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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-33794] queryOnce should not call obtainMajorityCommittedSnapshot if it&apos;s a standalone node</title>
                <link>https://jira.mongodb.org/browse/SERVER-33794</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33609&quot; title=&quot;Pass readConcernLevel to Wiredtiger Recovery Unit&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33609&quot;&gt;&lt;del&gt;SERVER-33609&lt;/del&gt;&lt;/a&gt;, setReadFromMajorityCommittedSnapshot() was refactored into two functions: setReadConcernLevelAndReplicationMode() and obtainMajorityCommittedSnapshot().&lt;/p&gt;

&lt;p&gt;setReadConcernLevelAndReplicationMode() should be called to set the readConcern level in the recovery unit. It should be called at the early stage of an operation.&lt;/p&gt;

&lt;p&gt;obtainMajorityCommittedSnapshot() is simply a function that refreshes the majorityCommittedSnapshot. It should only be called when we have &quot;majority&quot; or &quot;snapshot&quot; readConcern and replicationMode being modeReplSet.&lt;/p&gt;

&lt;p&gt;However, while running some sharding tests, in rs_local_client&apos;s queryOnce function, we could have readConcernLevel being &quot;majority&apos; while replicationMode being none (standalone node). I fixed those tests by manually setting the replicationMode to be replSet so we can call obtainMajorityCommittedSnapshot(). Another potential fix might be ignoring the standalone case? I am not sure what this function really wants here so I am creating this ticket for further fixes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="508960">SERVER-33794</key>
            <summary>queryOnce should not call obtainMajorityCommittedSnapshot if it&apos;s a standalone node</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="3">Duplicate</resolution>
                                        <assignee username="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="xiangyu.yao@mongodb.com">Xiangyu Yao</reporter>
                        <labels>
                    </labels>
                <created>Fri, 9 Mar 2018 22:08:36 +0000</created>
                <updated>Wed, 16 May 2018 15:23:45 +0000</updated>
                            <resolved>Wed, 16 May 2018 15:23:37 +0000</resolved>
                                    <version>3.6.3</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1892935" author="renctan" created="Wed, 16 May 2018 15:23:37 +0000"  >&lt;p&gt;This is no longer needed because of the changes made by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34443&quot; title=&quot;Refactor how WiredTigerRecoveryUnit and WiredTigerSnapshotManager begin transactions at points in time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34443&quot;&gt;&lt;del&gt;SERVER-34443&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="1875117" author="renctan" created="Thu, 26 Apr 2018 16:11:41 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kaloian.manassiev&quot; class=&quot;user-hover&quot; rel=&quot;kaloian.manassiev&quot;&gt;kaloian.manassiev&lt;/a&gt; I don&apos;t think it&apos;s important to fix this issue right way. However, I&apos;m worried about the implications of setting the replication mode of the recovery unit to replSet even though it&apos;s not one. I think the code in queryOnce should just change the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.7.7/src/mongo/s/client/rs_local_client.cpp#L108&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;condition&lt;/a&gt; to include that it is a replica set, just like how the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.7.7/src/mongo/db/read_concern.cpp#L319&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;read concern&lt;/a&gt; handles it.&lt;/p&gt;</comment>
                            <comment id="1859807" author="kaloian.manassiev" created="Mon, 9 Apr 2018 22:14:03 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=renctan&quot; class=&quot;user-hover&quot; rel=&quot;renctan&quot;&gt;renctan&lt;/a&gt;, given that we are moving away from allowing standalone sharded components, is there a point in fixing this?&lt;/p&gt;</comment>
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