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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-48069] Switch OplogApplierImplTest to use WiredTiger</title>
                <link>https://jira.mongodb.org/browse/SERVER-48069</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;ephemeralForTest cursors are not thread_safe (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42213&quot; title=&quot;ephemeralForTest cursors need to be made thread_safe&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42213&quot;&gt;&lt;del&gt;SERVER-42213&lt;/del&gt;&lt;/a&gt;). So &lt;tt&gt;fillWriterVectors&lt;/tt&gt; could race with oplog insertions when trying to &lt;tt&gt;readTransactionOperationsFromOplogChain&lt;/tt&gt;. We switched idempotency tests to use WiredTiger in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45288&quot; title=&quot;switch Idempotency tests to use WiredTiger instead of ephemeralForTest&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45288&quot;&gt;&lt;del&gt;SERVER-45288&lt;/del&gt;&lt;/a&gt;. I think we may need to do the same for all OplogApplierImplTest in general.&lt;/p&gt;

&lt;p&gt;We should be careful with oplog visibility issues though after switching to WiredTiger.&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42925&quot; title=&quot;idempotency tests have oplog visiblity issues&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42925&quot;&gt;&lt;del&gt;SERVER-42925&lt;/del&gt;&lt;/a&gt;&#160;fixed oplog visiblity issues in idempotency tests by introducing&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/2ffaa9d4efefffc7045b6b47d9380299b28dfd7a/src/mongo/db/repl/oplog_applier_impl_test_fixture.cpp#L278-L280&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;an&#160;&lt;tt&gt;oplogDiskLocRegister&lt;/tt&gt;&#160;call&lt;/a&gt;&#160;to update the oplog visibility timestamp after applying each batch. But in non-idempotency tests like this&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/2ffaa9d4efefffc7045b6b47d9380299b28dfd7a/src/mongo/db/repl/oplog_applier_impl_test.cpp#L709&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;one&lt;/a&gt;, we call&#160;&lt;tt&gt;applyOplogBatch&lt;/tt&gt;&#160;directly which I believe doesn&apos;t update the oplog visibility timestamp.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1345269">SERVER-48069</key>
            <summary>Switch OplogApplierImplTest to use WiredTiger</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="lingzhi.deng@mongodb.com">Lingzhi Deng</assignee>
                                    <reporter username="lingzhi.deng@mongodb.com">Lingzhi Deng</reporter>
                        <labels>
                    </labels>
                <created>Sat, 9 May 2020 00:16:20 +0000</created>
                <updated>Thu, 14 May 2020 20:28:26 +0000</updated>
                            <resolved>Thu, 14 May 2020 20:28:26 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="3088017" author="lingzhi.deng" created="Thu, 14 May 2020 20:28:26 +0000"  >&lt;p&gt;Marking this as &quot;Won&apos;t fix&quot; for now given the low value and the relatively high risk of destabilizing older versions builds.&lt;/p&gt;</comment>
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