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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-43617] Add metrics on the mongos to indicate the number of shards targeted for the commands (find, aggregate, etc)</title>
                <link>https://jira.mongodb.org/browse/SERVER-43617</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently the mongos collects the opcounter metrics etc, with which we can get an idea on the incoming operations to the mongos. The mongos dispatch the operations to the shards:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;If the operation only targets one shard, then the mongos only needs to dispatch it to one shard.&lt;/li&gt;
	&lt;li&gt;However, if the operation is a scatter-gather operation or targets a sub set of shards, then the mongos would need to dispatch the operation to multiple shards. In this case, the mongos is doing more work for such operation than the targeted operation, and there would be more load on the mongos.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Currently we have added a metric to indicate the amount of sharded updates done with only _id in query (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41184&quot; title=&quot;Add metrics to indicate the amount of sharded updates done with only _id in query&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41184&quot;&gt;&lt;del&gt;SERVER-41184&lt;/del&gt;&lt;/a&gt;). It would be nice to expose the number of shards targeted for the operations (find, aggregate, etc), so that we can have some insight on the number of outgoing operations from the mongos, to understand the (outgoing) workload  on the mongos.&lt;/p&gt;</description>
                <environment></environment>
        <key id="939410">SERVER-43617</key>
            <summary>Add metrics on the mongos to indicate the number of shards targeted for the commands (find, aggregate, etc)</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="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="13201">Fixed</resolution>
                                        <assignee username="janna.golden@mongodb.com">Janna Golden</assignee>
                                    <reporter username="linda.qin@mongodb.com">Linda Qin</reporter>
                        <labels>
                    </labels>
                <created>Wed, 25 Sep 2019 07:07:29 +0000</created>
                <updated>Mon, 8 Jan 2024 15:23:12 +0000</updated>
                            <resolved>Tue, 17 Dec 2019 18:18:21 +0000</resolved>
                                                    <fixVersion>4.3.3</fixVersion>
                    <fixVersion>4.0.25</fixVersion>
                    <fixVersion>4.2.15</fixVersion>
                                                        <votes>0</votes>
                                    <watches>16</watches>
                                                                                                                <comments>
                            <comment id="3874075" author="xgen-internal-githook" created="Fri, 11 Jun 2021 19:44:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Janna Golden&apos;, &apos;email&apos;: &apos;janna.golden@mongodb.com&apos;, &apos;username&apos;: &apos;jannaerin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43617&quot; title=&quot;Add metrics on the mongos to indicate the number of shards targeted for the commands (find, aggregate, etc)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43617&quot;&gt;&lt;del&gt;SERVER-43617&lt;/del&gt;&lt;/a&gt; Add metrics on the mongos to indicate the number of shards targeted for CRUD and agg commands&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 1fe9dfb1ade548488831bf29cdcc57636e5e3b8a)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c6533b269898f6cd077ffca7b2cc9545863313e9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c6533b269898f6cd077ffca7b2cc9545863313e9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3772757" author="xgen-internal-githook" created="Thu, 13 May 2021 20:50:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Janna Golden&apos;, &apos;email&apos;: &apos;janna.golden@mongodb.com&apos;, &apos;username&apos;: &apos;jannaerin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43617&quot; title=&quot;Add metrics on the mongos to indicate the number of shards targeted for the commands (find, aggregate, etc)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43617&quot;&gt;&lt;del&gt;SERVER-43617&lt;/del&gt;&lt;/a&gt; Add metrics on the mongos to indicate the number of shards targeted for CRUD and agg commands&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 1fe9dfb1ade548488831bf29cdcc57636e5e3b8a)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9aef163066b2d4197d328fb112307c40f840a541&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9aef163066b2d4197d328fb112307c40f840a541&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2653476" author="xgen-internal-githook" created="Thu, 19 Dec 2019 20:48:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Janna Golden&apos;, &apos;email&apos;: &apos;janna.golden@mongodb.com&apos;, &apos;username&apos;: &apos;jannaerin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43617&quot; title=&quot;Add metrics on the mongos to indicate the number of shards targeted for the commands (find, aggregate, etc)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43617&quot;&gt;&lt;del&gt;SERVER-43617&lt;/del&gt;&lt;/a&gt; Add tag to num_hosts_targeted_metrics.js&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/54ed086026aba498ae9d51a0fd5094cc5acf1852&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/54ed086026aba498ae9d51a0fd5094cc5acf1852&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2637149" author="xgen-internal-githook" created="Tue, 17 Dec 2019 16:41:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Janna Golden&apos;, &apos;email&apos;: &apos;janna.golden@mongodb.com&apos;, &apos;username&apos;: &apos;jannaerin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43617&quot; title=&quot;Add metrics on the mongos to indicate the number of shards targeted for the commands (find, aggregate, etc)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43617&quot;&gt;&lt;del&gt;SERVER-43617&lt;/del&gt;&lt;/a&gt; Add metrics on the mongos to indicate the number of shards targeted for CRUD and agg commands&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1fe9dfb1ade548488831bf29cdcc57636e5e3b8a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1fe9dfb1ade548488831bf29cdcc57636e5e3b8a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2499664" author="bruce.lucas@10gen.com" created="Thu, 24 Oct 2019 18:19:51 +0000"  >&lt;p&gt;I agree that it&apos;s good to have more data to pinpoint the offending queries, but we also have to think about the impact on ftdc. This takes two forms: volume of data, and schema changes (which drastically impact compression). We should take a look at any design from that perspective.&lt;/p&gt;</comment>
