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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-40459] Optimize the construction of the balancer&apos;s collection distribution status histogram</title>
                <link>https://jira.mongodb.org/browse/SERVER-40459</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;On every round the sharding balancer &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.0.6/src/mongo/db/s/balancer/balancer_chunk_selection_policy_impl.cpp#L65&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;constructs a histogram&lt;/a&gt; of where the chunks are places across the cluster. This histogram is produced through linear scan over all chunks in the chunk manager and because of this as the number of chunks grows, so grows its complexity.&lt;/p&gt;

&lt;p&gt;Without redesigning how this histogram is maintained, we could still get significant performance boost if we switch it to use KeyString like the ChunkManager.&lt;/p&gt;</description>
                <environment></environment>
        <key id="728865">SERVER-40459</key>
            <summary>Optimize the construction of the balancer&apos;s collection distribution status histogram</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="tommaso.tocci@mongodb.com">Tommaso Tocci</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                            <label>ShardingRoughEdges</label>
                            <label>balancer-round-perf</label>
                            <label>high-value</label>
                    </labels>
                <created>Wed, 3 Apr 2019 12:07:38 +0000</created>
                <updated>Thu, 21 Dec 2023 19:51:49 +0000</updated>
                            <resolved>Thu, 19 Oct 2023 17:02:10 +0000</resolved>
                                    <version>4.2.24</version>
                    <version>4.4.24</version>
                    <version>5.0.20</version>
                                    <fixVersion>4.2.25</fixVersion>
                    <fixVersion>4.4.25</fixVersion>
                    <fixVersion>5.0.22</fixVersion>
                    <fixVersion>6.0.11</fixVersion>
                    <fixVersion>7.0.3</fixVersion>
                                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="5855754" author="xgen-internal-githook" created="Mon, 6 Nov 2023 04:15:30 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82325&quot; title=&quot;Config server could invariant during balancer round&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82325&quot;&gt;&lt;del&gt;SERVER-82325&lt;/del&gt;&lt;/a&gt; Config server could invariant during balancer round&lt;/p&gt;

&lt;p&gt;This effectively reverts &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40459&quot; title=&quot;Optimize the construction of the balancer&amp;#39;s collection distribution status histogram&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40459&quot;&gt;&lt;del&gt;SERVER-40459&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 1818719db3009bcc10addd016f08f35c2b6718d8&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f45ff415970f8244303c77a964948630ce3bc93b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f45ff415970f8244303c77a964948630ce3bc93b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5855629" author="xgen-internal-githook" created="Sun, 5 Nov 2023 23:48:49 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82325&quot; title=&quot;Config server could invariant during balancer round&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82325&quot;&gt;&lt;del&gt;SERVER-82325&lt;/del&gt;&lt;/a&gt; Config server could invariant during balancer round&lt;/p&gt;

&lt;p&gt;This effectively reverts &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40459&quot; title=&quot;Optimize the construction of the balancer&amp;#39;s collection distribution status histogram&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40459&quot;&gt;&lt;del&gt;SERVER-40459&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: be9ea3f19e95fc92a6835c9c30381fb29962b45e&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1818719db3009bcc10addd016f08f35c2b6718d8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1818719db3009bcc10addd016f08f35c2b6718d8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5854777" author="xgen-internal-githook" created="Sun, 5 Nov 2023 04:21:20 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82325&quot; title=&quot;Config server could invariant during balancer round&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82325&quot;&gt;&lt;del&gt;SERVER-82325&lt;/del&gt;&lt;/a&gt; Config server could invariant during balancer round&lt;/p&gt;

&lt;p&gt;This effectively reverts &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40459&quot; title=&quot;Optimize the construction of the balancer&amp;#39;s collection distribution status histogram&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40459&quot;&gt;&lt;del&gt;SERVER-40459&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 7a3c2a47cee449b5c02392b08dc5b33265cbe11b&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/be9ea3f19e95fc92a6835c9c30381fb29962b45e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/be9ea3f19e95fc92a6835c9c30381fb29962b45e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5854001" author="xgen-internal-githook" created="Sat, 4 Nov 2023 04:26:36 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82325&quot; title=&quot;Config server could invariant during balancer round&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82325&quot;&gt;&lt;del&gt;SERVER-82325&lt;/del&gt;&lt;/a&gt; Config server could invariant during balancer round&lt;/p&gt;

&lt;p&gt;This effectively reverts &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40459&quot; title=&quot;Optimize the construction of the balancer&amp;#39;s collection distribution status histogram&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40459&quot;&gt;&lt;del&gt;SERVER-40459&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 595d8110122be5b1ca2d951c6f71cd8ecb29b8cb&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7a3c2a47cee449b5c02392b08dc5b33265cbe11b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7a3c2a47cee449b5c02392b08dc5b33265cbe11b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5797535" author="xgen-internal-githook" created="Sun, 22 Oct 2023 04:12:54 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82325&quot; title=&quot;Config server could invariant during balancer round&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82325&quot;&gt;&lt;del&gt;SERVER-82325&lt;/del&gt;&lt;/a&gt; Config server could invariant during balancer round&lt;/p&gt;

