 +0000</updated>
                            <resolved>Wed, 9 Aug 2017 13:35:15 +0000</resolved>
                                                    <fixVersion>3.5.12</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1643703" author="xgen-internal-githook" created="Wed, 9 Aug 2017 01:15:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;dgottlieb&apos;, &apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;, &apos;name&apos;: &apos;Daniel Gottlieb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30295&quot; title=&quot;Connect FCV to WiredTiger compatibility version&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30295&quot;&gt;&lt;del&gt;SERVER-30295&lt;/del&gt;&lt;/a&gt;: Connect FCV to WiredTiger compatibility version.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b0f8d105349d9d6df874ed7f566a552dbd98a1ab&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b0f8d105349d9d6df874ed7f566a552dbd98a1ab&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1643673" author="alexander.gorrod" created="Tue, 8 Aug 2017 23:58:26 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=daniel.gottlieb&quot; class=&quot;user-hover&quot; rel=&quot;daniel.gottlieb&quot;&gt;daniel.gottlieb&lt;/a&gt; The version of WiredTiger in master has been updated to include the fix for &lt;a href=&quot;https://jira.mongodb.org/browse/WT-3490&quot; title=&quot;WT_CURSOR.modify unaligned size_t access.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-3490&quot;&gt;&lt;del&gt;WT-3490&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1643486" author="daniel.gottlieb@10gen.com" created="Tue, 8 Aug 2017 20:21:26 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=michael.cahill&quot; class=&quot;user-hover&quot; rel=&quot;michael.cahill&quot;&gt;michael.cahill&lt;/a&gt; Unfortunately upgrading WT to run in release=3.0 turns on the unaligned access Keith is fixing: &lt;a href=&quot;https://jira.mongodb.org/browse/WT-3490&quot; title=&quot;WT_CURSOR.modify unaligned size_t access.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-3490&quot;&gt;&lt;del&gt;WT-3490&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;That breaks our &lt;/p&gt;
{A,UB}
&lt;p&gt;SAN tests, thus the revert. However, the patch is in the repo&apos;s history so hopefully that can hold you over until Keith&apos;s fix gets into MongoDB master.&lt;/p&gt;</comment>
                            <comment id="1643477" author="xgen-internal-githook" created="Tue, 8 Aug 2017 20:15:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;dgottlieb&apos;, &apos;email&apos;: &apos;danny.gottlieb@gmail.com&apos;, &apos;name&apos;: &apos;Daniel Gottlieb&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30295&quot; title=&quot;Connect FCV to WiredTiger compatibility version&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30295&quot;&gt;&lt;del&gt;SERVER-30295&lt;/del&gt;&lt;/a&gt;: Connect FCV to WiredTiger compatibility version.&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit c5a6b74a50e3fa39b1e24b0d4c2463d530bc9885.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6de1435b6f37aae5c79bbb4440ee84f6d36fe1e1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6de1435b6f37aae5c79bbb4440ee84f6d36fe1e1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1643335" author="xgen-internal-githook" created="Tue, 8 Aug 2017 18:30:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;dgottlieb&apos;, &apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;, &apos;name&apos;: &apos;Daniel Gottlieb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30295&quot; title=&quot;Connect FCV to WiredTiger compatibility version&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30295&quot;&gt;&lt;del&gt;SERVER-30295&lt;/del&gt;&lt;/a&gt;: Connect FCV to WiredTiger compatibility version.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c5a6b74a50e3fa39b1e24b0d4c2463d530bc9885&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c5a6b74a50e3fa39b1e24b0d4c2463d530bc9885&lt;/a&gt;&lt;/p&gt;</comment>
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