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    <title>MongoDB Jira</title>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-1512] backup objects deleted by rollback (WAS: Repl set: Behavior when resyncing -&gt; deleting documents)</title>
                <link>https://jira.mongodb.org/browse/SERVER-1512</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Just looking through docs + code:&lt;/p&gt;

&lt;p&gt;F = node that failed and coming back.&lt;br/&gt;
P = node that took over, new primary&lt;br/&gt;
From documentation and code in rs_rollback.cpp, appears we are deleting (or overwrite) data from &apos;F&apos; that was when it comes back online after being down&lt;/p&gt;

&lt;p&gt;In addition to deleting/updating, should we be copy the deleted versions of documents somewhere (e.g. some temp collection) &lt;br/&gt;
so that a manual re-application of the data is possible, if necessary?&lt;/p&gt;

&lt;p&gt;(sorry if this behavior is already there and I missed it)&lt;/p&gt;</description>
                <environment></environment>
        <key id="12589">SERVER-1512</key>
            <summary>backup objects deleted by rollback (WAS: Repl set: Behavior when resyncing -&gt; deleting documents)</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="eliot">Eliot Horowitz</assignee>
                                    <reporter username="nosh">nosh petigara</reporter>
                        <labels>
                    </labels>
                <created>Thu, 29 Jul 2010 17:54:03 +0000</created>
                <updated>Tue, 12 Jul 2016 00:18:27 +0000</updated>
                            <resolved>Tue, 3 Aug 2010 13:48:20 +0000</resolved>
                                    <version>1.5.6</version>
                                    <fixVersion>1.5.8</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="16788" author="mike" created="Thu, 12 Aug 2010 16:43:50 +0000"  >&lt;p&gt;Giving a bit more details on what happens here, since we&apos;re linking to this case to explain (Eliot please correct if I&apos;m wrong):&lt;/p&gt;

&lt;p&gt;When a document needs to be rolled back it first gets written/appended to a flat file in the data directory, in a subdirectory called &quot;rollback&quot;. The document gets written to a file named &amp;lt;current_ns&amp;gt;.&amp;lt;current_time&amp;gt;.&amp;lt;ordinal&amp;gt;.bson, and is written as a raw BSON document. The file should be treated as a sequence of raw BSON documents, much like the files generated by mongodump.&lt;/p&gt;</comment>
                            <comment id="16426" author="auto" created="Tue, 3 Aug 2010 15:28:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;erh&apos;, &apos;name&apos;: &apos;Eliot Horowitz&apos;, &apos;email&apos;: &apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: fix rollback saving &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1512&quot; title=&quot;backup objects deleted by rollback (WAS: Repl set: Behavior when resyncing -&amp;gt; deleting documents)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1512&quot;&gt;&lt;del&gt;SERVER-1512&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/625115721c13c93c2b17bab9bc0d686322fa9546&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/625115721c13c93c2b17bab9bc0d686322fa9546&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="16421" author="auto" created="Tue, 3 Aug 2010 13:48:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;erh&apos;, &apos;name&apos;: &apos;Eliot Horowitz&apos;, &apos;email&apos;: &apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: store rolled back info in flat files &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1512&quot; title=&quot;backup objects deleted by rollback (WAS: Repl set: Behavior when resyncing -&amp;gt; deleting documents)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1512&quot;&gt;&lt;del&gt;SERVER-1512&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/7207fe34dcb37bf0e284fa3d451ae6e858659b16&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/7207fe34dcb37bf0e284fa3d451ae6e858659b16&lt;/a&gt;&lt;/p&gt;</comment>
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