&lt;p&gt;This effectively reverts &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40459&quot; title=&quot;Optimize the construction of the balancer&amp;#39;s collection distribution status histogram&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40459&quot;&gt;&lt;del&gt;SERVER-40459&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 5d091b472fa127626698ea9244e3a7fb5f727849&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/595d8110122be5b1ca2d951c6f71cd8ecb29b8cb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/595d8110122be5b1ca2d951c6f71cd8ecb29b8cb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5795708" author="xgen-internal-githook" created="Fri, 20 Oct 2023 17:57:49 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40459&quot; title=&quot;Optimize the construction of the balancer&amp;#39;s collection distribution status histogram&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40459&quot;&gt;&lt;del&gt;SERVER-40459&lt;/del&gt;&lt;/a&gt; Optimize the construction of the balancer&apos;s collection distribution status histogram&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 56f414fe81c8fd7ae2ad87ada1ed0f9cb1299151.&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e6230d4c34ba250a3129ccfa5da06ccbc5b6d536&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e6230d4c34ba250a3129ccfa5da06ccbc5b6d536&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5773677" author="xgen-internal-githook" created="Thu, 12 Oct 2023 14:54:38 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40459&quot; title=&quot;Optimize the construction of the balancer&amp;#39;s collection distribution status histogram&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40459&quot;&gt;&lt;del&gt;SERVER-40459&lt;/del&gt;&lt;/a&gt; Optimise the construction of the balancer&apos;s collection distribution status histogram&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5c793a76207e3f10798a85cff5157982af9c7d77&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5c793a76207e3f10798a85cff5157982af9c7d77&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5744653" author="xgen-internal-githook" created="Mon, 2 Oct 2023 09:32:36 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40459&quot; title=&quot;Optimize the construction of the balancer&amp;#39;s collection distribution status histogram&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40459&quot;&gt;&lt;del&gt;SERVER-40459&lt;/del&gt;&lt;/a&gt; Optimize the construction of the balancer&apos;s collection distribution status histogram&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9b772f346351d9e567e2886ecb4a8cedd7d81ad4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9b772f346351d9e567e2886ecb4a8cedd7d81ad4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5718752" author="xgen-internal-githook" created="Wed, 20 Sep 2023 17:27:04 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40459&quot; title=&quot;Optimize the construction of the balancer&amp;#39;s collection distribution status histogram&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40459&quot;&gt;&lt;del&gt;SERVER-40459&lt;/del&gt;&lt;/a&gt; Optimize the construction of the balancer&apos;s collection distribution status histogram&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/56f414fe81c8fd7ae2ad87ada1ed0f9cb1299151&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/56f414fe81c8fd7ae2ad87ada1ed0f9cb1299151&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5708828" author="xgen-internal-githook" created="Fri, 15 Sep 2023 21:53:22 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40459&quot; title=&quot;Optimize the construction of the balancer&amp;#39;s collection distribution status histogram&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40459&quot;&gt;&lt;del&gt;SERVER-40459&lt;/del&gt;&lt;/a&gt; Restore old behavior for balancing chunks in the No-Zone&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3e18c4c56048ddf22a6872edc111b542521ad1d5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3e18c4c56048ddf22a6872edc111b542521ad1d5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5707931" author="xgen-internal-githook" created="Fri, 15 Sep 2023 17:30:30 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40459&quot; title=&quot;Optimize the construction of the balancer&amp;#39;s collection distribution status histogram&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40459&quot;&gt;&lt;del&gt;SERVER-40459&lt;/del&gt;&lt;/a&gt; Restore old behavior for balancing chunks in the No-Zone&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e352dc0694fed5d04eeff6bf17e1479acc93d679&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e352dc0694fed5d04eeff6bf17e1479acc93d679&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5700723" author="xgen-internal-githook" created="Wed, 13 Sep 2023 13:18:07 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40459&quot; title=&quot;Optimize the construction of the balancer&amp;#39;s collection distribution status histogram&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40459&quot;&gt;&lt;del&gt;SERVER-40459&lt;/del&gt;&lt;/a&gt; Optimise the construction of the balancer&apos;s collection distribution status histogram&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3afe2c1000160a52d8ba90694429ffd6b5a8f40b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3afe2c1000160a52d8ba90694429ffd6b5a8f40b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5700344" author="xgen-internal-githook" created="Wed, 13 Sep 2023 10:25:07 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;58224719+toto-dev@users.noreply.github.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40459&quot; title=&quot;Optimize the construction of the balancer&amp;#39;s collection distribution status histogram&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40459&quot;&gt;&lt;del&gt;SERVER-40459&lt;/del&gt;&lt;/a&gt; Optimise the construction of the balancer&apos;s collection distribution status histogram&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2299c2520d0d410cc645289ee1c8d1de81b1ae88&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2299c2520d0d410cc645289ee1c8d1de81b1ae88&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4507104" author="pierlauro.sciarelli" created="Tue, 26 Apr 2022 16:08:54 +0000"  >&lt;p&gt;Closing this ticket, as mentioned by Kal the referred code is going away under the &quot;no more auto splitter&quot; project.&lt;/p&gt;</comment>
                            <comment id="4349702" author="kaloian.manassiev" created="Fri, 11 Feb 2022 06:12:57 +0000"  >&lt;p&gt;I believe that this ticket will no longer be necessary once we do No More Auto-Splitter, because the balancer will be relying on the data size coming from the Shards and not on chunks.&lt;/p&gt;

&lt;p&gt;CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=pierlauro.sciarelli&quot; class=&quot;user-hover&quot; rel=&quot;pierlauro.sciarelli&quot;&gt;pierlauro.sciarelli&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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                            <issuelinktype id="10010">
                    <name>Duplicate</name>
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            <issuekey id="626548">SERVER-37810</issuekey>
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