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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-74842] `collStats` must never return a negative number of orphans</title>
                <link>https://jira.mongodb.org/browse/SERVER-74842</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://github.com/10gen/mongo/blob/dbf58f2acbb9872ec22815fe6ae72dcdd0eda204/src/mongo/db/s/balancer_stats_registry.h#L65&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;BalancerStatsRegistry is a ReplicaSetAwareService&lt;/a&gt; so it is only up on primaries; when asking to a secondary the number of orphans, &lt;a href=&quot;https://github.com/10gen/mongo/blob/dbf58f2acbb9872ec22815fe6ae72dcdd0eda204/src/mongo/db/s/balancer_stats_registry.cpp#L184-L212&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;they&apos;re retrieved by executing a local query&lt;/a&gt; bypassing &lt;a href=&quot;https://github.com/10gen/mongo/blob/dbf58f2acbb9872ec22815fe6ae72dcdd0eda204/src/mongo/db/s/balancer_stats_registry.cpp#L248&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the checks for non-negativity&lt;/a&gt; that are in place when the service is up on primary nodes.&lt;/p&gt;

&lt;p&gt;Purpose of this ticket is to return &lt;b&gt;0&lt;/b&gt; orphaned documents also from secondaries when the tracked number is negative.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Whycanthecounterbenegative%3F&quot;&gt;&lt;/a&gt;Why can the counter be negative?&lt;/h4&gt;

&lt;p&gt;When a migration is aborted, the counter of orphans tracked in the range deletion task document is missing the number of documents cloned in the last batch because the update (to perform &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b83e40d9508c662cbc75d363f83974b1efeb3f36/src/mongo/db/s/migration_batch_inserter.cpp#L159&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; or &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b83e40d9508c662cbc75d363f83974b1efeb3f36/src/mongo/db/s/migration_destination_manager.cpp#L1767&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;) is skipped due to the error triggering the abort.&lt;/p&gt;

&lt;p&gt;Since the range deletion is processed as follows, it may transiently happen to track on disk a negative number of orphaned docs:&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;
		&lt;tbody &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;  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;while (there are docs in the orphaned range)&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;-- Delete a batch&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;   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;-- Decrement the counter on disk (num orphans tracked on disk - num orphaned documents deleted)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;This is a self-recovering error that can happen on at most ONE range deletion document at a time. The error is automatically corrected once the range deleter finishes processing potential ranges with wrong counters. And it&apos;s quite a rare condition (hopefully there should never be so many aborts).&lt;/p&gt;</description>
                <environment></environment>
        <key id="2288052">SERVER-74842</key>
            <summary>`collStats` must never return a negative number of 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="silvia.surroca@mongodb.com">Silvia Surroca</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                    </labels>
                <created>Tue, 14 Mar 2023 17:40:29 +0000</created>
                <updated>Sun, 29 Oct 2023 21:24:56 +0000</updated>
                            <resolved>Fri, 17 Mar 2023 13:40:37 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5280331" author="xgen-internal-githook" created="Fri, 17 Mar 2023 13:39:44 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Silvia Surroca&apos;, &apos;email&apos;: &apos;silvia.surroca@mongodb.com&apos;, &apos;username&apos;: &apos;silviasuhu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74842&quot; title=&quot;`collStats` must never return a negative number of orphans&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74842&quot;&gt;&lt;del&gt;SERVER-74842&lt;/del&gt;&lt;/a&gt; collStats must never return a negative number of orphans&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/31ac033632994d23b081fd40691f9854150c871c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/31ac033632994d23b081fd40691f9854150c871c&lt;/a&gt;&lt;/p&gt;</comment>
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