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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-54394] Remove flag to avoid using snapshot read concern in ConfigServerCatalogCacheLoader on unit_tests</title>
                <link>https://jira.mongodb.org/browse/SERVER-54394</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54874&quot; title=&quot;Ensure reading of consistent config.collections and config.chunks when refreshing the CatalogCache&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54874&quot;&gt;&lt;del&gt;SERVER-54874&lt;/del&gt;&lt;/a&gt; we modified the ConfigServerCatalogCache to refresh using an aggregation pipeline and snapshot read concern.&lt;/p&gt;

&lt;p&gt;However, the&#160;ephemeral_for_test_kv_engine storage engine doesn&apos;t currently support snapshot read concern (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48314&quot; title=&quot;ephemeralForTest should support timestamps&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48314&quot;&gt;&lt;del&gt;SERVER-48314&lt;/del&gt;&lt;/a&gt;). The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7d63d668f001f63672905e8d5f63275c09ba84cd/src/mongo/db/s/sharding_mongod_test_fixture.h#L48&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ShardingMongodTestFixture&lt;/a&gt; uses the ephimeralForTesting storage engine, so the unit tests that involved refreshing the cache with snapshot read concern would fail. Temporarily, to address this &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53105&quot; title=&quot;Remove namespace field from config.chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53105&quot;&gt;&lt;del&gt;SERVER-53105&lt;/del&gt;&lt;/a&gt; added a flag to avoid using snapshot read concern for the refresh and instead use localReadConcern. This flag is only enabled on unit tests.&lt;/p&gt;

&lt;p&gt;This ticket is to remove this flag and use snapshotReadConcern in all cases. This can be done once &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48314&quot; title=&quot;ephemeralForTest should support timestamps&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48314&quot;&gt;&lt;del&gt;SERVER-48314&lt;/del&gt;&lt;/a&gt; is done. Alternatively, we could consider using the wiredTiger storage engine in ShardingMongodTestFixture.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1616263">SERVER-54394</key>
            <summary>Remove flag to avoid using snapshot read concern in ConfigServerCatalogCacheLoader on unit_tests</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="gregory.noma@mongodb.com">Gregory Noma</assignee>
                                    <reporter username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</reporter>
                        <labels>
                    </labels>
                <created>Mon, 8 Feb 2021 16:42:29 +0000</created>
                <updated>Sun, 29 Oct 2023 21:57:47 +0000</updated>
                            <resolved>Tue, 3 May 2022 14:31:47 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4522544" author="xgen-internal-githook" created="Tue, 3 May 2022 14:28:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Noma&apos;, &apos;email&apos;: &apos;gregory.noma@gmail.com&apos;, &apos;username&apos;: &apos;gregorynoma&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54394&quot; title=&quot;Remove flag to avoid using snapshot read concern in ConfigServerCatalogCacheLoader on unit_tests&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54394&quot;&gt;&lt;del&gt;SERVER-54394&lt;/del&gt;&lt;/a&gt; Remove `setAvoidSnapshotForRefresh_ForTest`&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fe08161c8c50c5fc2ea245ca248a7a05f9c3cdc6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fe08161c8c50c5fc2ea245ca248a7a05f9c3cdc6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3651426" author="JIRAUSER1257318" created="Mon, 8 Mar 2021 09:22:35 +0000"  >&lt;p&gt;Reopening since as part of&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54874&quot; title=&quot;Ensure reading of consistent config.collections and config.chunks when refreshing the CatalogCache&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54874&quot;&gt;&lt;del&gt;SERVER-54874&lt;/del&gt;&lt;/a&gt;&#160;we refresh the catalog cache using an aggregation with snapshot read concern.&lt;/p&gt;</comment>
                            <comment id="3616715" author="JIRAUSER1257318" created="Tue, 16 Feb 2021 11:51:40 +0000"  >&lt;p&gt;Closing as &apos;Won&apos;t do&apos; since in the end we did not implement the snapshot read in&#160;ConfigServerCatalogCache as part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53105&quot; title=&quot;Remove namespace field from config.chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53105&quot;&gt;&lt;del&gt;SERVER-53105&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
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                    <name>Depends</name>
                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="1356702">SERVER-48314</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
                            <issuelinktype id="10520">
                    <name>Problem/Incident</name>
                                            <outwardlinks description="causes">
                                        <issuelink>
            <issuekey id="2043779">SERVER-66361</issuekey>
        </issuelink>
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