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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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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-44891] collStats will fail if resulting BSON size &gt; 16MB</title>
                <link>https://jira.mongodb.org/browse/SERVER-44891</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Given a larger (50+) sharded cluster with a collection with a larger (45+) number of indexes, when running the &lt;tt&gt;collStats&lt;/tt&gt; command the result will be a failure due to exceeding the internal BSON document size limit:&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;See &lt;a href=&quot;https://gist.github.com/alexbevi/dc51c0ce4820f46e46feca06dbdc64bb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://gist.github.com/alexbevi/dc51c0ce4820f46e46feca06dbdc64bb&lt;/a&gt; for reproduction details. Issue appears to originate at &lt;a href=&quot;https://github.com/mongodb/mongo/blob/81238fa87afbe52a9658547f63c79fac126862f1/src/mongo/s/commands/cluster_coll_stats_cmd.cpp#L207&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/81238fa87afbe52a9658547f63c79fac126862f1/src/mongo/s/commands/cluster_coll_stats_cmd.cpp#L207&lt;/a&gt; where the &lt;tt&gt;shard&lt;/tt&gt; results are objectified.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1030389">SERVER-44891</key>
            <summary>collStats will fail if resulting BSON size &gt; 16MB</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="charlie.swanson@mongodb.com">Charlie Swanson</assignee>
                                    <reporter username="alex.bevilacqua@mongodb.com">Alex Bevilacqua</reporter>
                        <labels>
                    </labels>
                <created>Mon, 2 Dec 2019 10:32:15 +0000</created>
                <updated>Mon, 23 Oct 2023 21:14:35 +0000</updated>
                            <resolved>Fri, 20 Dec 2019 19:30:54 +0000</resolved>
                                                                    <component>Sharding</component>
                    <component>Shell</component>
                                        <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="2702896" author="charlie.swanson" created="Fri, 3 Jan 2020 18:31:04 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alex.bevilacqua&quot; class=&quot;user-hover&quot; rel=&quot;alex.bevilacqua&quot;&gt;alex.bevilacqua&lt;/a&gt; I filed &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13326&quot; title=&quot;Suggest using $collStats as an alternative on the collStats command page&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13326&quot;&gt;&lt;del&gt;DOCS-13326&lt;/del&gt;&lt;/a&gt;!&lt;/p&gt;</comment>
                            <comment id="2658501" author="charlie.swanson" created="Fri, 20 Dec 2019 19:30:54 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alex.bevilacqua&quot; class=&quot;user-hover&quot; rel=&quot;alex.bevilacqua&quot;&gt;alex.bevilacqua&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;This is indeed unfortunate behavior but I believe you will be able to work around it by using the &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/aggregation/collStats/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;$collStats stage&lt;/a&gt; which will provide a cursor. I&apos;m closing this as &quot;Won&apos;t Fix&quot; as we don&apos;t plan on maintaining the collStats command much anymore, but please re-open if there&apos;s some reason the agg stage won&apos;t work for this use case. I will also link this as related to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33435&quot; title=&quot;Remove the collstats command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33435&quot;&gt;SERVER-33435&lt;/a&gt;. &lt;/p&gt;</comment>
                            <comment id="2574728" author="carl.champain" created="Mon, 2 Dec 2019 16:29:46 +0000"  >&lt;p&gt;Passing this ticket along to the Sharding team.&lt;/p&gt;</comment>
                            <comment id="2574216" author="alex.bevilacqua" created="Mon, 2 Dec 2019 10:45:50 +0000"  >&lt;p&gt;A solution to this could be to accept an optional param for &lt;tt&gt;collStats&lt;/tt&gt; (maybe &lt;tt&gt;unwindShards: true&lt;/tt&gt;) which would return an array instead of a document. If this option were set, when the &lt;tt&gt;shardResults&lt;/tt&gt; were being iterated (see &lt;a href=&quot;https://github.com/mongodb/mongo/blob/81238fa87afbe52a9658547f63c79fac126862f1/src/mongo/s/commands/cluster_coll_stats_cmd.cpp#L108&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/81238fa87afbe52a9658547f63c79fac126862f1/src/mongo/s/commands/cluster_coll_stats_cmd.cpp#L108&lt;/a&gt;) instead of appending them to a single result object, they could be pushed to an array.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="2338269">SERVER-77038</issuekey>
        </issuelink>
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                                    </issuelinktype>
                            <issuelinktype id="10520">
                    <name>Problem/Incident</name>
                                            <outwardlinks description="causes">
                                        <issuelink>
            <issuekey id="1030393">SERVER-44892</issuekey>
        </issuelink>
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                                                        </issuelinktype>
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            <issuekey id="500877">SERVER-33435</issuekey>
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            <issuelink>
            <issuekey id="1075017">DOCS-13326</issuekey>
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="971421">SERVER-44051</issuekey>
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