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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-30256] Expand testing for initial sync in capped collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-30256</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, capped collections are tested with initial sync with our jstest passthrough tests. However, these tests do not check the equality between a source capped collection and a target capped collection after the cloning process. Ideally, we want to expand the testing to check that initial sync on capped collections produces the expected behavior of having the target collection being an exact replica of the source collection.&lt;/p&gt;</description>
                <environment></environment>
        <key id="406795">SERVER-30256</key>
            <summary>Expand testing for initial sync in capped collections</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="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="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="jason.chan@mongodb.com">Jason Chan</reporter>
                        <labels>
                    </labels>
                <created>Fri, 21 Jul 2017 14:28:05 +0000</created>
                <updated>Tue, 6 Dec 2022 03:56:05 +0000</updated>
                            <resolved>Tue, 10 Apr 2018 15:48:33 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1631712" author="spencer" created="Tue, 25 Jul 2017 21:51:47 +0000"  >&lt;p&gt;Such a test may be difficult/impossible to make stable until/unless &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16049&quot; title=&quot;Replicate capped collection deletes explicitly&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16049&quot;&gt;&lt;del&gt;SERVER-16049&lt;/del&gt;&lt;/a&gt; gets implemented.  Since each replica set member decides when to delete old entries from a capped collection independently, differences in the data layout on disk can result in the nodes having deleting old documents at different times.  This is a known issue with capped collections in replica sets that has been around since the beginning of capped collections and replica sets.&lt;/p&gt;

&lt;p&gt;Given that, I&apos;m not sure it makes sense to invest any time into making a test for this behavior since any such test is likely to be inherently flaky.&lt;/p&gt;</comment>
                            <comment id="1628541" author="judah.schvimer" created="Fri, 21 Jul 2017 14:34:31 +0000"  >&lt;p&gt;Rather than do a dbhash check, we can simply walk through the collection like ReplSetTest.prototype.checkOplogs() to check for equality.&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="68326">SERVER-8972</issuekey>
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            <issuekey id="168240">SERVER-16049</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2055372">SERVER-66775</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="305538">SERVER-25376</issuekey>
        </issuelink>
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