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    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-58048] Resharding&apos;s initial split points for hashed shard keys don&apos;t match the sampled values</title>
                <link>https://jira.mongodb.org/browse/SERVER-58048</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;ReshardingSplitPolicy::_appendSplitPointsFromSample() hashes the already&amp;#45;hashed shard key value for a second time by &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1c65954179826c76a0922e35bd4429600a1448f6/src/mongo/db/s/config/initial_split_policy.cpp#L836&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;calling &lt;tt&gt;shardKey.extractShardKeyFromDoc(&amp;#42;nextKey)&lt;/tt&gt;&lt;/a&gt;. A solution is probably to use &lt;tt&gt;dotted_path_support::extractElementsBasedOnTemplate(&amp;#42;nextKey, shardKey.toBSON())&lt;/tt&gt; instead, which is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1c65954179826c76a0922e35bd4429600a1448f6/src/mongo/db/op_observer_impl.cpp#L312&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;how the shard key is extracted for oplog entries&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;(This bug was found via code inspection while tracking down &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58047&quot; title=&quot;$toHashedIndexKey expression doesn&amp;#39;t add any dependencies&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58047&quot;&gt;&lt;del&gt;SERVER-58047&lt;/del&gt;&lt;/a&gt;.)&lt;/p&gt;</description>
                <environment></environment>
        <key id="1795917">SERVER-58048</key>
            <summary>Resharding&apos;s initial split points for hashed shard keys don&apos;t match the sampled values</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="luis.osta@mongodb.com">Luis Osta</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                            <label>PM-234-M3</label>
                            <label>PM-234-T-new-split</label>
                    </labels>
                <created>Thu, 24 Jun 2021 00:55:32 +0000</created>
                <updated>Sun, 29 Oct 2023 21:51:40 +0000</updated>
                            <resolved>Tue, 13 Jul 2021 16:08:47 +0000</resolved>
                                                    <fixVersion>5.0.2</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="4107184" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:19:40 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3965426" author="xgen-internal-githook" created="Tue, 27 Jul 2021 14:56:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Luis Osta&apos;, &apos;email&apos;: &apos;luis.osta@mongodb.com&apos;, &apos;username&apos;: &apos;LuisOsta&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58048&quot; title=&quot;Resharding&amp;#39;s initial split points for hashed shard keys don&amp;#39;t match the sampled values&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58048&quot;&gt;&lt;del&gt;SERVER-58048&lt;/del&gt;&lt;/a&gt; Resharding&apos;s initial split points for hashed shard keys don&apos;t match the sampled values (cherry picked from commit a0fe43ef0713bf923884e6afa1b11bab992f1ca9)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ca7a3ba8e51377f3cf9e8fdf3e1883c1ea8bfdb5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ca7a3ba8e51377f3cf9e8fdf3e1883c1ea8bfdb5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3948441" author="xgen-internal-githook" created="Sat, 17 Jul 2021 22:09:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58048&quot; title=&quot;Resharding&amp;#39;s initial split points for hashed shard keys don&amp;#39;t match the sampled values&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58048&quot;&gt;&lt;del&gt;SERVER-58048&lt;/del&gt;&lt;/a&gt; fix mac os x compile - explicit LL suffix to fix XCode build&lt;/p&gt;

&lt;p&gt;Similar fix was previously applied in commit 2675ca0d17d2d2e24d25fcea2f6c9f46ce1be2d4.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a0fe43ef0713bf923884e6afa1b11bab992f1ca9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a0fe43ef0713bf923884e6afa1b11bab992f1ca9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3930895" author="xgen-internal-githook" created="Tue, 13 Jul 2021 16:01:32 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Luis Osta&apos;, &apos;email&apos;: &apos;luis.osta@mongodb.com&apos;, &apos;username&apos;: &apos;LuisOsta&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58048&quot; title=&quot;Resharding&amp;#39;s initial split points for hashed shard keys don&amp;#39;t match the sampled values&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58048&quot;&gt;&lt;del&gt;SERVER-58048&lt;/del&gt;&lt;/a&gt; Resharding&apos;s initial split points for hashed shard keys don&apos;t match the sampled values&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/95d0727d955e543a2f9440c49bb101f793b6a7f9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/95d0727d955e543a2f9440c49bb101f793b6a7f9&lt;/a&gt;&lt;/p&gt;</comment>
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