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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-57102] Fixing invariants on ShardServerCatalogCacheLoader to consider different terms</title>
                <link>https://jira.mongodb.org/browse/SERVER-57102</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/a603516c55a06b1e94a62b4fc693d5fe2ec2c274/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L1362-L1383&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;These two invariants of the &lt;tt&gt;ShardServerCatalogCacheLoader&lt;/tt&gt;&lt;/a&gt; verify that the &lt;tt&gt;ChunkVersions&lt;/tt&gt; of the last task is contiguous to the &lt;tt&gt;ChunkVersions&lt;/tt&gt; of the new task. However these invariants are incomplete: they do not properly cover scenarios in which there are stepdowns/stepups.&lt;/p&gt;

&lt;p&gt;Note that when a new node &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a603516c55a06b1e94a62b4fc693d5fe2ec2c274/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L433-L436&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;is elected as primary it bumps its term&lt;/a&gt;. This is important because it changes how the &lt;tt&gt;minQueryVersion&lt;/tt&gt; is computed: instead of &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a603516c55a06b1e94a62b4fc693d5fe2ec2c274/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L667-L668&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;looking at the in-memory list of tasks associated with the previous term&lt;/a&gt; (i.e., last time this node was primary) we end up taking as &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a603516c55a06b1e94a62b4fc693d5fe2ec2c274/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L674-L675&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;minQueryVersion&lt;/tt&gt; whatever version is persisted on &lt;tt&gt;config.cache.chunks&lt;/tt&gt;&lt;/a&gt;. However, when we add this new task to the list, the implementation&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/a603516c55a06b1e94a62b4fc693d5fe2ec2c274/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L1360&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;does not consider the terms&lt;/a&gt; and ends up comparing versions that are not contiguous: the &lt;tt&gt;maxQueryVersion&lt;/tt&gt; of the last task is different than the &lt;tt&gt;minQueryVersion&lt;/tt&gt; of the new task.&lt;/p&gt;

&lt;p&gt;The proposed solution is to avoid comparing tasks of different terms.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1738461">SERVER-57102</key>
            <summary>Fixing invariants on ShardServerCatalogCacheLoader to consider different terms</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="antonio.fuschetto@mongodb.com">Antonio Fuschetto</assignee>
                                    <reporter username="antonio.fuschetto@mongodb.com">Antonio Fuschetto</reporter>
                        <labels>
                    </labels>
                <created>Thu, 20 May 2021 20:03:41 +0000</created>
                <updated>Sun, 29 Oct 2023 21:53:15 +0000</updated>
                            <resolved>Tue, 25 May 2021 13:14:01 +0000</resolved>
                                                    <fixVersion>4.0.25</fixVersion>
                    <fixVersion>4.2.15</fixVersion>
                    <fixVersion>4.4.7</fixVersion>
                    <fixVersion>5.0.0-rc1</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4108204" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 19:00:04 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3847054" author="xgen-internal-githook" created="Fri, 28 May 2021 08:11:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Antonio Fuschetto&apos;, &apos;email&apos;: &apos;antonio.fuschetto@mongodb.com&apos;, &apos;username&apos;: &apos;afuschetto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57102&quot; title=&quot;Fixing invariants on ShardServerCatalogCacheLoader to consider different terms&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57102&quot;&gt;&lt;del&gt;SERVER-57102&lt;/del&gt;&lt;/a&gt; Fixing invariants on ShardServerCatalogCacheLoader to consider different terms&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a6d55fca3a30a7f41e78904a4a851f1bd6ed8d02&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a6d55fca3a30a7f41e78904a4a851f1bd6ed8d02&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3847053" author="xgen-internal-githook" created="Fri, 28 May 2021 08:11:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Antonio Fuschetto&apos;, &apos;email&apos;: &apos;antonio.fuschetto@mongodb.com&apos;, &apos;username&apos;: &apos;afuschetto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57102&quot; title=&quot;Fixing invariants on ShardServerCatalogCacheLoader to consider different terms&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57102&quot;&gt;&lt;del&gt;SERVER-57102&lt;/del&gt;&lt;/a&gt; Fixing invariants on ShardServerCatalogCacheLoader to consider different terms&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b0a976653a626bb469754e658c978635fae87c8a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b0a976653a626bb469754e658c978635fae87c8a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3847044" author="xgen-internal-githook" created="Fri, 28 May 2021 08:01:21 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Antonio Fuschetto&apos;, &apos;email&apos;: &apos;antonio.fuschetto@mongodb.com&apos;, &apos;username&apos;: &apos;afuschetto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57102&quot; title=&quot;Fixing invariants on ShardServerCatalogCacheLoader to consider different terms&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57102&quot;&gt;&lt;del&gt;SERVER-57102&lt;/del&gt;&lt;/a&gt; Fixing invariants on ShardServerCatalogCacheLoader to consider different terms&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/84f7b6bfd558d61d6fa137f723c15d086d38157c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/84f7b6bfd558d61d6fa137f723c15d086d38157c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3847023" author="xgen-internal-githook" created="Fri, 28 May 2021 07:32:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Antonio Fuschetto&apos;, &apos;email&apos;: &apos;antonio.fuschetto@mongodb.com&apos;, &apos;username&apos;: &apos;afuschetto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57102&quot; title=&quot;Fixing invariants on ShardServerCatalogCacheLoader to consider different terms&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57102&quot;&gt;&lt;del&gt;SERVER-57102&lt;/del&gt;&lt;/a&gt; Fixing invariants on ShardServerCatalogCacheLoader to consider different terms&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bff57b9b502c98b0d650c46e0a82f5f9c06e71bc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bff57b9b502c98b0d650c46e0a82f5f9c06e71bc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3836111" author="xgen-internal-githook" created="Tue, 25 May 2021 11:18:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Antonio Fuschetto&apos;, &apos;email&apos;: &apos;antonio.fuschetto@mongodb.com&apos;, &apos;username&apos;: &apos;afuschetto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57102&quot; title=&quot;Fixing invariants on ShardServerCatalogCacheLoader to consider different terms&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57102&quot;&gt;&lt;del&gt;SERVER-57102&lt;/del&gt;&lt;/a&gt; Fixing invariants on ShardServerCatalogCacheLoader to consider different terms&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ccf49333014283cf0d339c92f5af9afa74d6d362&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ccf49333014283cf0d339c92f5af9afa74d6d362&lt;/a&gt;&lt;/p&gt;</comment>
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