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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>
    </build-info>


<item>
            <title>[SERVER-56307] The chunk migration &quot;convergence algorithm&quot; is very primitive</title>
                <link>https://jira.mongodb.org/browse/SERVER-56307</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The chunk migration &quot;convergence algorithm&quot; is the logic which the donor and participant implement in order for the donor to decide when to enter the critical section and block writes.&lt;/p&gt;

&lt;p&gt;The current implementation relies on the recipient being capable of&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/913217ab00e3597bf763e40904cdd159e7e8cb2b/src/mongo/db/s/migration_destination_manager.cpp#L1162&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;catching up on every modification occurred during the migration&lt;/a&gt;&#160;and reaching the STEADY state to allow the donor to enter the critical section.&lt;/p&gt;

&lt;p&gt;It has been detected that under situations of heavy load&#160;such condition may be never met, as the rate of incoming modifications is bigger than what can be transferred to the recipient.&lt;/p&gt;

&lt;p&gt;Potetial fixes are:&lt;/p&gt;

&lt;p&gt;(1) The donor sends to the recipient some measure of how much mods are left, so it can enter the steady state based on some delta, rather than zero.&lt;/p&gt;

&lt;p&gt;(2) The donor decides to enter the critical section not based on whether the recipient has decided to enter steady-state (which includes a&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/913217ab00e3597bf763e40904cdd159e7e8cb2b/src/mongo/db/s/migration_destination_manager.cpp#L1222&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;wait for majority&lt;/a&gt;)&lt;br/&gt;
(Option 2 might not be appropriate, though because it adds the recipient&apos;s majority wait under the critical section)&lt;/p&gt;</description>
                <environment></environment>
        <key id="1689612">SERVER-56307</key>
            <summary>The chunk migration &quot;convergence algorithm&quot; is very primitive</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="13201">Fixed</resolution>
                                        <assignee username="paolo.polato@mongodb.com">Paolo Polato</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Fri, 23 Apr 2021 15:56:19 +0000</created>
                <updated>Sun, 29 Oct 2023 21:54:35 +0000</updated>
                            <resolved>Fri, 18 Jun 2021 09:54:34 +0000</resolved>
                                                    <fixVersion>4.2.15</fixVersion>
                    <fixVersion>4.4.7</fixVersion>
                    <fixVersion>4.0.26</fixVersion>
                    <fixVersion>5.0.0-rc3</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>19</watches>
                                                                                                                <comments>
                            <comment id="3960736" author="xgen-internal-githook" created="Fri, 23 Jul 2021 19:59:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;andf-mongodb&apos;, &apos;email&apos;: &apos;andrew.feierabend@mongodb.com&apos;, &apos;username&apos;: &apos;andf-mongodb&apos;}
&lt;p&gt;Message: DOCSP-16424 remove &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; from 4.0.25 release notes top5&lt;br/&gt;
Branch: v4.2.15&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/ada6934168b1b4f406a8b5d90c3b6b979c1cec99&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/ada6934168b1b4f406a8b5d90c3b6b979c1cec99&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3893362" author="xgen-internal-githook" created="Wed, 23 Jun 2021 08:43:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; fix the convergence criteria to end the catchup phase&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 49209fc34e19bbb15405b0927e38ff3e7d9e9dc5)&lt;br/&gt;
(cherry picked from commit cbddd17826a934022c4be6287afc3dfde8206ad8)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3f53fa25e014fbe85d35220612359b8006f7e457&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3f53fa25e014fbe85d35220612359b8006f7e457&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3893361" author="xgen-internal-githook" created="Wed, 23 Jun 2021 08:43:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; Allow the donor to enter the critical section when the untransferred mods are within a convergence threshold.&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d6ffe85b864709e1da57e037b1ad3b74d77b6a45&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d6ffe85b864709e1da57e037b1ad3b74d77b6a45&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3888825" author="xgen-internal-githook" created="Mon, 21 Jun 2021 15:15:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; fix the convergence criteria to end the catchup phase&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 49209fc34e19bbb15405b0927e38ff3e7d9e9dc5)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c855011857e09e31498acf8a45fab630589aaf7c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c855011857e09e31498acf8a45fab630589aaf7c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3888824" author="xgen-internal-githook" created="Mon, 21 Jun 2021 15:15:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; fix name of server parameter&lt;/p&gt;

