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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-42070] Print the actual diff in collStats output when checkDBHashesForReplSet() detects collStats discrepancy</title>
                <link>https://jira.mongodb.org/browse/SERVER-42070</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, the RollbackFuzzer calls dumpCollectionDiff() when it detects a mismatch in collection stats for any of the fields &quot;capped&quot;, &quot;nindexes&quot;, or &quot;ns&quot;.  It does not, however, tell you which of the fields actually had a mismatch, and the dumpCollectionDiff() function only shows collection document differences anyway.&lt;br/&gt;
I don&apos;t think it&apos;s helpful to call dumpCollectionDiff() for this failure case.  Instead, it should just display the output of collStats for each node, and also display the actual fields that triggered the problem.  The output of collStats is enormous and is output to a single line, making a determination of the failure reason unusually difficult.&lt;/p&gt;

&lt;p&gt;You can see an example of this in &lt;a href=&quot;https://logkeeper.mongodb.org/build/222903c574e9dc03a763ab16015f31f8/test/5d1a64fec2ab684c9109a185?html=1#L20988&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://logkeeper.mongodb.org/build/222903c574e9dc03a763ab16015f31f8/test/5d1a64fec2ab684c9109a185?html=1#L20988&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="834520">SERVER-42070</key>
            <summary>Print the actual diff in collStats output when checkDBHashesForReplSet() detects collStats discrepancy</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-stm">Backlog - Server Tooling and Methods (STM)</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                            <label>tig-mongorunner</label>
                            <label>tig-qwin-eligible</label>
                    </labels>
                <created>Wed, 3 Jul 2019 17:00:43 +0000</created>
                <updated>Tue, 6 Dec 2022 02:54:51 +0000</updated>
                                                                            <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4540012" author="steven.vannelli" created="Tue, 10 May 2022 21:34:03 +0000"  >&lt;p&gt;Moving this ticket to the Backlog and removing the &quot;Backlog&quot; fixVersion as per our latest policy for using fixVersions. &lt;/p&gt;</comment>
                            <comment id="2352476" author="william.schultz" created="Wed, 31 Jul 2019 15:22:12 +0000"  >&lt;p&gt;See linked BF for another example of a large collStats object being printed when a mismatch is found.&lt;/p&gt;</comment>
                            <comment id="2352459" author="milkie" created="Wed, 31 Jul 2019 15:18:22 +0000"  >&lt;p&gt;Yes, just those fields would be even better, as long as you think those will continue to be the only fields that matter in the comparison.&lt;/p&gt;</comment>
                            <comment id="2352443" author="max.hirschhorn@10gen.com" created="Wed, 31 Jul 2019 15:11:23 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=milkie&quot; class=&quot;user-hover&quot; rel=&quot;milkie&quot;&gt;milkie&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=william.schultz&quot; class=&quot;user-hover&quot; rel=&quot;william.schultz&quot;&gt;william.schultz&lt;/a&gt;, is displaying all of the collStats output in the &lt;tt&gt;dumpCollectionDiff()&lt;/tt&gt; function actually helpful? I&apos;m wonder if we would rather just pluck the &lt;tt&gt;capped&lt;/tt&gt;, &lt;tt&gt;nindexes&lt;/tt&gt;, and &lt;tt&gt;ns&lt;/tt&gt; fields that are actually being compared.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/4958cedd5023aae532f36ad451644304106fc84d/src/mongo/shell/replsettest.js#L2040-L2067&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/4958cedd5023aae532f36ad451644304106fc84d/src/mongo/shell/replsettest.js#L2040-L2067&lt;/a&gt;&lt;/p&gt;</comment>
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