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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-30150] Two Phase Drops: rolling back cross database renameCollections fails if there is both a dropTarget and dropSource collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-30150</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;With a renameCollection command across databases, it is possible that two collections are specified to drop at the same optime, the dropSource and dropTarget collections. When we try to rollback these two drops using 2-phase drop, because the two drops have the same optime, the following error is thrown below. This is only a problem with renameCollection across databases. In a same database renames, only dropTarget can be present.&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Failed to add drop-pending collection foo.system.drop.2i0t5.t with drop optime { ts: Timestamp &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2000&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;|&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;0&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;, t: &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;5&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; }. There is already an existing collection test.system.drop.2i0t5.t with the same drop optime.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;The collections are in two different databases, &quot;foo&quot; and &quot;test,&quot; but have the same optime, &quot;2i0t5.&quot;&lt;/p&gt;</description>
                <environment></environment>
        <key id="404163">SERVER-30150</key>
            <summary>Two Phase Drops: rolling back cross database renameCollections fails if there is both a dropTarget and dropSource collection</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="benety.goh@mongodb.com">Benety Goh</assignee>
                                    <reporter username="allison.chang">Allison Chang</reporter>
                        <labels>
                    </labels>
                <created>Fri, 14 Jul 2017 19:08:52 +0000</created>
                <updated>Mon, 30 Oct 2023 23:15:14 +0000</updated>
                            <resolved>Fri, 21 Jul 2017 15:54:31 +0000</resolved>
                                                    <fixVersion>3.5.11</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1628709" author="xgen-internal-githook" created="Fri, 21 Jul 2017 15:54:06 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;benety&apos;, u&apos;name&apos;: u&apos;Benety Goh&apos;, u&apos;email&apos;: u&apos;benety@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30150&quot; title=&quot;Two Phase Drops: rolling back cross database renameCollections fails if there is both a dropTarget and dropSource collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30150&quot;&gt;&lt;del&gt;SERVER-30150&lt;/del&gt;&lt;/a&gt; DropPendingCollectionReaper::rollBackDropPendingCollection() rolls back at most one drop-pending collection.&lt;/p&gt;

&lt;p&gt;Since it is now possible for multiple drop-pending collections (in different databases) to be linked&lt;br/&gt;
to the same drop optime, this function requires the fully qualified original collection optime to be&lt;br/&gt;
able to locate the correct entry in the drop pending collection multimap.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/056e90b4fb8d6d50c011cbeb655bed3fdc0d9b0f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/056e90b4fb8d6d50c011cbeb655bed3fdc0d9b0f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1627971" author="xgen-internal-githook" created="Thu, 20 Jul 2017 20:40:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;benety&apos;, u&apos;name&apos;: u&apos;Benety Goh&apos;, u&apos;email&apos;: u&apos;benety@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30150&quot; title=&quot;Two Phase Drops: rolling back cross database renameCollections fails if there is both a dropTarget and dropSource collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30150&quot;&gt;&lt;del&gt;SERVER-30150&lt;/del&gt;&lt;/a&gt; DropPendingCollectionReaper supports multiple drop-pending namespaces per drop optime&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/808368314d1036b022334b67a9b2bd306daab840&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/808368314d1036b022334b67a9b2bd306daab840&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1627525" author="xgen-internal-githook" created="Thu, 20 Jul 2017 15:20:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;benety&apos;, u&apos;name&apos;: u&apos;Benety Goh&apos;, u&apos;email&apos;: u&apos;benety@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30150&quot; title=&quot;Two Phase Drops: rolling back cross database renameCollections fails if there is both a dropTarget and dropSource collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30150&quot;&gt;&lt;del&gt;SERVER-30150&lt;/del&gt;&lt;/a&gt; remove DropPendingCollectionReaper::dropCollectionAtOpTime()&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/878e55a460de02de2f0171d3e9e1bcfc12bb80cc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/878e55a460de02de2f0171d3e9e1bcfc12bb80cc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1622486" author="judah.schvimer" created="Fri, 14 Jul 2017 19:22:25 +0000"  >&lt;p&gt;A &lt;tt&gt;renameCollection&lt;/tt&gt; op can lead to two 2-phase-drops, one for &lt;tt&gt;dropTarget&lt;/tt&gt; and one for &lt;tt&gt;dropSource&lt;/tt&gt;. The machinery currently only allows for 1 collection to be dropped per OpTime. &lt;/p&gt;</comment>
                            <comment id="1622469" author="milkie" created="Fri, 14 Jul 2017 19:10:49 +0000"  >&lt;p&gt;You can&apos;t have more than one collection with the same drop optime, can you?&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="400218">SERVER-29959</issuekey>
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            <issuekey id="353587">SERVER-27992</issuekey>
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&lt;p&gt;Rolling back a renameCollection command where it drops two collections in the same oplog entry because it is a cross-database rename with both dropSource and dropTarget specified.&lt;/p&gt;</customfieldvalue>

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