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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>
    </build-info>


<item>
            <title>[SERVER-46386] Refining a shard key may lead to an orphan range never being cleaned up</title>
                <link>https://jira.mongodb.org/browse/SERVER-46386</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;tt&gt;config.rangeDeletions&lt;/tt&gt; collection stores a document of the following form to track range deletion tasks needing to be performed:&lt;/p&gt;

&lt;p/&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;{&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;    &quot;_id&quot; : UUID(&quot;78447b8a-84d6-4555-a97d-b4bc2d708e29&quot;),&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;    &quot;nss&quot; : &quot;test4_fsmdb0.fsmcoll0_29&quot;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;    &quot;collectionUuid&quot; : UUID(&quot;1eafdb97-2114-4b72-a6ce-34e96aa3df1a&quot;),&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;    &quot;donorShardId&quot; : &quot;shard-rs1&quot;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;    &quot;range&quot; : {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;        &quot;min&quot; : {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;            &quot;a&quot; : 400&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;        &quot;max&quot; : {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 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;            &quot;a&quot; : { &quot;$maxKey&quot; : 1 }&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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			&lt;/td&gt;
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			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;The &quot;range&quot; field of this document is left unmodified after a user has successfully run the &lt;tt&gt;refineCollectionShardKey&lt;/tt&gt; command. This means if the following sequence of events occurs, then &lt;a href=&quot;https://github.com/mongodb/mongo/blob/0aac1805c04aa5b1481ba99dcab2273d423df10c/src/mongo/db/s/metadata_manager.cpp#L329-L335&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;a &quot;RangeOverlapConflict: Requested deletion range overlaps a live shard chunk&quot; error&lt;/a&gt; will prevent the range deleter from ever deleting the range of orphan documents.&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;The &lt;tt&gt;test4&amp;#95;fsmdb0.fsmcoll0&amp;#95;29&lt;/tt&gt; collection is sharded on {&lt;tt&gt;a: 1&lt;/tt&gt;} and has chunks
	&lt;ul&gt;
		&lt;li&gt;{&lt;tt&gt;a: MinKey} &amp;#45;&amp;gt; {a: 100&lt;/tt&gt;}&lt;/li&gt;
		&lt;li&gt;{&lt;tt&gt;a: 100} &amp;#45;&amp;gt; {a: 200&lt;/tt&gt;}&lt;/li&gt;
		&lt;li&gt;{&lt;tt&gt;a: 200} &amp;#45;&amp;gt; {a: 300&lt;/tt&gt;}&lt;/li&gt;
		&lt;li&gt;{&lt;tt&gt;a: 300} &amp;#45;&amp;gt; {a: 400&lt;/tt&gt;}&lt;/li&gt;
		&lt;li&gt;{&lt;tt&gt;a: 400} &amp;#45;&amp;gt; {a: MaxKey&lt;/tt&gt;}&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;A migration begins for chunk {&lt;tt&gt;a: 400} &amp;#45;&amp;gt; {a: MaxKey&lt;/tt&gt;} from shard-rs1 to shard-rs0.&lt;/li&gt;
	&lt;li&gt;Migration completes successfully but the primary of shard-rs1 steps down before the range deletion task completes.&lt;/li&gt;
	&lt;li&gt;User runs the &lt;tt&gt;refineCollectionShardKey&lt;/tt&gt; and changes the shard key of the &lt;tt&gt;test4&amp;#95;fsmdb0.fsmcoll0&amp;#95;29&lt;/tt&gt; collection to {&lt;tt&gt;a: 1, b: 1&lt;/tt&gt;}. The chunks are therefore augmented to be
	&lt;ul&gt;
		&lt;li&gt;{&lt;tt&gt;a: MinKey, b: MinKey} &amp;#45;&amp;gt; {a: 100, b: MinKey&lt;/tt&gt;}&lt;/li&gt;
		&lt;li&gt;{&lt;tt&gt;a: 100, b: MinKey} &amp;#45;&amp;gt; {a: 200, b: MinKey&lt;/tt&gt;}&lt;/li&gt;
		&lt;li&gt;{&lt;tt&gt;a: 200, b: MinKey} &amp;#45;&amp;gt; {a: 300, b: MinKey&lt;/tt&gt;}&lt;/li&gt;
		&lt;li&gt;{&lt;tt&gt;a: 300, b: MinKey} &amp;#45;&amp;gt; {a: 400, b: MinKey&lt;/tt&gt;}&lt;/li&gt;
		&lt;li&gt;{&lt;tt&gt;a: 400, b: MinKey} &amp;#45;&amp;gt; {a: MaxKey, b: MaxKey&lt;/tt&gt;}&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;The newly elected primary of shard-rs1 attempts to schedule the range deletion task still present in its &lt;tt&gt;config.rangeDeletions&lt;/tt&gt; collection. Since the {&lt;tt&gt;a: 300, b: MinKey} &amp;#45;&amp;gt; {a: 400, b: MinKey&lt;/tt&gt;} range is considered to partially overlap with the range {&lt;tt&gt;a: 400} &amp;#45;&amp;gt; {a: MaxKey&lt;/tt&gt;} &lt;a href=&quot;https://github.com/mongodb/mongo/blob/0aac1805c04aa5b1481ba99dcab2273d423df10c/src/mongo/bson/bsonobj.cpp#L291-L292&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;because {&lt;tt&gt;a: 400} &amp;lt; {a: 400, b: MinKey&lt;/tt&gt;}&lt;/a&gt;, if shard-rs1 happens to own that range then it&apos;ll refuse to perform the range deletion for {&lt;tt&gt;a: 400, b: MinKey} &amp;#45;&amp;gt; {a: MaxKey, b: MaxKey&lt;/tt&gt;}.&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="1183260">SERVER-46386</key>
