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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-36741] ChunkManager::getShardIdsForRange invariants when max = MaxKey</title>
                <link>https://jira.mongodb.org/browse/SERVER-36741</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;tt&gt;ChunkManager::getShardIdsForRange&lt;/tt&gt; call contains an &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2628472127e9f1826e02c665c1d93880a204075e/src/mongo/s/chunk_manager.cpp#L182&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;invariant&lt;/a&gt; to ensure that the range it is passed is contained within the shard key space for the collection.&lt;/p&gt;

&lt;p&gt;However, this invariant is incorrect when the range ends in MaxKey, because MaxKey is not a valid key value. The invariant should be extended to account for MaxKey and as part of fixing this we should write unit-tests to validate this logic.&lt;/p&gt;

&lt;p&gt;This bug does not exist in versions 4.0 and later, because we use a different structure for the chunk ranges.&lt;/p&gt;</description>
                <environment></environment>
        <key id="590224">SERVER-36741</key>
            <summary>ChunkManager::getShardIdsForRange invariants when max = MaxKey</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="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                            <label>Sharding:BugfixDay</label>
                            <label>neweng</label>
                    </labels>
                <created>Fri, 17 Aug 2018 19:05:16 +0000</created>
                <updated>Sun, 29 Oct 2023 22:28:50 +0000</updated>
                            <resolved>Wed, 29 Aug 2018 19:39:33 +0000</resolved>
                                    <version>3.6.7</version>
                                    <fixVersion>3.6.8</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1989238" author="xgen-internal-githook" created="Wed, 29 Aug 2018 19:36:21 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36741&quot; title=&quot;ChunkManager::getShardIdsForRange invariants when max = MaxKey&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36741&quot;&gt;&lt;del&gt;SERVER-36741&lt;/del&gt;&lt;/a&gt; Remove overzealous invariant in ChunkManager::getShardIdsForRange&lt;/p&gt;

&lt;p&gt;The invariant disallows looking up ranges [MaxKey, MaxKey). While such a&lt;br/&gt;
range is not valid, it is difficult to prevent it from being generated by&lt;br/&gt;
the query system in a query such as {_id: MaxKey}.&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d836cb8ed7375d5898d4ea60e3e8c4ab53b94cc1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d836cb8ed7375d5898d4ea60e3e8c4ab53b94cc1&lt;/a&gt;&lt;/p&gt;</comment>
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