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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-30025] for sharded read with empty query, target only shards that own data for the collection instead of all shards</title>
                <link>https://jira.mongodb.org/browse/SERVER-30025</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We should fix the regression introduced by the scatterGather interface where, in the absence of a passed-in query, currently &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.9/src/mongo/s/commands/cluster_commands_helpers.cpp#L108&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;all shards are targeted&lt;/a&gt; for requests on sharded collections.&lt;/p&gt;

&lt;p&gt;Instead, scatterGather() should be changed to only target shards that actually own data for the collection by assuming an empty query and using &lt;tt&gt;ChunkManager::getShardIdsForQuery&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;In addition, the following commands should be changed to be broadcast and unversioned:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;createIndexes&lt;/li&gt;
	&lt;li&gt;dropIndex&lt;/li&gt;
	&lt;li&gt;reIndex&lt;/li&gt;
	&lt;li&gt;collMod&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="401216">SERVER-30025</key>
            <summary>for sharded read with empty query, target only shards that own data for the collection instead of all shards</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="13201">Fixed</resolution>
                                        <assignee username="esha.maharishi@mongodb.com">Esha Maharishi</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Thu, 6 Jul 2017 17:59:53 +0000</created>
                <updated>Mon, 30 Oct 2023 23:15:26 +0000</updated>
                            <resolved>Tue, 26 Sep 2017 17:11:30 +0000</resolved>
                                    <version>3.5.9</version>
                                    <fixVersion>3.6.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1682199" author="xgen-internal-githook" created="Tue, 26 Sep 2017 17:07:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;esha.maharishi@mongodb.com&apos;, &apos;name&apos;: &apos;Esha Maharishi&apos;, &apos;username&apos;: &apos;EshaMaharishi&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30025&quot; title=&quot;for sharded read with empty query, target only shards that own data for the collection instead of all shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30025&quot;&gt;&lt;del&gt;SERVER-30025&lt;/del&gt;&lt;/a&gt; for sharded read with empty query, target only shards that own data for the collection instead of all shards&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/dabde5a17356591ebcb465129bcd5ed5d9236b60&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/dabde5a17356591ebcb465129bcd5ed5d9236b60&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1642882" author="esha.maharishi@10gen.com" created="Tue, 8 Aug 2017 13:06:16 +0000"  >&lt;p&gt;Marked as &quot;related to&quot; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30344&quot; title=&quot;prevent shards from implicitly creating a collection on createIndexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30344&quot;&gt;&lt;del&gt;SERVER-30344&lt;/del&gt;&lt;/a&gt; because this ticket is to fix a regression introduced in 3.5.x where we target all shards in cases where we shouldn&apos;t. However, createIndexes currently &lt;em&gt;depends&lt;/em&gt; on targeting all shards. But creating an index on all shards is actually incorrect, because it causes the collection to implicitly be created without the right collection options (including UUID) on shards that don&apos;t own data for the collection yet.&lt;/p&gt;</comment>
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            <issuekey id="431172">SERVER-31232</issuekey>
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            <issuekey id="391628">SERVER-29514</issuekey>
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