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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-64730] The &apos;forceShardFilteringMetadataRefresh&apos; methods don&apos;t synchronise with each other (5.0 and newer versions)</title>
                <link>https://jira.mongodb.org/browse/SERVER-64730</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e9c70c962b4fce236da2c85cdfa38635a436cc3d/src/mongo/db/s/shard_filtering_metadata_refresh.h#L81&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;forceShardFilteringMetadataRefresh&lt;/tt&gt;&lt;/a&gt; method is the lowest-level shard version causality utility on the shards, whose purpose is to always move the shard version forward.&lt;/p&gt;

&lt;p&gt;In versions 4.0 and earlier, it used to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.0.28/src/mongo/db/s/shard_filtering_metadata_refresh.cpp#L174&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;acquire collection X lock and check that the newly installed version is actually newer than the one on the CSS&lt;/a&gt; before installing it. Starting from version 4.2 though, as part of the transaction project &lt;a href=&quot;https://github.com/mongodb/mongo/commit/0d07bf5e7a72a5bce3f7d7d681a71d7ecfe7eb8c#diff-19122889349748518415f5a3a503a7028e13b10f1cf41db437806cbc4c471a80L184&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;it was changed&lt;/a&gt; to not acquire collection X-lock.&lt;/p&gt;

&lt;p&gt;This means that two concurrent invocations of &lt;tt&gt;forceShardFilteringMetadataRefresh&lt;/tt&gt; could potentially race with each other and install non-monotonous increasing versions (i.e., the shard version on a shard can go back in time).&lt;/p&gt;

&lt;p&gt;&lt;b&gt;&lt;ins&gt;UPDATE&lt;/ins&gt;&lt;/b&gt;&lt;br/&gt;
After working a bit on this ticket and backporting it to previous versions. we believe it has already been addressed in 5.0 and newer versions (see the fix version to understand in which minor version the fix landed). Long story short, when a DDL operation is installing new metadata using the critical section, we cancel any ongoing &lt;tt&gt;onShardVersionMismatch&lt;/tt&gt; metadata refresh, so we don&apos;t have to worry about the interleaving of these two operations. Note that any &lt;tt&gt;onShardVersionMismatch&lt;/tt&gt; that arrives after the critical section is acquired will block behind it. The same happens when we clear the filtering metadata.&lt;/p&gt;

&lt;p&gt;The versions that still have this bug are 4.4 and 4.2. I propose to perform an investigation about these two versions and open a new ticket about how to fix it. Sending it to Needs Scheduling so we properly triage this task. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-72322&quot; title=&quot;The &amp;#39;forceShardFilteringMetadataRefresh&amp;#39; methods don&amp;#39;t synchronise with each other (4.4 and 4.2 only)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-72322&quot;&gt;SERVER-72322&lt;/a&gt; will track this issue on 4.4 and 4.2 branches.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2005422">SERVER-64730</key>
            <summary>The &apos;forceShardFilteringMetadataRefresh&apos; methods don&apos;t synchronise with each other (5.0 and newer versions)</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="backlog-server-sharding-emea">[DO NOT USE] Backlog - Sharding EMEA</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Mon, 21 Mar 2022 12:32:06 +0000</created>
                <updated>Sun, 29 Oct 2023 21:40:49 +0000</updated>
                            <resolved>Wed, 21 Dec 2022 17:02:58 +0000</resolved>
                                    <version>5.0.5</version>
                    <version>5.1.1</version>
                    <version>4.2.19</version>
                    <version>5.2.1</version>
                    <version>4.4.13</version>
                    <version>5.3.0-rc4</version>
                                    <fixVersion>6.1.1</fixVersion>
                    <fixVersion>5.0.14</fixVersion>
                    <fixVersion>6.0.2</fixVersion>
                    <fixVersion>6.2.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="5061394" author="thomas.schubert" created="Fri, 16 Dec 2022 21:13:26 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sergi.mateo-bellido%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;sergi.mateo-bellido@mongodb.com&quot;&gt;sergi.mateo-bellido@mongodb.com&lt;/a&gt;, could you clarify the status of this ticket and where this issue is resolved for me?&lt;/p&gt;

