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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-56339] Traceability Between mongos and mongod Cursors</title>
                <link>https://jira.mongodb.org/browse/SERVER-56339</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi Team,&lt;/p&gt;

&lt;p&gt;Currently, when issuing queries against a Sharded Cluster (v4.0.x, v4.2.x, and v4.4.x) there are different cursor ids participating in the operation:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;The cursor id opened against the &lt;em&gt;mongos&lt;/em&gt;.&lt;/li&gt;
	&lt;li&gt;The cursor ids that the &lt;em&gt;mongos&lt;/em&gt; opens against each of the corresponding &lt;em&gt;mongods&lt;/em&gt; that must participate in the query.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;When looking at the MongoDB Logs for a specific query, the operation that&apos;s started in the &lt;em&gt;mongos&lt;/em&gt; can be tied to the &lt;em&gt;mongods&lt;/em&gt; using the &lt;em&gt;lsid&lt;/em&gt; but one &lt;em&gt;lsid&lt;/em&gt; can potentially work with more than one cursor id during its lifespan. For troubleshooting purposes, it would be useful to be able to also tie cursor ids (1) and (2) for a given operation.&lt;/p&gt;

&lt;p&gt;Since logging the downstream cursor ids that are opened against each Shard in the &lt;em&gt;mongos&lt;/em&gt; logs can potentially result in large log entries for big Sharded Clusters, I believe the &lt;em&gt;mongods&lt;/em&gt; participating in the query could log the cursor id from the &lt;em&gt;mongos&lt;/em&gt; as part of the &lt;em&gt;$client&lt;/em&gt; details, for example:&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;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; $client: { &lt;/span&gt;&lt;/pre&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;   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;     application: { name: &quot;MongoDB Shell&quot; }, &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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;     driver: { name: &quot;MongoDB Internal Client&quot;, version: &quot;4.2.13&quot; }, &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;     os: { type: &quot;Linux&quot;, name: &quot;Ubuntu&quot;, architecture: &quot;x86_64&quot;, version: &quot;20.04&quot; }, &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;     mongos: { host: &quot;hostname:27017&quot;, client: &quot;127.0.0.1:43120&quot;, version: &quot;4.2.13&quot;, cursorid: 4622046380930068847 }&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;     }&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 based on the assumption that a logged &quot;slow&quot; operation in a &lt;em&gt;mongod&lt;/em&gt; that&apos;s tied to a &lt;em&gt;mongos&lt;/em&gt; request is going to result in a &quot;slow&quot; operation logged in the corresponding &lt;em&gt;mongos&lt;/em&gt; so both components will have the required troubleshooting information. Please correct me if there might be some edge case where this won&apos;t happen.&lt;/p&gt;

&lt;p&gt;Would it be possible to incorporate this information in the &quot;slow&quot; query logs?&lt;/p&gt;

&lt;p&gt;Regards&lt;br/&gt;
Diego&lt;/p&gt;</description>
                <environment></environment>
        <key id="1691128">SERVER-56339</key>
            <summary>Traceability Between mongos and mongod Cursors</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="diego.rodriguez@mongodb.com">Diego Rodriguez</reporter>
                        <labels>
                            <label>query</label>
                            <label>sharding</label>
                    </labels>
                <created>Mon, 26 Apr 2021 00:29:27 +0000</created>
                <updated>Tue, 14 Feb 2023 15:50:38 +0000</updated>
                                            <version>4.2.13</version>
                    <version>4.4.5</version>
                    <version>4.0.24</version>
                                                    <component>Logging</component>
                                        <votes>1</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="3746570" author="kyle.suarez" created="Thu, 29 Apr 2021 14:28:20 +0000"  >&lt;p&gt;Adding this for consideration to the Query Execution backlog, and potentially considering opening an Epic to track this.&lt;/p&gt;</comment>
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