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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-64660] Report in serverStatus number of file descriptors used by the query system outside of the storage engine</title>
                <link>https://jira.mongodb.org/browse/SERVER-64660</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, nodes can reach a &quot;too many open files&quot; state with a low number of connections and low wiredTiger data handle usage. Reporting file descriptors used by the aggregation framework will help close a diagnostic gap in file descriptor use.&lt;/p&gt;

&lt;p&gt;Ideally, record this as two counters:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;file handles opened&lt;/li&gt;
	&lt;li&gt;file handles closed&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2004789">SERVER-64660</key>
            <summary>Report in serverStatus number of file descriptors used by the query system outside of the storage engine</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="eric.sedor@mongodb.com">Eric Sedor</reporter>
                        <labels>
                            <label>query-offsite</label>
                    </labels>
                <created>Fri, 18 Mar 2022 20:13:31 +0000</created>
                <updated>Tue, 30 Jan 2024 15:22:38 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="4469063" author="eric.sedor" created="Fri, 8 Apr 2022 21:12:04 +0000"  >&lt;p&gt;Since a large number of aggregations could occur concurrently, I think counters are warranted here; added to the description. This is about any use of file descriptors by the aggregation framework. I&apos;m not certain all that use is (or will be) through the external sorter, so I&apos;m trying not to be over-specific.&lt;/p&gt;</comment>
                            <comment id="4429389" author="bruce.lucas@10gen.com" created="Wed, 23 Mar 2022 14:04:17 +0000"  >&lt;p&gt;What is the specific request - to report the current number of file descriptors currently in use across all aggregations currently running at the point where serverStatus is called? This would be useful in FTDC if the offending aggregations take substantially more than 1 second, which I think is likely to be the case, especially for an aggregation that uses a large number of files.&lt;/p&gt;

&lt;p&gt;Also, is this really about aggregations, or is it about file usage by anything that uses the external sorter?&lt;/p&gt;</comment>
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