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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-66474] Consider increasing number of shards in sharding passthrough suites</title>
                <link>https://jira.mongodb.org/browse/SERVER-66474</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;At the time of writing of this ticket, there are 38 sharding passthrough suites and only 24 of them are initializing more than 1 shard (by default &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5b63a432d152cafcd2e8479a28754c3d51d63baf/buildscripts/resmokelib/testing/fixtures/shardedcluster.py#L24&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;num_shard=1&lt;/a&gt;).&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;$ git grep ShardedClusterFixture buildscripts/resmokeconfig/ | grep passthrough | cut -d&apos;:&apos; -f1 | wc -l&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;&amp;nbsp;&lt;/pre&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;$ for suite in `git grep ShardedClusterFixture buildscripts/resmokeconfig/ | grep passthrough | cut -d&apos;:&apos; -f1`; do grep num_shards $suite; done | wc -l&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;   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;24&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;This means that plenty of tests are being executed on a one-shard cluster whose behavior is pretty much similar to a plain replicaset, without spotting potential errors happening in multi-shard environments.&lt;/p&gt;

&lt;p&gt;As an example of drawback, the jscore passthrough suite is only initializing one shard and did not catch a severe bug (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66031&quot; title=&quot;Command(s) hang when specifying collectionUUID for unsharded collection on sharded cluster&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66031&quot;&gt;&lt;del&gt;SERVER-66031&lt;/del&gt;&lt;/a&gt;) introduced by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62455&quot; title=&quot;Add collectionUUID parameter to renameCollection command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62455&quot;&gt;&lt;del&gt;SERVER-62455&lt;/del&gt;&lt;/a&gt;. Simply increasing the number of shards would have resulted in consistently hitting the problem.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2046984">SERVER-66474</key>
            <summary>Consider increasing number of shards in sharding passthrough suites</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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-server-catalog-and-routing">Backlog - Catalog and Routing</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                            <label>12/12</label>
                    </labels>
                <created>Mon, 16 May 2022 08:05:03 +0000</created>
                <updated>Tue, 12 Dec 2023 14:28:52 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>4</watches>
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            <issuekey id="2034961">SERVER-66031</issuekey>
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