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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-21762] Change dbHash output based on non-existence of db</title>
                <link>https://jira.mongodb.org/browse/SERVER-21762</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If the database doesn&apos;t exist the dbhash output should have a clear indication of that, possible like this:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;   md5: &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;false&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;, &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// for compat.&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;   missing: &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;true&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;, &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// indication it is missing and doesn&apos;t exist&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;...}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;Adding this additional information will allow the test framework to distinguish when a db exists or not on a replica, independent of storage engine impl. Right now we cannot detect some types of replication failures using dbhash.&lt;/p&gt;</description>
                <environment></environment>
        <key id="242180">SERVER-21762</key>
            <summary>Change dbHash output based on non-existence of db</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="9">Done</resolution>
                                        <assignee username="robert.guo@mongodb.com">Robert Guo</assignee>
                                    <reporter username="scotthernandez">Scott Hernandez</reporter>
                        <labels>
                    </labels>
                <created>Thu, 3 Dec 2015 22:12:28 +0000</created>
                <updated>Wed, 5 Apr 2017 16:43:43 +0000</updated>
                            <resolved>Tue, 12 Jul 2016 16:50:14 +0000</resolved>
                                                                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1321564" author="robert.guo" created="Tue, 12 Jul 2016 16:50:14 +0000"  >&lt;p&gt;closing as &quot;works as designed&quot;. The design is that db&apos;s are not guaranteed to exist on all replicaset nodes, so adding the &quot;exists&quot; field provides no additional value.&lt;/p&gt;</comment>
                            <comment id="1321561" author="robert.guo" created="Tue, 12 Jul 2016 16:48:22 +0000"  >&lt;p&gt;It is possible for some databases that only have a non-replicable collection (e.g. system.profile) to exist on a subset of nodes in a replicaset. So we can&apos;t guarantee that the database exists on all nodes under all circumstances.&lt;/p&gt;

&lt;p&gt;The only things that we can guarantee are &lt;br/&gt;
1. the database should not exist on any node immediately after doing a&lt;br/&gt;
dropDatabase()&lt;br/&gt;
2. the database should not exist on any node if no system.profile (or other&lt;br/&gt;
non-replicable collection) has ever been created on it.&lt;/p&gt;

&lt;p&gt;These guarantees requires tracking state, so it&apos;s tricky to include them in the output of the dbhash command.&lt;/p&gt;

&lt;p&gt;For replicable system collections, they have been added to dbhash as part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22744&quot; title=&quot;CheckReplDBHash Should check user writable system collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22744&quot;&gt;&lt;del&gt;SERVER-22744&lt;/del&gt;&lt;/a&gt;. This is likely as close as we can get to asserting that system collections in databases are replicated correctly.&lt;/p&gt;</comment>
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