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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>
    </build-info>


<item>
            <title>[SERVER-72802] Reduce collStats logging for unexpected fields</title>
                <link>https://jira.mongodb.org/browse/SERVER-72802</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently the mongos when executes collStats, parse and aggregate the replies from all the shards and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/41c3c56600afa40635a8d9703ed3833fd990e19b/src/mongo/s/commands/cluster_coll_stats_cmd.cpp#L339-L342&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;emits a log line every time it encounters a field not mentioned in the aggregation loop&lt;/a&gt;. &lt;br/&gt;
Emitting a log line is not useful at all and cause more harm than good:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;It doesn&apos;t help developers remembering to update the mongos aggregation loop when they add a new metric to collStats. If all tests pass then developers will simply commit their new code.&lt;/li&gt;
	&lt;li&gt;For customer with production cluster is completely useless to know that we forgot to update the metrics aggregation loop on the mongos.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Either we decide to make this check more strict (invariant/tassert) and force developers to always update the metrics aggregation loop on the mongos or we keep the current semantics but we log only at debug level so that it won&apos;t be visible in production.&lt;/p&gt;

&lt;p&gt;Also if we decide to keep the log, we should emit a single log line with a list of missing fields and not one line per fields.&lt;/p&gt;

&lt;p&gt;Currently (&lt;tt&gt;r6.3.0-alpha-1041-g541ba52e793&lt;/tt&gt; this is the list of missing fields:&lt;/p&gt;

&lt;p/&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;freeStorageSize&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;inMemory&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;indexBuilds&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;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&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;   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;$configTime&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$topologyTime&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&lt;/td&gt;
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&lt;p/&gt;


&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2231946">SERVER-72802</key>
            <summary>Reduce collStats logging for unexpected fields</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="pol.pinol@mongodb.com">Pol Pinol</assignee>
                                    <reporter username="tommaso.tocci@mongodb.com">Tommaso Tocci</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Thu, 12 Jan 2023 20:18:31 +0000</created>
                <updated>Mon, 27 Feb 2023 10:13:45 +0000</updated>
                            <resolved>Wed, 22 Feb 2023 08:08:27 +0000</resolved>
                                                                                        <votes>1</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5215645" author="pierlauro.sciarelli" created="Tue, 21 Feb 2023 09:46:15 +0000"  >&lt;p&gt;Agreed with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=pol.pinol%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;pol.pinol@mongodb.com&quot;&gt;pol.pinol@mongodb.com&lt;/a&gt; to repurpose this ticket with the objective of reviewing all fields not currently considered by the router command (returned by shards but not by routers) and decide what to do with them:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;EITHER create an cumulative output (for example, currently we return count that is the sum of the count returned from each shard)&lt;/li&gt;
	&lt;li&gt;OR return them shard by shard (e.g. it makes no sense to return a cumulative output of &lt;tt&gt;numOrphanDocs&lt;/tt&gt;, better returning something like &lt;font color=&quot;#C1C7D0&quot;&gt;numOrpanDocs: {shard0: 30, shard1: 100}&lt;/font&gt; )&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Then create a regression test that will take care of:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Call &lt;tt&gt;collStats&lt;/tt&gt; for a collection on the router&lt;/li&gt;
	&lt;li&gt;Call &lt;tt&gt;collStats&lt;/tt&gt; for the same collection directly on each shard&lt;/li&gt;
	&lt;li&gt;Make sure that the router returned all fields&lt;/li&gt;
&lt;/ul&gt;
</comment>
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