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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>[DOCS-16159] Investigate changes in SERVER-72146: Make chunk migrations metrics more accessible from Atlas</title>
                <link>https://jira.mongodb.org/browse/DOCS-16159</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Original Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;    After this commits in all LTS versions of mongo the following &lt;a href=&quot;https://www.mongodb.com/docs/v6.0/reference/command/serverStatus/#shardingstatistics&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;sharding statistics&lt;/a&gt; are now available through &lt;tt&gt;serverStatus&lt;/tt&gt;:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;&lt;tt&gt;countDocsClonedOnCatchUpOnRecipient&lt;/tt&gt;: the number of documents cloned during the catch up phase of the migration&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;countBytesClonedOnCatchUpOnRecipient&lt;/tt&gt;: the number of bytes cloned during the catch up phase of the migration&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;countBytesClonedOnRecipient&lt;/tt&gt;: the number of bytes cloned by the recipient of a migration&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;countDonorMoveChunkCommitted&lt;/tt&gt;: the total number of migrations committed by the node&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;countDonorMoveChunkAborted&lt;/tt&gt;: the number of migrations aborted in the node&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;totalDonorMoveChunkTimeMillis&lt;/tt&gt;: the total amount of time a migration took from beginning to end&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;totalRecipientCriticalSectionTimeMillis&lt;/tt&gt;: the amount of time in milliseconds the recipient of a migration spent holding the critical section
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    Often, when investigating HELP tickets related to balancing, we need to access and combine data from FTDC, logs and configdump to figure some basic metrics such as:&lt;/p&gt;&lt;/li&gt;
&lt;/ul&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Migration throughput (how fast is this shard cloning data)&lt;/li&gt;
	&lt;li&gt;Range deleter throughout (how fast is this shard executing its range deletions)&lt;/li&gt;
	&lt;li&gt;Number of orphans documents (how many orphans documents are waiting to be deleted)&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The following statistics should be available on serverStatus under the shardingStatistics group:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;&lt;tt&gt;countDocsClonedOnCatchUpOnRecipient&lt;/tt&gt;: the number of documents cloned during the catch up phase of the migration&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;countBytesClonedOnCatchUpOnRecipient&lt;/tt&gt;: the number of bytes cloned during the catch up phase of the migration&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;countBytesClonedOnRecipient&lt;/tt&gt;: the number of bytes cloned by the recipient of a migration&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;countDonorMoveChunkCommitted&lt;/tt&gt;: the total number of migrations committed by the node&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;countDonorMoveChunkAborted&lt;/tt&gt;: the number of migrations aborted in the node&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;totalDonorMoveChunkTimeMillis&lt;/tt&gt;: the total amount of time a migration took from beginning to end&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;totalRecipientCriticalSectionTimeMillis&lt;/tt&gt;: the amount of time in milliseconds the recipient of a migration spent holding the critical section&lt;/li&gt;
&lt;/ul&gt;

</description>
                <environment></environment>
        <key id="2349302">DOCS-16159</key>
            <summary>Investigate changes in SERVER-72146: Make chunk migrations metrics more accessible from Atlas</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="9">Done</resolution>
                                        <assignee username="jason.price@mongodb.com">Jason Price</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Wed, 24 May 2023 14:21:47 +0000</created>
                <updated>Mon, 13 Nov 2023 17:31:46 +0000</updated>
                            <resolved>Wed, 12 Jul 2023 23:44:36 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                    <fixVersion>6.0.6</fixVersion>
                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>5.0.18</fixVersion>
                    <fixVersion>6.3.2</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5448882" author="JIRAUSER1257151" created="Wed, 24 May 2023 14:52:25 +0000"  >&lt;p&gt;Note to the docs owner on the server side: If this will have impact on the Atlas side, please file a clone DOCSP. Thank you!&lt;/p&gt;</comment>
                    </comments>
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                            <issuelinktype id="10320">
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                            <customfieldvalue>After this commits in all LTS versions of mongo the following sharding statistics are now available through serverStatus:&lt;br/&gt;
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* countDocsClonedOnCatchUpOnRecipient: the number of documents cloned during the catch up phase of the migration&lt;br/&gt;
* countBytesClonedOnCatchUpOnRecipient: the number of bytes cloned during the catch up phase of the migration&lt;br/&gt;
* countBytesClonedOnRecipient: the number of bytes cloned by the recipient of a migration&lt;br/&gt;
* countDonorMoveChunkCommitted: the total number of migrations committed by the node&lt;br/&gt;
* countDonorMoveChunkAborted: the number of migrations aborted in the node&lt;br/&gt;
* totalDonorMoveChunkTimeMillis: the total amount of time a migration took from beginning to end&lt;br/&gt;
* totalRecipientCriticalSectionTimeMillis: the amount of time in milliseconds the recipient of a migration spent holding the critical section</customfieldvalue>

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