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    <link>https://jira.mongodb.org</link>
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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-59867] Split horizon mappings in ReplSetConfig/MemberConfig should be serialized deterministically</title>
                <link>https://jira.mongodb.org/browse/SERVER-59867</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The toBSON() for SplitHorizon serializes the strings in a StringMap in iterator order, which is by design nondeterministic.  The resulting configs are equivalent, but since we use ordered comparisons to test if they are equivalent when seeing if contents have changed, we can erroneously detect changes in the set when there haven&apos;t been any.  This can lead to extra network traffic (isSelf) and unnecessary read-concern-majority delay (because we will unnecessarily clear the committed snapshot)&lt;/p&gt;

&lt;p&gt;ReplSetConfigWriteConcernModes has the same issue.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1871099">SERVER-59867</key>
            <summary>Split horizon mappings in ReplSetConfig/MemberConfig should be serialized deterministically</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="matthew.russotto@mongodb.com">Matthew Russotto</assignee>
                                    <reporter username="matthew.russotto@mongodb.com">Matthew Russotto</reporter>
                        <labels>
                    </labels>
                <created>Thu, 9 Sep 2021 20:21:54 +0000</created>
                <updated>Sun, 29 Oct 2023 21:48:45 +0000</updated>
                            <resolved>Mon, 27 Sep 2021 12:25:02 +0000</resolved>
                                    <version>4.4.8</version>
                    <version>5.0.2</version>
                                    <fixVersion>4.4.10</fixVersion>
                    <fixVersion>5.0.4</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                                        <votes>1</votes>
                                    <watches>20</watches>
                                                                                                                <comments>
                            <comment id="4086995" author="xgen-internal-githook" created="Mon, 27 Sep 2021 16:36:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Russotto&apos;, &apos;email&apos;: &apos;matthew.russotto@mongodb.com&apos;, &apos;username&apos;: &apos;mtrussotto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59867&quot; title=&quot;Split horizon mappings in ReplSetConfig/MemberConfig should be serialized deterministically&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59867&quot;&gt;&lt;del&gt;SERVER-59867&lt;/del&gt;&lt;/a&gt; Split horizon mappings in ReplSetConfig/MemberConfig should be serialized deterministically.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 8675c70fd480557fd1c5c9b3ce9e731b1101f93f)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d049950543b522291f71145acb601e7d5401b28c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d049950543b522291f71145acb601e7d5401b28c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4086642" author="xgen-internal-githook" created="Mon, 27 Sep 2021 15:17:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Russotto&apos;, &apos;email&apos;: &apos;matthew.russotto@mongodb.com&apos;, &apos;username&apos;: &apos;mtrussotto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59867&quot; title=&quot;Split horizon mappings in ReplSetConfig/MemberConfig should be serialized deterministically&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59867&quot;&gt;&lt;del&gt;SERVER-59867&lt;/del&gt;&lt;/a&gt; Split horizon mappings in ReplSetConfig/MemberConfig should be serialized deterministically.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 8675c70fd480557fd1c5c9b3ce9e731b1101f93f)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2b64b4a8f7149bac05648eff15e95a4a8330d220&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2b64b4a8f7149bac05648eff15e95a4a8330d220&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4084464" author="xgen-internal-githook" created="Fri, 24 Sep 2021 23:08:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Russotto&apos;, &apos;email&apos;: &apos;matthew.russotto@mongodb.com&apos;, &apos;username&apos;: &apos;mtrussotto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59867&quot; title=&quot;Split horizon mappings in ReplSetConfig/MemberConfig should be serialized deterministically&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59867&quot;&gt;&lt;del&gt;SERVER-59867&lt;/del&gt;&lt;/a&gt; Split horizon mappings in ReplSetConfig/MemberConfig sho&#8230;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8675c70fd480557fd1c5c9b3ce9e731b1101f93f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8675c70fd480557fd1c5c9b3ce9e731b1101f93f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4078206" author="judah.schvimer" created="Wed, 22 Sep 2021 17:50:39 +0000"  >&lt;p&gt;Is there ever a circumstance where we&apos;d expect to detect config changes on step up? If not, we should ensure step up never has this negative performance impact. &lt;/p&gt;</comment>
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