            <summary>Refining a shard key may lead to an orphan range never being cleaned up</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="matthew.saltz@mongodb.com">Matthew Saltz</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                    </labels>
                <created>Tue, 25 Feb 2020 05:04:10 +0000</created>
                <updated>Sun, 29 Oct 2023 22:11:45 +0000</updated>
                            <resolved>Fri, 13 Mar 2020 17:07:07 +0000</resolved>
                                                    <fixVersion>4.4.0-rc0</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="3013531" author="xgen-internal-githook" created="Mon, 30 Mar 2020 18:20:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Saltz&apos;, &apos;email&apos;: &apos;matthew.saltz@mongodb.com&apos;, &apos;username&apos;: &apos;saltzm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46386&quot; title=&quot;Refining a shard key may lead to an orphan range never being cleaned up&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46386&quot;&gt;&lt;del&gt;SERVER-46386&lt;/del&gt;&lt;/a&gt; Change MetadataManager::_findNewestOverlappingMetadata to work with refined shard keys&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 46b4b3d8f03e3dfc3ca2ae344bf7848732e986c3)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/810b50de5ae4a21d91aaf0f644dd4be0e60ba592&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/810b50de5ae4a21d91aaf0f644dd4be0e60ba592&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2979038" author="xgen-internal-githook" created="Fri, 13 Mar 2020 17:05:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;saltzm&apos;, &apos;name&apos;: &apos;Matthew Saltz&apos;, &apos;email&apos;: &apos;matthew.saltz@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46386&quot; title=&quot;Refining a shard key may lead to an orphan range never being cleaned up&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46386&quot;&gt;&lt;del&gt;SERVER-46386&lt;/del&gt;&lt;/a&gt; Change MetadataManager::_findNewestOverlappingMetadata to work with refined shard keys&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/46b4b3d8f03e3dfc3ca2ae344bf7848732e986c3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/46b4b3d8f03e3dfc3ca2ae344bf7848732e986c3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2906552" author="max.hirschhorn@10gen.com" created="Tue, 25 Feb 2020 05:11:17 +0000"  >&lt;p&gt;It is unknown to me if there may be other situations where &lt;tt&gt;ChunkManager::rangeOverlapsShard()&lt;/tt&gt; or &lt;tt&gt;RoutingTableHistory::overlappingRanges()&lt;/tt&gt; are called with a &lt;tt&gt;ChunkRange&lt;/tt&gt; that has a shape from prior to the refinement of the shard key. I&apos;d imagine those to be similarly problematic if there are any such places.&lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="1350296">SERVER-48198</issuekey>
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                                        <issuelink>
            <issuekey id="1182123">SERVER-46370</issuekey>
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            <issuelink>
            <issuekey id="854459">SERVER-42192</issuekey>
        </issuelink>
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                            <attachment id="248850" name="server42192.patch" size="29559" author="max.hirschhorn@mongodb.com" created="Tue, 25 Feb 2020 05:02:38 +0000"/>
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                            <customfieldvalue>&lt;p&gt;Apply &lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/248850/248850_server42192.patch&quot; title=&quot;server42192.patch attached to SERVER-46386&quot;&gt;server42192.patch&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt; to allow the &lt;tt&gt;moveChunk&lt;/tt&gt; command to be automatically retried in the presence of failovers and run the &lt;tt&gt;random_moveChunk_refine_collection_shard_key.js&lt;/tt&gt; FSM workload. The &lt;tt&gt;&amp;#45;&amp;#45;repeat&lt;/tt&gt; is necessary because while this concurrency test reproduces the issue often, it doesn&apos;t happen every time.&lt;/p&gt;

&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;python buildscripts/resmoke.py --suite=concurrency_sharded_multi_stmt_txn_terminate_primary jstests/concurrency/fsm_workloads/random_moveChunk_refine_collection_shard_key.js --repeat=10&lt;/span&gt;&lt;/pre&gt;
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