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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-38599] Write downgrade test for two phase drop</title>
                <link>https://jira.mongodb.org/browse/SERVER-38599</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We need to verify that an unfinished 4.2-style two phase drop (defer drop in WT) could be handled nicely on startup of 4.0 binary.&lt;/p&gt;

&lt;p&gt;If an 4.2-style two phase drop is unfinished on the shutdown of 4.2 binary, it means the first phase (dropping metadata in the catalog) is completed (committed but not checkpointed yet - metadata still exists from disk&apos;s perspective) but the second phase (dropping ident in WT) is not. And a &quot;dropCollection&quot; oplog entry is written (committed and persistent on disk in the form of WT journal).&lt;/p&gt;

&lt;p&gt;On the startup of 4.0 binary, MongoDB will start with the last checkpoint which has the original collection and replay the oplog entries including that &quot;dropCollection&quot;. The collection will be dropped with 4.0-style (old way) two phase drop mechanism.4.0 binary does not need to do anything related to the 4.2-style two phase drop in this case.&lt;/p&gt;

&lt;p&gt;This applies to both primary and secondary nodes. This ticket is to write a downgrade test to verify the theory.&lt;/p&gt;</description>
                <environment></environment>
        <key id="653000">SERVER-38599</key>
            <summary>Write downgrade test for two phase drop</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="xiangyu.yao@mongodb.com">Xiangyu Yao</assignee>
                                    <reporter username="benety.goh@mongodb.com">Benety Goh</reporter>
                        <labels>
                    </labels>
                <created>Thu, 13 Dec 2018 15:52:09 +0000</created>
                <updated>Sun, 29 Oct 2023 22:25:46 +0000</updated>
                            <resolved>Thu, 24 Jan 2019 22:36:06 +0000</resolved>
                                                    <fixVersion>4.1.8</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2126677" author="xgen-internal-githook" created="Thu, 24 Jan 2019 22:35:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;xy24&apos;, &apos;email&apos;: &apos;xiangyu.yao@mongodb.com&apos;, &apos;name&apos;: &apos;Xiangyu Yao&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38599&quot; title=&quot;Write downgrade test for two phase drop&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38599&quot;&gt;&lt;del&gt;SERVER-38599&lt;/del&gt;&lt;/a&gt; Write downgrade test for two phase drop&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/29813aa638bd2c6ab55962a63882edac3dcb1032&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/29813aa638bd2c6ab55962a63882edac3dcb1032&lt;/a&gt;&lt;/p&gt;</comment>
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