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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-38971] Single shard query hits multiple shard if it includes end of chunk range </title>
                <link>https://jira.mongodb.org/browse/SERVER-38971</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I have a sharded collection on r,u and the following chunks:&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;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-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;{ &quot;r&quot; : &quot;gce-us-east1&quot;, &quot;u&quot; : &quot;UwAbyt9D6Zo1qlfk0XptAQ==&quot; } --&amp;gt;&amp;gt; \{ &quot;r&quot; : &quot;gce-us-east1&quot;, &quot;u&quot; : &quot;Uwa+Dw0ZrJLFb7mVj/GykQ==&quot; } on : sessions_gce_us_east1_2 Timestamp(2075, 0)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;{ &quot;r&quot; : &quot;gce-us-east1&quot;, &quot;u&quot; : &quot;Uwa+Dw0ZrJLFb7mVj/GykQ==&quot; } --&amp;gt;&amp;gt; \{ &quot;r&quot; : &quot;gce-us-east1&quot;, &quot;u&quot; : &quot;UxOVavlFZXtKRL5MnB+1uQ==&quot; } on : sessions_gce_us_east1_2 Timestamp(2076, 0)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;{ &quot;r&quot; : &quot;gce-us-east1&quot;, &quot;u&quot; : &quot;UxOVavlFZXtKRL5MnB+1uQ==&quot; } --&amp;gt;&amp;gt; \{ &quot;r&quot; : &quot;gce-us-east1&quot;, &quot;u&quot; : &quot;UypBVrgDwfPLcNfvhz8okw==&quot; } on : sessions_gce_us_east1 Timestamp(1, 13711)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;{ &quot;r&quot; : &quot;gce-us-east1&quot;, &quot;u&quot; : &quot;UypBVrgDwfPLcNfvhz8okw==&quot; } --&amp;gt;&amp;gt; \{ &quot;r&quot; : &quot;gce-us-east1&quot;, &quot;u&quot; : &quot;V+DYS8SwGMnenYmNyvNQsA==&quot; } on : sessions_gce_us_east1 Timestamp(1, 13712)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;If I do a query that involves {u: &quot;UxOVavlFZXtKRL5MnB+1uQ==&quot;} then it will hit both shards even though it only needs to hit sessions_gce_us_east1_2.&lt;/p&gt;</description>
                <environment></environment>
        <key id="671602">SERVER-38971</key>
            <summary>Single shard query hits multiple shard if it includes end of chunk range </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="3">Duplicate</resolution>
                                        <assignee username="daniel.hatcher@mongodb.com">Danny Hatcher</assignee>
                                    <reporter username="james@getadmiral.com">James Hartig</reporter>
                        <labels>
                    </labels>
                <created>Sun, 13 Jan 2019 15:13:35 +0000</created>
                <updated>Mon, 15 Nov 2021 16:41:10 +0000</updated>
                            <resolved>Mon, 14 Jan 2019 16:32:44 +0000</resolved>
                                    <version>4.0.5</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="2114217" author="daniel.hatcher" created="Mon, 14 Jan 2019 16:32:31 +0000"  >&lt;p&gt;Hello James,&lt;/p&gt;

&lt;p&gt;Thank you for your report. You have encountered &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20768&quot; title=&quot;Mongos find query including upper bound X of a chunk also targets the shard with chunk having lower bound = X&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20768&quot;&gt;SERVER-20768&lt;/a&gt;. Any work that would resolve this scenario will be performed on that ticket so I will close this ticket as a duplicate. &lt;/p&gt;

&lt;p&gt;Thank you,&lt;/p&gt;

&lt;p&gt;Danny&lt;/p&gt;</comment>
                            <comment id="2113478" author="james@getadmiral.com" created="Sun, 13 Jan 2019 18:48:58 +0000"  >&lt;p&gt;I attached verbose logging from mongos when I run the query. The relevant connection is &quot;conn118&quot;&lt;/p&gt;</comment>
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                            <attachment id="206157" name="mongos.key.log" size="142492" author="admiraljames" created="Sun, 13 Jan 2019 18:48:27 +0000"/>
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	&lt;li&gt;Query&#160;db.sessions4.find({r: &quot;gce-us-east1&quot;, u: {$lt: &quot;UxOVavlFZXtKRL5MnB+1uQ==&quot;}}).limit(2).explain()&lt;/li&gt;
	&lt;li&gt;It will show that it needs to query both shards&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;But if you instead remove one character from the u field:&lt;/p&gt;

&lt;p&gt;db.sessions4.find({r: &quot;gce-us-east1&quot;, u: {$lt: &quot;UxOVavlFZXtKRL5MnB+1uQ=&quot;}}).limit(2).explain()&lt;/p&gt;

&lt;p&gt;It will show that it only needs to query 1 shard&lt;/p&gt;</customfieldvalue>

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