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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-37918] Fast initial split algorithm produces corrupted routing info if passed unsorted zones list</title>
                <link>https://jira.mongodb.org/browse/SERVER-37918</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bb8a75e904bb2accb192772126bc319cd16646a4/src/mongo/db/s/config/initial_split_policy.cpp#L209&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;fast initial split algorithm&lt;/a&gt; operates by iterating the set of zones for a collection and writing chunks for each zone and for each &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bb8a75e904bb2accb192772126bc319cd16646a4/src/mongo/db/s/config/initial_split_policy.cpp#L230&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&quot;hole&quot;&lt;/a&gt; between zones. However, the main assumption of this logic is that the set of zones comes in sorted order. Otherwise, the results are unpredictable.&lt;/p&gt;

&lt;p&gt;The current &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bb8a75e904bb2accb192772126bc319cd16646a4/src/mongo/db/s/shardsvr_shard_collection.cpp#L555&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;caller of the algorhtm&lt;/a&gt; doesn&apos;t pass a sort based on the &lt;tt&gt;min&lt;/tt&gt; key of the tags, which means tags could come in the order in which they were inserted, which is not necessarily sorted.&lt;/p&gt;

&lt;p&gt;This is not a data-loss bug, but it renders the Geo sharding feature unusable in random cases.&lt;/p&gt;</description>
                <environment></environment>
        <key id="629086">SERVER-37918</key>
            <summary>Fast initial split algorithm produces corrupted routing info if passed unsorted zones list</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>
                    </labels>
                <created>Mon, 5 Nov 2018 11:18:45 +0000</created>
                <updated>Sun, 29 Oct 2023 22:26:53 +0000</updated>
                            <resolved>Mon, 5 Nov 2018 16:59:38 +0000</resolved>
                                    <version>4.0.3</version>
                                    <fixVersion>4.0.5</fixVersion>
                    <fixVersion>4.1.5</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2064411" author="xgen-internal-githook" created="Fri, 16 Nov 2018 14:24:14 +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-37918&quot; title=&quot;Fast initial split algorithm produces corrupted routing info if passed unsorted zones list&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37918&quot;&gt;&lt;del&gt;SERVER-37918&lt;/del&gt;&lt;/a&gt; Improve the messaging around corrupted routing metadata&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 8319bd16ad2fdac48db6530570bb5913859509f0)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b02a8a12d698772b88b669435836e5af0828c56b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b02a8a12d698772b88b669435836e5af0828c56b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2052143" author="xgen-internal-githook" created="Mon, 5 Nov 2018 18:21:43 +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-37918&quot; title=&quot;Fast initial split algorithm produces corrupted routing info if passed unsorted zones list&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37918&quot;&gt;&lt;del&gt;SERVER-37918&lt;/del&gt;&lt;/a&gt; Make sure tags passed to the fast initial split algorithm are in sorted order&lt;/p&gt;

&lt;p&gt;(cherry picked from commit b0c9a1c8419d7a343c2a0496f2cd6a7c0c4d8c92)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/650d5df4c7f033da7cae1d50c3cdb43c6d1c9739&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/650d5df4c7f033da7cae1d50c3cdb43c6d1c9739&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2051954" author="xgen-internal-githook" created="Mon, 5 Nov 2018 16:49:36 +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-37918&quot; title=&quot;Fast initial split algorithm produces corrupted routing info if passed unsorted zones list&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37918&quot;&gt;&lt;del&gt;SERVER-37918&lt;/del&gt;&lt;/a&gt; Improve the messaging around corrupted routing metadata&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8319bd16ad2fdac48db6530570bb5913859509f0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8319bd16ad2fdac48db6530570bb5913859509f0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2051953" author="xgen-internal-githook" created="Mon, 5 Nov 2018 16:49:35 +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-37918&quot; title=&quot;Fast initial split algorithm produces corrupted routing info if passed unsorted zones list&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37918&quot;&gt;&lt;del&gt;SERVER-37918&lt;/del&gt;&lt;/a&gt; Make sure tags passed to the fast initial split algorithm are in sorted order&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b0c9a1c8419d7a343c2a0496f2cd6a7c0c4d8c92&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b0c9a1c8419d7a343c2a0496f2cd6a7c0c4d8c92&lt;/a&gt;&lt;/p&gt;</comment>
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