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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-51731] ChunkManager::getShardIdsForRange should not hardcode isMaxInclusive to true</title>
                <link>https://jira.mongodb.org/browse/SERVER-51731</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;getShardIdsForRange currently &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bfd22982681e0af44f52b586b432091174d17945/src/mongo/s/chunk_manager.cpp#L463&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;hardcodes isMaxInclusive to true&lt;/a&gt; and that causes mongos to target both of the shards in the following case.&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;
		&lt;tbody &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-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;const st = ShardingTest({shards: 2});&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;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&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;   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;assert.commandWorked(st.s.adminCommand({enableSharding: &quot;foo&quot;}));&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;   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;st.ensurePrimaryShard(&quot;foo&quot;, st.shard0.shardName);&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;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&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;   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;assert.commandWorked(st.s.adminCommand({shardCollection: &quot;foo.bar&quot;, key: {_id: 1}}));&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;   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;assert.commandWorked(st.s.adminCommand({split: &quot;foo.bar&quot;, middle: {_id: 10}}));&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;   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;assert.commandWorked(st.s.adminCommand({moveChunk: &quot;foo.bar&quot;, find: {_id: 10}, to: st.shard1.shardName, _waitForDelete: true}));&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;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&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;   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;assert.commandWorked(st.s.getDB(&quot;foo&quot;).runCommand({find: &quot;bar&quot;, filter: {_id: {$lt: 10}}}));&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;st.stop();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="1518668">SERVER-51731</key>
            <summary>ChunkManager::getShardIdsForRange should not hardcode isMaxInclusive to true</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.gottlieb@mongodb.com">Daniel Gottlieb</assignee>
                                    <reporter username="cheahuychou.mao@mongodb.com">Cheahuychou Mao</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Mon, 19 Oct 2020 17:26:23 +0000</created>
                <updated>Fri, 23 Oct 2020 02:54:29 +0000</updated>
                            <resolved>Fri, 23 Oct 2020 02:54:29 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3460714" author="daniel.gottlieb@10gen.com" created="Fri, 23 Oct 2020 02:54:05 +0000"  >&lt;p&gt;This turns out to be a dup of &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;. &lt;/p&gt;

&lt;p&gt;Because I&apos;ve chased this down, I&apos;ll write up my observations (even though &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; and the trickle of other dupes linked to that over the years basically includes all of them):&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;The claim is correct, doing a range query on the exclusive upper bound of a chunk will needlessly scatter the request to an additional shard (assuming the shard for the following chunk is not already required for some other chunk covered by the range).&lt;/li&gt;
	&lt;li&gt;I don&apos;t see any reason to believe this is a correctness problem.&lt;/li&gt;
	&lt;li&gt;From what I can tell, the code has been this way since at least 2012.&lt;/li&gt;
	&lt;li&gt;When generating &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bddf687cc0447f85062f312b90f5044abcf92400/src/mongo/s/chunk_manager.cpp#L417&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;IndexBounds&lt;/a&gt;, the appropriate inclusive/exclusive properties are preserved.&lt;/li&gt;
	&lt;li&gt;When flattening the &lt;tt&gt;IndexBounds&lt;/tt&gt; into a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bddf687cc0447f85062f312b90f5044abcf92400/src/mongo/s/chunk_manager.cpp#L424&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;BoundList&lt;/tt&gt;&lt;/a&gt;, the granularity is lost. A &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bddf687cc0447f85062f312b90f5044abcf92400/src/mongo/s/shard_key_pattern.h#L48-L57&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;BoundsList&lt;/tt&gt; is documented as&lt;/a&gt;  inclusive on both ends.&lt;/li&gt;
	&lt;li&gt;Unconditionally &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bddf687cc0447f85062f312b90f5044abcf92400/src/mongo/s/chunk_manager.cpp#L463&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;changing isMaxInclusive from true to false&lt;/a&gt; would be a correctness bug (this was never suggested, but figured I&apos;d put it out there).&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;As far as making a change goes, I have can think of an obvious adjustment to the algorithm for preserving any exclusive upper bounds when computing the &lt;tt&gt;BoundList&lt;/tt&gt;, but it&apos;s not obvious to me it&apos;s correct. I don&apos;t have any reason to believe it&apos;s wrong, but this isn&apos;t something I&apos;d feel confident guessing at.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                            <outwardlinks description="duplicates">
                                        <issuelink>
            <issuekey id="232910">SERVER-20768</issuekey>
        </issuelink>
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