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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-28734] Recover WiredTiger data files when lacking metadata, but have _mdb_catalog data</title>
                <link>https://jira.mongodb.org/browse/SERVER-28734</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Occasionally someone might accidentally delete a metadata file - it would be nice to have a way to fetch all the bson from the data files that are now &quot;orphaned&quot;.&lt;/p&gt;

&lt;p&gt;This ticket will only support this behavior on Unix systems.&lt;/p&gt;</description>
                <environment></environment>
        <key id="372963">SERVER-28734</key>
            <summary>Recover WiredTiger data files when lacking metadata, but have _mdb_catalog data</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="asya.kamsky@mongodb.com">Asya Kamsky</reporter>
                        <labels>
                            <label>SEKB</label>
                    </labels>
                <created>Tue, 11 Apr 2017 14:55:39 +0000</created>
                <updated>Tue, 14 Aug 2018 14:40:38 +0000</updated>
                            <resolved>Wed, 8 Aug 2018 20:10:45 +0000</resolved>
                                                    <fixVersion>4.0.2</fixVersion>
                    <fixVersion>4.1.2</fixVersion>
                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1975337" author="xgen-internal-githook" created="Tue, 14 Aug 2018 14:37:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;louiswilliams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;name&apos;: &apos;Louis Williams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28734&quot; title=&quot;Recover WiredTiger data files when lacking metadata, but have _mdb_catalog data&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28734&quot;&gt;&lt;del&gt;SERVER-28734&lt;/del&gt;&lt;/a&gt; Recover WiredTiger data files when lacking metadata, but have _mdb_catalog data&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 840cf50e5b071103fca33ff24e39333064c07f18)&lt;/p&gt;

&lt;p&gt;Conflicts:&lt;br/&gt;
	src/mongo/db/storage/kv/kv_storage_engine_test.cpp&lt;br/&gt;
	src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.h&lt;br/&gt;
	src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine_test.cpp&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9177af70286a6debabd97665b5720916488a99fc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9177af70286a6debabd97665b5720916488a99fc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1970814" author="xgen-internal-githook" created="Wed, 8 Aug 2018 20:09:43 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28734&quot; title=&quot;Recover WiredTiger data files when lacking metadata, but have _mdb_catalog data&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28734&quot;&gt;&lt;del&gt;SERVER-28734&lt;/del&gt;&lt;/a&gt; Recover WiredTiger data files when lacking metadata, but have _mdb_catalog data&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/840cf50e5b071103fca33ff24e39333064c07f18&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/840cf50e5b071103fca33ff24e39333064c07f18&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1946860" author="xgen-internal-githook" created="Fri, 13 Jul 2018 15:59:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;xy24&apos;, &apos;name&apos;: &apos;Xiangyu Yao&apos;, &apos;email&apos;: &apos;xiangyu.yao@mongodb.com&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28734&quot; title=&quot;Recover WiredTiger data files when lacking metadata, but have _mdb_catalog data&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28734&quot;&gt;&lt;del&gt;SERVER-28734&lt;/del&gt;&lt;/a&gt; Provide a way to recover data files when lacking WiredTiger metadata, but have _mdb_catalog data&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit ca2b902002110013479af34f0ce6dee9906d9ad9.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/70973a0aaabaad1550376aa8913fd7fa46e7af72&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/70973a0aaabaad1550376aa8913fd7fa46e7af72&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1943662" author="xgen-internal-githook" created="Tue, 10 Jul 2018 20:23:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;louiswilliams&apos;, &apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28734&quot; title=&quot;Recover WiredTiger data files when lacking metadata, but have _mdb_catalog data&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28734&quot;&gt;&lt;del&gt;SERVER-28734&lt;/del&gt;&lt;/a&gt; Provide a way to recover data files when lacking WiredTiger metadata, but have _mdb_catalog data&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ca2b902002110013479af34f0ce6dee9906d9ad9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ca2b902002110013479af34f0ce6dee9906d9ad9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1934375" author="louis.williams" created="Thu, 28 Jun 2018 21:58:13 +0000"  >&lt;p&gt;This ticket will allow WiredTiger.wt files that have orphaned a collection as a result of a salvage to rebuild the metadata for that collection during repair.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35629&quot; title=&quot;Use WiredTiger salvage API for repairing metadata files&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35629&quot;&gt;&lt;del&gt;SERVER-35629&lt;/del&gt;&lt;/a&gt; has been created to handle corrupt WiredTiger.wt metadata files.&lt;/p&gt;</comment>
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