&lt;p&gt;(cherry picked from commit d40fb7099961fa73de106f390bb9396676bac0bc)&lt;br/&gt;
(cherry picked from commit 388d5c4ae92e3f63b1fcc8181702167a9b1f6c5e)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a3caa74ad14fbe1bbbb68382548393a3db29fdb1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a3caa74ad14fbe1bbbb68382548393a3db29fdb1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3888822" author="xgen-internal-githook" created="Mon, 21 Jun 2021 15:15:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; Ensure that the estimated size of an object id is always bigger than zero.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 7d0aee4c7dec9380c3ef8be20c31b1334b27cd20)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/aa716ebc9b4459881540b657986859e6ef3e15c6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/aa716ebc9b4459881540b657986859e6ef3e15c6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3888821" author="xgen-internal-githook" created="Mon, 21 Jun 2021 15:15:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; Allow the donor to enter the critical section when the untransferred mods are within a convergence threshold.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 44bdd2c38fd5c80881e15f40e2da6cacf5f35eb4)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c35c05f6e55a44a15972040f8c552a18a7725dfa&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c35c05f6e55a44a15972040f8c552a18a7725dfa&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3888557" author="xgen-internal-githook" created="Mon, 21 Jun 2021 14:15:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; fix the convergence criteria to end the catchup phase&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 49209fc34e19bbb15405b0927e38ff3e7d9e9dc5)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cbddd17826a934022c4be6287afc3dfde8206ad8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cbddd17826a934022c4be6287afc3dfde8206ad8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3888556" author="xgen-internal-githook" created="Mon, 21 Jun 2021 14:15:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; Allow the donor to enter the critical section when the untransferred mods are within a convergence threshold.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 3394ccd20ee2a77f3526c481799943c7418bff00)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f66379b24b696e5591e1a923ba63c816568be838&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f66379b24b696e5591e1a923ba63c816568be838&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3888314" author="xgen-internal-githook" created="Mon, 21 Jun 2021 12:32:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; fix the convergence criteria to end the catchup phase&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 49209fc34e19bbb15405b0927e38ff3e7d9e9dc5)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/dc9ec40e350511d6f74b299cbf52b38609a5c947&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/dc9ec40e350511d6f74b299cbf52b38609a5c947&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3888313" author="xgen-internal-githook" created="Mon, 21 Jun 2021 12:32:22 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; fix name of server parameter&lt;/p&gt;

&lt;p&gt;(cherry picked from commit d40fb7099961fa73de106f390bb9396676bac0bc)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d2540340cdd788dc8a54a0030166c0baaa3c26a9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d2540340cdd788dc8a54a0030166c0baaa3c26a9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3888312" author="xgen-internal-githook" created="Mon, 21 Jun 2021 12:32:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; Allow the donor to enter the critical section when the untransferred mods are within a convergence threshold.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit f32a3d08fb7128de3c1b43b8478a5e4626101b89)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c84c7f406a7fc0ea5a63a5cc807687e730580a70&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c84c7f406a7fc0ea5a63a5cc807687e730580a70&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3886519" author="xgen-internal-githook" created="Fri, 18 Jun 2021 08:39:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; fix the convergence criteria to end the catchup phase&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/49209fc34e19bbb15405b0927e38ff3e7d9e9dc5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/49209fc34e19bbb15405b0927e38ff3e7d9e9dc5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3880368" author="xgen-internal-githook" created="Wed, 16 Jun 2021 08:28:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; fix name of server parameter&lt;br/&gt;
Branch: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34632&quot; title=&quot;config.chunks change to config.cache.chunks creates a collection long name after upgrade&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34632&quot;&gt;SERVER-34632&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d40fb7099961fa73de106f390bb9396676bac0bc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d40fb7099961fa73de106f390bb9396676bac0bc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3879469" author="xgen-internal-githook" created="Tue, 15 Jun 2021 19:50:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; Allow the donor to enter the critical section when the untransferred mods are within a convergence threshold.&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 3394ccd20ee2a77f3526c481799943c7418bff00.&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6833d9572ee12cbf9dd2e74a006c38cc35416fde&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6833d9572ee12cbf9dd2e74a006c38cc35416fde&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3879183" author="jonathan.streets" created="Tue, 15 Jun 2021 18:03:02 +0000"  >&lt;p&gt;removed 5.0.0-rc2 and 4.4.7 fixVersions to reflect the reverts.&lt;/p&gt;</comment>
                            <comment id="3878786" author="xgen-internal-githook" created="Tue, 15 Jun 2021 15:49:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; Allow the donor to enter the critical section when the untransferred mods are within a convergence threshold.&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 44bdd2c38fd5c80881e15f40e2da6cacf5f35eb4.&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0e1797f37d8f9a4997a5817539a547e5e3107eb5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0e1797f37d8f9a4997a5817539a547e5e3107eb5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3878785" author="xgen-internal-githook" created="Tue, 15 Jun 2021 15:48:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; Ensure that the estimated size of an object id is always bigger than zero.&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 7d0aee4c7dec9380c3ef8be20c31b1334b27cd20.&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/73695f4b643527b67d972df57b765306063b94c2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/73695f4b643527b67d972df57b765306063b94c2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3878784" author="xgen-internal-githook" created="Tue, 15 Jun 2021 15:48:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; fix name of server parameter&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 388d5c4ae92e3f63b1fcc8181702167a9b1f6c5e.&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/faddcb44268d796c80306dfaffbd979f204f01ae&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/faddcb44268d796c80306dfaffbd979f204f01ae&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3878688" author="xgen-internal-githook" created="Tue, 15 Jun 2021 15:22:21 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; Allow the donor to enter the critical section when the untransferred mods are within a convergence threshold.&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit f32a3d08fb7128de3c1b43b8478a5e4626101b89.&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9fa32db73d2ccd331b7e0b871b3a4262ca9e9be0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9fa32db73d2ccd331b7e0b871b3a4262ca9e9be0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3877024" author="xgen-internal-githook" created="Mon, 14 Jun 2021 20:18:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; fix name of server parameter&lt;/p&gt;