                            <comment id="2499578" author="sheeri.cabral" created="Thu, 24 Oct 2019 17:30:52 +0000"  >&lt;p&gt;SGTM: &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=linda.qin&quot; class=&quot;user-hover&quot; rel=&quot;linda.qin&quot;&gt;linda.qin&lt;/a&gt; what do you think?&lt;/p&gt;</comment>
                            <comment id="2498238" author="sheeri.cabral" created="Wed, 23 Oct 2019 20:51:44 +0000"  >&lt;p&gt;In order to be meaningful, there would need to be some correlation between number of shards targeted and type of query. e.g. in the case specified, correlating &quot;distinct&quot; with multiple shard targets (and in &lt;a href=&quot;https://jira.mongodb.org/browse/HELP-11396?focusedCommentId=2431468&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-2431468&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;this specific comment on HELP-11396&lt;/a&gt;, correlating aggregate, distinct and find (actually &quot;each operation&quot;) with target # of shards.&lt;/p&gt;

&lt;p&gt;I feel like if we just had &quot;# shards vs. # of requests&quot;, customers (and we) would be able to deduce that there&apos;s a bunch of expensive queries targeting multiple shards, but we wouldn&apos;t be able to pinpoint which ones. Having &quot;# shards targeted vs. # of requests for operation X&quot; would be able to show us if operation X often targets one shard or many shards. It still doesn&apos;t pinpoint a specific query, but it seems better than just total requests on the mongos vs. total requests on the shards (so if shard requests are 2x mongos requests, we know that on average a query goes to 2 shards).&lt;/p&gt;</comment>
                            <comment id="2432818" author="bruce.lucas@10gen.com" created="Wed, 25 Sep 2019 14:26:12 +0000"  >&lt;p&gt;Would it suffice to report the total number of requests dispatched to shards? This can be compared to the total number of requests processed to get an idea how much the node is being impacted by multi-target queries in the aggregate.&lt;/p&gt;</comment>
                    </comments>
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                            <customfieldvalue>A new field &amp;#39;shardingStatistics.numHostsTargeted&amp;#39; was added to the output of the serverStatus command in order to indicate the number of shards targeted for CRUD ops and the aggregation command. Each time either a CRUD op or agg command is run, these metrics are incremented. The new field looks like:&lt;br/&gt;
&lt;br/&gt;
{code}&lt;br/&gt;
&amp;quot;numHostsTargeted&amp;quot; : {&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;find&amp;quot; : {&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;allShards&amp;quot; : NumberLong(&amp;lt;num&amp;gt;),&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;manyShards&amp;quot; : NumberLong(&amp;lt;num&amp;gt;),&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;oneShard&amp;quot; : NumberLong(&amp;lt;num&amp;gt;),&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;unsharded&amp;quot; : NumberLong(&amp;lt;num&amp;gt;)&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;},&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;insert&amp;quot; : {&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;allShards&amp;quot; : NumberLong(&amp;lt;num&amp;gt;),&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;manyShards&amp;quot; : NumberLong(&amp;lt;num&amp;gt;),&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;oneShard&amp;quot; : NumberLong(&amp;lt;num&amp;gt;),&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;unsharded&amp;quot; : NumberLong(&amp;lt;num&amp;gt;)&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;},&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;update&amp;quot; : {&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;allShards&amp;quot; : NumberLong(&amp;lt;num&amp;gt;),&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;manyShards&amp;quot; : NumberLong(&amp;lt;num&amp;gt;),&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;oneShard&amp;quot; : NumberLong(&amp;lt;num&amp;gt;),&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;unsharded&amp;quot; : NumberLong(&amp;lt;num&amp;gt;)&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;},&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;delete&amp;quot; : {&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;allShards&amp;quot; : NumberLong(&amp;lt;num&amp;gt;),&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;manyShards&amp;quot; : NumberLong(&amp;lt;num&amp;gt;),&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;oneShard&amp;quot; : NumberLong(&amp;lt;num&amp;gt;),&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;unsharded&amp;quot; : NumberLong(&amp;lt;num&amp;gt;)&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;},&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;aggregate&amp;quot; : {&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;allShards&amp;quot; : NumberLong(&amp;lt;num&amp;gt;),&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;manyShards&amp;quot; : NumberLong(&amp;lt;num&amp;gt;),&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;oneShard&amp;quot; : NumberLong(&amp;lt;num&amp;gt;),&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;unsharded&amp;quot; : NumberLong(&amp;lt;num&amp;gt;)&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;},&lt;br/&gt;
}&lt;br/&gt;
{code}&lt;br/&gt;
&lt;br/&gt;
allShards - all shards were targeted for a command&lt;br/&gt;
manyShards - more than one shard was targeted for a command&lt;br/&gt;
oneShard - only one shard was targeted for a command&lt;br/&gt;
unsharded - the collection the command was run on is unsharded</customfieldvalue>

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