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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-83530] Handle QueryPlanKilled on shard_server_catalog_cache_loader_test unit test</title>
                <link>https://jira.mongodb.org/browse/SERVER-83530</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;ShardServerCatalogCacheLoader::getChunkSince can throw StaleConfig under some interleavings between reading the cache and the background thread that persists the materialized cache. In practice, the CatalogCache &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7593e97db8929618424cd48b4c720044678a96d4/src/mongo/s/catalog_cache.cpp#L457&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;handles this by retrying&lt;/a&gt;, so it doesn&apos;t cause harm.&lt;br/&gt;
However, this race can cause failures on the shard_server_catalog_cache_loader_test unit test (e.g &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6cba8510537902bb55ca000064616ed2d61b06ce/src/mongo/db/s/shard_server_catalog_cache_loader_test.cpp#L614&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;). We can address this by making the test expect and retry this failure. Alternatively, we could make ShardServerCatalogCacheLoader retry itself.&lt;/p&gt;

&lt;p&gt;The interleaving that can cause this is:&lt;br/&gt;
1. SSCCL &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6cba8510537902bb55ca000064616ed2d61b06ce/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L764-L765&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;discovers&lt;/a&gt; the new epoch.&lt;br/&gt;
2. Next, it &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6cba8510537902bb55ca000064616ed2d61b06ce/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L803-L806&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;schedules&lt;/a&gt; an asynchronous task to update the persisted metadata.&lt;br/&gt;
3. Next, it &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6cba8510537902bb55ca000064616ed2d61b06ce/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L826-L827&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;calls `_getLoaderMetadata`&lt;/a&gt;, which &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6cba8510537902bb55ca000064616ed2d61b06ce/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L924-L925&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;calls `getIncompletePersistedMetadataSinceVersion`&lt;/a&gt;, which &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6cba8510537902bb55ca000064616ed2d61b06ce/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L322-L323&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;calls `getPersistedMetadataSinceVersion`&lt;/a&gt;, which finally &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6cba8510537902bb55ca000064616ed2d61b06ce/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L291-L297&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;calls `readShardChunks`&lt;/a&gt;. readShardChunks reads from the config.cache.xxxx collection.&lt;br/&gt;
4. Concurrently with the read (3), the task scheduled at (2) proceeds to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6cba8510537902bb55ca000064616ed2d61b06ce/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L171&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;drop the config.cache.xxxx collection&lt;/a&gt; (because the epoch has changed).&lt;br/&gt;
5. The read started at (3) yields and on restore it discovers that the collection no longer exists, therefore it fails with QueryPlanKilled.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2507297">SERVER-83530</key>
            <summary>Handle QueryPlanKilled on shard_server_catalog_cache_loader_test unit test</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="david.dominguez@mongodb.com">David Dominguez Sal</assignee>
                                    <reporter username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</reporter>
                        <labels>
                    </labels>
                <created>Wed, 22 Nov 2023 13:19:32 +0000</created>
                <updated>Wed, 31 Jan 2024 11:17:58 +0000</updated>
                            <resolved>Thu, 21 Dec 2023 15:31:16 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5966144" author="xgen-internal-githook" created="Thu, 21 Dec 2023 16:32:34 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;david-dominguez-sal&apos;, &apos;email&apos;: &apos;97509688+david-dominguez-sal@users.noreply.github.com&apos;, &apos;username&apos;: &apos;david-dominguez-sal&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-83530&quot; title=&quot;Handle QueryPlanKilled on shard_server_catalog_cache_loader_test unit test&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-83530&quot;&gt;&lt;del&gt;SERVER-83530&lt;/del&gt;&lt;/a&gt;: Fix shard_server_catalog_cache_loader_test. Retry on recoverable errors the usages of getChunksSince. (#17657)&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 6a84385455be57880336ab8c2329825b52c24a72&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d1f998f81838f79006f5b8c59e3ba5ac5e6096d2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d1f998f81838f79006f5b8c59e3ba5ac5e6096d2&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2562417">SERVER-86013</issuekey>
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