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    <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-60518] Best effort checks in range deleter can leave orphans</title>
                <link>https://jira.mongodb.org/browse/SERVER-60518</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This problem is present in different flavours on different branches.&lt;/p&gt;

&lt;p&gt;The objective of this ticket is to understand if such checks can be eliminated (e.g. relying on the local collection catalog) and - if not - how to fix the issue.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;v5.1 / v5.0&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;Before scheduling a range deletion task, a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d5c65ef2eae8fddc0a10c55a85accc1d4ba4e25a/src/mongo/db/s/migration_util.cpp#L420-L445&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;filtering metadata check (with eventual refresh) is performed&lt;/a&gt; to ensure the uuid is matching.&lt;br/&gt;
Afterwards, when actually scheduling the range cleanup, the metadata are &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d5c65ef2eae8fddc0a10c55a85accc1d4ba4e25a/src/mongo/db/s/migration_util.cpp#L361-L376&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;checked again&lt;/a&gt; without refresh and without any guarantee on collection changes.&lt;/p&gt;

&lt;p&gt;If - for some reason - the filtering metadata get cleared between the first and second check, the range deletion task ends up &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d5c65ef2eae8fddc0a10c55a85accc1d4ba4e25a/src/mongo/db/s/migration_util.cpp#L367&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;failing&lt;/a&gt;, leaving orphans on the node.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;v4.4&lt;/b&gt;&lt;br/&gt;
The two checks are happening &lt;a href=&quot;https://github.com/mongodb/mongo/blob/58971da1ef93435a9f62bf4708a81713def6e88c/src/mongo/db/s/migration_util.cpp#L346-L387&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;subsequently&lt;/a&gt;, but still metadata could be cleared in the very narrow &lt;a href=&quot;https://github.com/mongodb/mongo/blob/58971da1ef93435a9f62bf4708a81713def6e88c/src/mongo/db/s/migration_util.cpp#L373&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;interleaving between them&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1892515">SERVER-60518</key>
            <summary>Best effort checks in range deleter can leave orphans</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="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Thu, 7 Oct 2021 10:39:24 +0000</created>
                <updated>Sun, 29 Oct 2023 21:47:42 +0000</updated>
                            <resolved>Fri, 22 Oct 2021 17:29:51 +0000</resolved>
                                    <version>5.0.3</version>
                    <version>4.4.9</version>
                    <version>5.1.0-rc0</version>
                                    <fixVersion>5.2.0</fixVersion>
                    <fixVersion>5.0.4</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4166385" author="xgen-internal-githook" created="Wed, 3 Nov 2021 11:59:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Pierlauro Sciarelli&apos;, &apos;email&apos;: &apos;pierlauro.sciarelli@mongodb.com&apos;, &apos;username&apos;: &apos;pierlauro&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60518&quot; title=&quot;Best effort checks in range deleter can leave orphans&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60518&quot;&gt;&lt;del&gt;SERVER-60518&lt;/del&gt;&lt;/a&gt;  Best effort checks in range deleter must not leave orphans&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/62a84ede3cc9a334e8bc82160714df71e7d3a29e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/62a84ede3cc9a334e8bc82160714df71e7d3a29e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4150949" author="xgen-internal-githook" created="Wed, 27 Oct 2021 09:58:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Pierlauro Sciarelli&apos;, &apos;email&apos;: &apos;pierlauro.sciarelli@mongodb.com&apos;, &apos;username&apos;: &apos;pierlauro&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60518&quot; title=&quot;Best effort checks in range deleter can leave orphans&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60518&quot;&gt;&lt;del&gt;SERVER-60518&lt;/del&gt;&lt;/a&gt;  Best effort checks in range deleter must not leave orphans&lt;br/&gt;
Branch: v5.1&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7c57ae156eb9519c1cde7e30df1ee08d81efeb2d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7c57ae156eb9519c1cde7e30df1ee08d81efeb2d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4142666" author="xgen-internal-githook" created="Fri, 22 Oct 2021 17:27:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Pierlauro Sciarelli&apos;, &apos;email&apos;: &apos;pierlauro.sciarelli@mongodb.com&apos;, &apos;username&apos;: &apos;pierlauro&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60518&quot; title=&quot;Best effort checks in range deleter can leave orphans&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60518&quot;&gt;&lt;del&gt;SERVER-60518&lt;/del&gt;&lt;/a&gt;  Best effort checks in range deleter must not leave orphans&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3ed974c923ccbc97f55335c5c99b00cc0e5dad73&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3ed974c923ccbc97f55335c5c99b00cc0e5dad73&lt;/a&gt;&lt;/p&gt;</comment>
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