&lt;p&gt;(cherry picked from commit d40fb7099961fa73de106f390bb9396676bac0bc)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/388d5c4ae92e3f63b1fcc8181702167a9b1f6c5e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/388d5c4ae92e3f63b1fcc8181702167a9b1f6c5e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3876154" author="xgen-internal-githook" created="Mon, 14 Jun 2021 15:26:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; fix name of server parameter&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d40fb7099961fa73de106f390bb9396676bac0bc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d40fb7099961fa73de106f390bb9396676bac0bc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3860275" author="xgen-internal-githook" created="Fri, 4 Jun 2021 16:47:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;andf-mongodb&apos;, &apos;email&apos;: &apos;andrew.feierabend@mongodb.com&apos;, &apos;username&apos;: &apos;andf-mongodb&apos;}
&lt;p&gt;Message: DOCSP-16424 remove &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; from 4.0.25 release notes top5&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/13d49157f9c53f8897d73fb02c4f9893dd56ca51&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/13d49157f9c53f8897d73fb02c4f9893dd56ca51&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3860271" author="xgen-internal-githook" created="Fri, 4 Jun 2021 16:46:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;andf-mongodb&apos;, &apos;email&apos;: &apos;andrew.feierabend@mongodb.com&apos;, &apos;username&apos;: &apos;andf-mongodb&apos;}
&lt;p&gt;Message: DOCSP-16424 remove &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; from 4.0.25 release notes top5&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/ada6934168b1b4f406a8b5d90c3b6b979c1cec99&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/ada6934168b1b4f406a8b5d90c3b6b979c1cec99&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3860268" author="xgen-internal-githook" created="Fri, 4 Jun 2021 16:46:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;andf-mongodb&apos;, &apos;email&apos;: &apos;andrew.feierabend@mongodb.com&apos;, &apos;username&apos;: &apos;andf-mongodb&apos;}
&lt;p&gt;Message: DOCSP-16424 remove &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; from 4.0.25 release notes top5&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/34cdcc863c2a747165db7b7072365533d38b8f41&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/34cdcc863c2a747165db7b7072365533d38b8f41&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3860264" author="xgen-internal-githook" created="Fri, 4 Jun 2021 16:46:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;andf-mongodb&apos;, &apos;email&apos;: &apos;andrew.feierabend@mongodb.com&apos;, &apos;username&apos;: &apos;andf-mongodb&apos;}
&lt;p&gt;Message: DOCSP-16424 remove &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; from 4.0.25 release notes top5&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/0a7b049fcbe7d018109e22d2219424bfeea16eab&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/0a7b049fcbe7d018109e22d2219424bfeea16eab&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3859954" author="xgen-internal-githook" created="Fri, 4 Jun 2021 15:14:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; Allow the donor to enter the critical section when the untransferred mods are within a convergence threshold.&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 40e1693cb180fd17ec6fa0e1b32acc21769c0b85.&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/89306fde6167fa12ea6e30d61e05791e8e214e55&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/89306fde6167fa12ea6e30d61e05791e8e214e55&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3803017" author="xgen-internal-githook" created="Fri, 21 May 2021 10:35:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; Allow the donor to enter the critical section when the untransferred mods are within a convergence threshold.&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3394ccd20ee2a77f3526c481799943c7418bff00&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3394ccd20ee2a77f3526c481799943c7418bff00&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3802898" author="xgen-internal-githook" created="Fri, 21 May 2021 10:19:46 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; Allow the donor to enter the critical section when the untransferred mods are within a convergence threshold.&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f32a3d08fb7128de3c1b43b8478a5e4626101b89&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f32a3d08fb7128de3c1b43b8478a5e4626101b89&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3793897" author="xgen-internal-githook" created="Thu, 20 May 2021 10:47:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; Allow the donor to enter the critical section when the untransferred mods are within a convergence threshold.&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/40e1693cb180fd17ec6fa0e1b32acc21769c0b85&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/40e1693cb180fd17ec6fa0e1b32acc21769c0b85&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3768866" author="xgen-internal-githook" created="Wed, 12 May 2021 13:01:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; Ensure that the estimated size of an object id is always bigger than zero.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7d0aee4c7dec9380c3ef8be20c31b1334b27cd20&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7d0aee4c7dec9380c3ef8be20c31b1334b27cd20&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3768493" author="xgen-internal-githook" created="Wed, 12 May 2021 09:01:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56307&quot; title=&quot;The chunk migration &amp;quot;convergence algorithm&amp;quot; is very primitive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56307&quot;&gt;&lt;del&gt;SERVER-56307&lt;/del&gt;&lt;/a&gt; Allow the donor to enter the critical section when the untransferred mods are within a convergence threshold.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/44bdd2c38fd5c80881e15f40e2da6cacf5f35eb4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/44bdd2c38fd5c80881e15f40e2da6cacf5f35eb4&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1776834">SERVER-57634</issuekey>
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            <issuekey id="1683081">SERVER-56185</issuekey>
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