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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-16969] First split in the chunk has a higher threshold than the rest</title>
                <link>https://jira.mongodb.org/browse/SERVER-16969</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If the current total dataSize in the collection within a shard is smaller than given maxChunkSize, splitVector will return early:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r2.8.0-rc5/src/mongo/s/d_split.cpp#L357&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r2.8.0-rc5/src/mongo/s/d_split.cpp#L357&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Whereas, if there are sufficient amount of bytes in the collection, it can return with a split point as long as the average size in the chunk range is more than maxChunkSize / 2&lt;/p&gt;</description>
                <environment></environment>
        <key id="179978">SERVER-16969</key>
            <summary>First split in the chunk has a higher threshold than the rest</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Wed, 21 Jan 2015 18:28:23 +0000</created>
                <updated>Tue, 6 Dec 2022 04:56:44 +0000</updated>
                            <resolved>Mon, 1 Apr 2019 12:35:13 +0000</resolved>
                                    <version>2.8.0-rc5</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2174659" author="renctan" created="Thu, 7 Mar 2019 16:56:24 +0000"  >&lt;p&gt;Not a huge impact, that&apos;s why I made it minor. The user will just observe that there&apos;s a higher threshold before we decide to split for the first few chunks of the shard. This probably affects hashed shard key more since the chunks would be initially scattered across all shards and the collection is empty.&lt;/p&gt;</comment>
                            <comment id="2174548" author="kaloian.manassiev" created="Thu, 7 Mar 2019 15:46:14 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=renctan&quot; class=&quot;user-hover&quot; rel=&quot;renctan&quot;&gt;renctan&lt;/a&gt;, do you remember what is the customer-visible side effect of this? I don&apos;t quite get it from the description.&lt;/p&gt;</comment>
                            <comment id="809802" author="renctan" created="Wed, 21 Jan 2015 19:06:27 +0000"  >&lt;p&gt;It has been like this since 1.8...&lt;/p&gt;</comment>
                            <comment id="809797" author="schwerin" created="Wed, 21 Jan 2015 19:00:29 +0000"  >&lt;p&gt;Also in prior releases, or new in the most recent dev cycle?&lt;/p&gt;</comment>
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