&lt;p&gt;It&apos;s currently open, but I see a lot of commits and fixversions.&lt;/p&gt;</comment>
                            <comment id="4900558" author="xgen-internal-githook" created="Thu, 13 Oct 2022 12:31:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Sergi Mateo Bellido&apos;, &apos;email&apos;: &apos;sergi.mateo-bellido@mongodb.com&apos;, &apos;username&apos;: &apos;smateo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64730&quot; title=&quot;The &amp;#39;forceShardFilteringMetadataRefresh&amp;#39; methods don&amp;#39;t synchronise with each other (5.0 and newer versions)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64730&quot;&gt;&lt;del&gt;SERVER-64730&lt;/del&gt;&lt;/a&gt; Interrupt ongoing refreshes after entering into the critical section&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 343108041c5b3570e97418ee3204804535fbde4d)&lt;br/&gt;
Branch: v6.1&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7841ccaf02170df756499cbe3258171e4567db45&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7841ccaf02170df756499cbe3258171e4567db45&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4871814" author="xgen-internal-githook" created="Mon, 3 Oct 2022 07:22:32 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Sergi Mateo Bellido&apos;, &apos;email&apos;: &apos;sergi.mateo-bellido@mongodb.com&apos;, &apos;username&apos;: &apos;smateo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64730&quot; title=&quot;The &amp;#39;forceShardFilteringMetadataRefresh&amp;#39; methods don&amp;#39;t synchronise with each other (5.0 and newer versions)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64730&quot;&gt;&lt;del&gt;SERVER-64730&lt;/del&gt;&lt;/a&gt; Interrupt ongoing refreshes after entering into the critical section&lt;/p&gt;

&lt;p&gt;Minor changes to resharding_test_fixture to work with legacy OP_QUERY&lt;br/&gt;
(cherry picked from commit 343108041c5b3570e97418ee3204804535fbde4d)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c2a779e969333570bcaa7c8f03a59a27c5250d15&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c2a779e969333570bcaa7c8f03a59a27c5250d15&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4825154" author="xgen-internal-githook" created="Wed, 14 Sep 2022 10:27:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Sergi Mateo Bellido&apos;, &apos;email&apos;: &apos;sergi.mateo-bellido@mongodb.com&apos;, &apos;username&apos;: &apos;smateo&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64730&quot; title=&quot;The &amp;#39;forceShardFilteringMetadataRefresh&amp;#39; methods don&amp;#39;t synchronise with each other (5.0 and newer versions)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64730&quot;&gt;&lt;del&gt;SERVER-64730&lt;/del&gt;&lt;/a&gt; Interrupt ongoing refreshes after entering into the critical section&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit e5de2ad1815d9a9a6a0783c520985cdb0d2a3f06.&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d23fde882fbf40b56b906a25d4f1a9c127574b99&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d23fde882fbf40b56b906a25d4f1a9c127574b99&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4824945" author="xgen-internal-githook" created="Wed, 14 Sep 2022 08:35:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Sergi Mateo Bellido&apos;, &apos;email&apos;: &apos;sergi.mateo-bellido@mongodb.com&apos;, &apos;username&apos;: &apos;smateo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64730&quot; title=&quot;The &amp;#39;forceShardFilteringMetadataRefresh&amp;#39; methods don&amp;#39;t synchronise with each other (5.0 and newer versions)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64730&quot;&gt;&lt;del&gt;SERVER-64730&lt;/del&gt;&lt;/a&gt; Interrupt ongoing refreshes after entering into the critical section&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 343108041c5b3570e97418ee3204804535fbde4d)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c94a993632dccda780e233f9e19f943c2a4f1707&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c94a993632dccda780e233f9e19f943c2a4f1707&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4824911" author="xgen-internal-githook" created="Wed, 14 Sep 2022 08:17:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Sergi Mateo Bellido&apos;, &apos;email&apos;: &apos;sergi.mateo-bellido@mongodb.com&apos;, &apos;username&apos;: &apos;smateo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64730&quot; title=&quot;The &amp;#39;forceShardFilteringMetadataRefresh&amp;#39; methods don&amp;#39;t synchronise with each other (5.0 and newer versions)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64730&quot;&gt;&lt;del&gt;SERVER-64730&lt;/del&gt;&lt;/a&gt; Interrupt ongoing refreshes after entering into the critical section&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 343108041c5b3570e97418ee3204804535fbde4d)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e5de2ad1815d9a9a6a0783c520985cdb0d2a3f06&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e5de2ad1815d9a9a6a0783c520985cdb0d2a3f06&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4809286" author="xgen-internal-githook" created="Wed, 7 Sep 2022 19:16:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Sergi Mateo Bellido&apos;, &apos;email&apos;: &apos;sergi.mateo-bellido@mongodb.com&apos;, &apos;username&apos;: &apos;smateo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64730&quot; title=&quot;The &amp;#39;forceShardFilteringMetadataRefresh&amp;#39; methods don&amp;#39;t synchronise with each other (5.0 and newer versions)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64730&quot;&gt;&lt;del&gt;SERVER-64730&lt;/del&gt;&lt;/a&gt; Interrupt ongoing refreshes after entering into the critical section&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/343108041c5b3570e97418ee3204804535fbde4d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/343108041c5b3570e97418ee3204804535fbde4d&lt;/a&gt;&lt;/p&gt;</comment>
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