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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-43846] Add way to track the number of failovers that would have caused orphaned documents</title>
                <link>https://jira.mongodb.org/browse/SERVER-43846</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In order to validate the efficacy/helpfulness of the resumable range deleter project, it would be good to have a way to track statistics on when the resumability aspect of the range deleter is helpful. One way to do this would be to track on step up whether or not there were outstanding range deleter tasks - since these are tasks that would have led to orphaned documents had there not been a resumable range deleter.&lt;/p&gt;</description>
                <environment></environment>
        <key id="960103">SERVER-43846</key>
            <summary>Add way to track the number of failovers that would have caused orphaned documents</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="matthew.saltz@mongodb.com">Matthew Saltz</reporter>
                        <labels>
                    </labels>
                <created>Fri, 4 Oct 2019 19:52:54 +0000</created>
                <updated>Sun, 29 Oct 2023 22:16:24 +0000</updated>
                            <resolved>Tue, 3 Mar 2020 17:59:55 +0000</resolved>
                                                    <fixVersion>4.3.5</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2932628" author="xgen-internal-githook" created="Tue, 3 Mar 2020 17:34:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;renctan&apos;, &apos;name&apos;: &apos;Randolph Tan&apos;, &apos;email&apos;: &apos;randolph@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43846&quot; title=&quot;Add way to track the number of failovers that would have caused orphaned documents&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43846&quot;&gt;&lt;del&gt;SERVER-43846&lt;/del&gt;&lt;/a&gt; Add information about how many migration task were leftover from last primary&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a68774045ce42d55e82236408bd9cf004c54d12a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a68774045ce42d55e82236408bd9cf004c54d12a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2889625" author="garaudy.etienne" created="Fri, 21 Feb 2020 21:16:26 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=renctan&quot; class=&quot;user-hover&quot; rel=&quot;renctan&quot;&gt;renctan&lt;/a&gt;&#160;I agree with displaying 0 over blank. Understood for the rest!!&#160;&lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/thumbs_up.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</comment>
                            <comment id="2889528" author="renctan" created="Fri, 21 Feb 2020 21:14:27 +0000"  >&lt;blockquote&gt;
&lt;p&gt;If there are no orphans, is the number 0 or blank?&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=garaudy.etienne&quot; class=&quot;user-hover&quot; rel=&quot;garaudy.etienne&quot;&gt;garaudy.etienne&lt;/a&gt;, I&apos;m thinking displaying zero over blank. Note that if the number is non-zero, it doesn&apos;t mean that there are orphans. It means that there were potentially orphans during the time this mongod transitioned to primary. Before the project, this would mean that the mongod could have orphans, after the project, if there were orphans, they will eventually (strong emphasis on &quot;eventually&quot;) be cleaned up.&lt;/p&gt;</comment>
                            <comment id="2889513" author="garaudy.etienne" created="Fri, 21 Feb 2020 21:08:38 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=renctan&quot; class=&quot;user-hover&quot; rel=&quot;renctan&quot;&gt;renctan&lt;/a&gt; Looks good to me? If there are no orphans, is the number 0 or blank?&lt;/p&gt;</comment>
                            <comment id="2889510" author="renctan" created="Fri, 21 Feb 2020 21:06:48 +0000"  >&lt;p&gt;Proposed format:&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;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;shardingStatistics: { // this is an existing field&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;  unfinishedMigrationfromPreviousPrimary: &amp;lt;number&amp;gt;&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;   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;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sheeri.cabral&quot; class=&quot;user-hover&quot; rel=&quot;sheeri.cabral&quot;&gt;sheeri.cabral&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=garaudy.etienne&quot; class=&quot;user-hover&quot; rel=&quot;garaudy.etienne&quot;&gt;garaudy.etienne&lt;/a&gt; Does the format look good to you? Any non-zero number would be an indication that it would have left orphans before the project.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=matthew.saltz&quot; class=&quot;user-hover&quot; rel=&quot;matthew.saltz&quot;&gt;matthew.saltz&lt;/a&gt;, I chose to use the number of migrationCoordinators documents instead since we are already iterating over them during transition to primary. This will make the accounting easier to reason about as well, as you won&apos;t need to think whether the range delete is destination or source and whether you are double counting the total across the entire cluster. What do you think?&lt;/p&gt;</comment>
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            <issuekey id="1268614">DOCS-13511</issuekey>
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                            <customfieldvalue>*mongod shards only*&lt;br/&gt;
&lt;br/&gt;
Not sure worth documenting. This new field doesn&amp;#39;t have real purpose than for the products team to validate that the Range Deleter helps.&lt;br/&gt;
&lt;br/&gt;
New field in shardingStatistics called unfinishedMigrationFromPreviousPrimary, which contains the number of unfinished migrations left by previous primary.</customfieldvalue>

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