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    <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-73620] Report in serverStatus the amount of data written to disk by query system</title>
                <link>https://jira.mongodb.org/browse/SERVER-73620</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently if there is heavy disk usage by the server, there is no easy way to track if the IO is being caused by write operations or if a query is consuming the disk. Similar to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64660&quot; title=&quot;Report in serverStatus number of file descriptors used by the query system outside of the storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64660&quot;&gt;SERVER-64660&lt;/a&gt;, we should also track the amount of the data consumed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2253071">SERVER-73620</key>
            <summary>Report in serverStatus the amount of data written to disk by query system</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="arun.banala@mongodb.com">Arun Banala</reporter>
                        <labels>
                    </labels>
                <created>Sat, 4 Feb 2023 14:49:41 +0000</created>
                <updated>Tue, 28 Feb 2023 16:20:06 +0000</updated>
                                                                            <component>Diagnostics</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5237015" author="JIRAUSER1257467" created="Tue, 28 Feb 2023 16:20:06 +0000"  >&lt;p&gt;Sending it to backlog since we are not working on this for now&lt;/p&gt;</comment>
                            <comment id="5223782" author="john.murphy" created="Thu, 23 Feb 2023 05:20:51 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=arun.banala%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;arun.banala@mongodb.com&quot;&gt;arun.banala@mongodb.com&lt;/a&gt;&#160;&lt;/p&gt;

&lt;p&gt;We have WiredTiger metrics that show how much is read/written to cache, along with the raw block device metrics that show how much is actually read/written to disk.&lt;/p&gt;

&lt;p&gt;If my understanding is correct, the thing we don&apos;t have is how much disk IO is performed by the External Sorter when it spills to disk. I believe that if we had this data available to us, it would have been much easier to determine that the multi-planner was generating a high amount of sort operations that were spilling to disk and causing high disk utilisation.&lt;/p&gt;</comment>
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