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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-28044] Improve / Refactor ConfigDiffTracker chunk reload logic</title>
                <link>https://jira.mongodb.org/browse/SERVER-28044</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There is no reason to have the error check found &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/s/chunk_diff.cpp#L157-L158&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; in the ConfigDiffTracker during chunk reload. Whatever &apos;inconsistent&apos; state that may have previously existed no longer exists. &lt;/p&gt;

&lt;p&gt;The &lt;/p&gt;
{ns, lastmod}
&lt;p&gt; index on config.chunks, together with querying by ascending &apos;lastmod&apos; value and writes to config.chunks always having higher &apos;lastmod&apos; values than any existing document, assures that any writes that pause reads midway will not cause any documents to be missed. The only thing that can happen is that a read pauses partway through, an update happens to a document already read, and we then read the updated document. This will return two documents with the same _id field. This will actually cause our current reload logic to fail, but there is no reason it should fail. Rather than a loop to remove all overlaps, and then a second loop to insert all new documents and check again for overlap, which errors, we should have a single loop that removes overlaps and inserts in a rolling fashion. Then there is no issue.&lt;/p&gt;

&lt;p&gt;Doing this would make the reload logic cleaner and easier to follow &amp;#8211; right now there are more comments, some mysterious, to explain the more complicated logic --, and prevent possible failures that should be entirely unnecessary.&lt;/p&gt;</description>
                <environment></environment>
        <key id="355234">SERVER-28044</key>
            <summary>Improve / Refactor ConfigDiffTracker chunk reload logic</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Fri, 17 Feb 2017 19:40:11 +0000</created>
                <updated>Tue, 31 Oct 2017 19:24:36 +0000</updated>
                            <resolved>Wed, 5 Apr 2017 17:00:44 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1541684" author="kaloian.manassiev" created="Wed, 5 Apr 2017 17:00:27 +0000"  >&lt;p&gt;This ticket has been completed as part of the changes for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22611&quot; title=&quot;ChunkManager refresh can occasionally cause a full reload&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22611&quot;&gt;&lt;del&gt;SERVER-22611&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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            <issuekey id="367107">SERVER-28429</issuekey>
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