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    <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-67686] collMod coordinator must block migration on bucket nss (2nd attempt)</title>
                <link>https://jira.mongodb.org/browse/SERVER-67686</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently the collMod coordinator blocks and resume migrations as part of its coordination.&lt;/p&gt;

&lt;p&gt;In case of sharded timeseries collection we should block migrations on the bucket namespace rather than the view namespace associated with the timeseries collection&lt;/p&gt;

&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67399&quot; title=&quot;collMod coordinator must block migration on bucket nss&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67399&quot;&gt;&lt;del&gt;SERVER-67399&lt;/del&gt;&lt;/a&gt; I tried to fix this by just blocking migrations on the targeting namespace.&lt;br/&gt;
Unfortunately I needed to revert the simple fix because I discovered that the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3851a4a152a99a143b7d4074c9012f98a11c7ad6/src/mongo/db/s/collmod_coordinator.cpp#L178-L202&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;kBlockShards phase &lt;/a&gt;&#160; of the collMod cooridnator is not idempotent because it performs the following steps:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/3851a4a152a99a143b7d4074c9012f98a11c7ad6/src/mongo/db/s/collmod_coordinator.cpp#L191&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;blocks migrations &lt;/a&gt; for the specific collection&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/3851a4a152a99a143b7d4074c9012f98a11c7ad6/src/mongo/db/s/collmod_coordinator.cpp#L200&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;acquire the collection critical section&lt;/a&gt; on all participant shard.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;In case we already performed 2. we can&apos;t re-execute 1. because stopping migrations will serialize with the collection critical section taken by 2.&lt;/p&gt;

&lt;p&gt;In fact as part of blocking migrations &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3851a4a152a99a143b7d4074c9012f98a11c7ad6/src/mongo/db/s/config/sharding_catalog_manager_chunk_operations.cpp#L1882-L1886&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;we send a {_flushRoutingTableCacheUpdates} to all the shards&lt;/a&gt; that in turn &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3851a4a152a99a143b7d4074c9012f98a11c7ad6/src/mongo/db/s/flush_routing_table_cache_updates_command.cpp#L133-L134&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;blocks behind the acquired critical section&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2080176">SERVER-67686</key>
            <summary>collMod coordinator must block migration on bucket nss (2nd attempt)</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="tommaso.tocci@mongodb.com">Tommaso Tocci</assignee>
                                    <reporter username="tommaso.tocci@mongodb.com">Tommaso Tocci</reporter>
                        <labels>
                            <label>shardingemea-qw</label>
                    </labels>
                <created>Thu, 30 Jun 2022 09:04:20 +0000</created>
                <updated>Sun, 29 Oct 2023 21:36:11 +0000</updated>
                            <resolved>Mon, 25 Jul 2022 12:37:16 +0000</resolved>
                                    <version>6.0.0-rc12</version>
                                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4701371" author="xgen-internal-githook" created="Mon, 25 Jul 2022 11:40:20 +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-67686&quot; title=&quot;collMod coordinator must block migration on bucket nss (2nd attempt)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67686&quot;&gt;&lt;del&gt;SERVER-67686&lt;/del&gt;&lt;/a&gt; collMod coordinator must block migration on bucket nss (2nd attempt)&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1b4355473c026de8d49692ac32250bca0381c918&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1b4355473c026de8d49692ac32250bca0381c918&lt;/a&gt;&lt;/p&gt;</comment>
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                    <name>Problem/Incident</name>
                                            <outwardlinks description="causes">
                                        <issuelink>
            <issuekey id="2119167">SERVER-69038</issuekey>
        </issuelink>
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