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    <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-77631] Break up changeReadSourceIfNeeded into shouldReadAtLastApplied and changeReadSource</title>
                <link>https://jira.mongodb.org/browse/SERVER-77631</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;tt&gt;SnapshotHelper::changeReadSourceIfNeeded&lt;/tt&gt; checks whether we should read at &lt;tt&gt;lastApplied&lt;/tt&gt; based on some global context and the NSS we are acquiring, then performs that change if needed.&lt;/p&gt;

&lt;p&gt;In the new API we can acquire multiple collections at once, we should first check whether we should read at last applied based on the global context, then make sure all NSSs we are acquiring are compatible with last applied, and lastly make the change.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2354825">SERVER-77631</key>
            <summary>Break up changeReadSourceIfNeeded into shouldReadAtLastApplied and changeReadSource</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-catalog-and-routing">Backlog - Catalog and Routing</assignee>
                                    <reporter username="daniel.gomezferro@mongodb.com">Daniel Gomez Ferro</reporter>
                        <labels>
                            <label>PM-2144-StorEx-Cleanup</label>
                            <label>car-qw</label>
                    </labels>
                <created>Wed, 31 May 2023 15:22:11 +0000</created>
                <updated>Thu, 25 Jan 2024 10:57:12 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5495541" author="JIRAUSER1263153" created="Tue, 13 Jun 2023 15:20:41 +0000"  >&lt;p&gt;Nothing bad should happen immediately, but this is tech-debt. The current code in &lt;tt&gt;SnapshotHelper::changeReadSourceIfNeeded&lt;/tt&gt; processes one NSS at once, checking whether we are allowed to change the read source, if we should change it and then making the change. Since we can acquire multiple collections at once now, we should should refactor the logic to handle all NSSs at once instead of performing redundant checks for every NSSs and possibly going back and forth on whether to change the readsource or not.&lt;/p&gt;</comment>
                            <comment id="5495303" author="kaloian.manassiev" created="Tue, 13 Jun 2023 14:29:50 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=daniel.gomezferro%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;daniel.gomezferro@mongodb.com&quot;&gt;daniel.gomezferro@mongodb.com&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=henrik.edin%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;henrik.edin@mongodb.com&quot;&gt;henrik.edin@mongodb.com&lt;/a&gt;, can you guys write some evaluation of what happens if we don&apos;t do this? Basically looking for next steps of what needs to happen here.&lt;/p&gt;</comment>
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