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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-22156] dbhash does not invalidate cache for collection or DB level operations</title>
                <link>https://jira.mongodb.org/browse/SERVER-22156</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The dbhash cache stores an entry for each namespace. &lt;/p&gt;

&lt;p&gt;Collection or DB level operations pass in the namespace &quot;&lt;span class=&quot;error&quot;&gt;&amp;#91;DB_NAME&amp;#93;&lt;/span&gt;.$cmd&quot;. So only the entry for &lt;span class=&quot;error&quot;&gt;&amp;#91;DB_NAME&amp;#93;&lt;/span&gt;.$cmd is invalidated when one of these operations is called. &lt;/p&gt;

&lt;p&gt;When we run dbhash on a collection that has been dropped and recreated (e.g. &lt;span class=&quot;error&quot;&gt;&amp;#91;DB_NAME&amp;#93;&lt;/span&gt;.abcd), the old and incorrect value of the dbhash is used.&lt;/p&gt;</description>
                <environment></environment>
        <key id="246808">SERVER-22156</key>
            <summary>dbhash does not invalidate cache for collection or DB level operations</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="9">Done</resolution>
                                        <assignee username="robert.guo@mongodb.com">Robert Guo</assignee>
                                    <reporter username="robert.guo@mongodb.com">Robert Guo</reporter>
                        <labels>
                    </labels>
                <created>Tue, 12 Jan 2016 20:15:52 +0000</created>
                <updated>Fri, 5 Feb 2016 14:29:04 +0000</updated>
                            <resolved>Wed, 27 Jan 2016 16:16:25 +0000</resolved>
                                    <version>3.3.0</version>
                                    <fixVersion>3.3.1</fixVersion>
                                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1155355" author="xgen-internal-githook" created="Wed, 27 Jan 2016 16:07:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;guoyr&apos;, u&apos;name&apos;: u&apos;Robert Guo&apos;, u&apos;email&apos;: u&apos;robert.guo@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22156&quot; title=&quot;dbhash does not invalidate cache for collection or DB level operations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22156&quot;&gt;&lt;del&gt;SERVER-22156&lt;/del&gt;&lt;/a&gt; dbhash should cache hashes at the collection level&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c9fd26cd87a30b9db88dac42a1d2c480fc8bc308&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c9fd26cd87a30b9db88dac42a1d2c480fc8bc308&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1154611" author="robert.guo" created="Tue, 26 Jan 2016 23:05:37 +0000"  >&lt;p&gt;I unchecked the backport request as the performance impact of this change is not clear. dbhash will be blacklisted in the fuzzer on 3.2 to prevent build failures.&lt;/p&gt;</comment>
                            <comment id="1133008" author="robert.guo" created="Tue, 12 Jan 2016 22:27:40 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=max.hirschhorn&quot; class=&quot;user-hover&quot; rel=&quot;max.hirschhorn&quot;&gt;max.hirschhorn&lt;/a&gt; found out that the problem is that logOp passes the ns as &quot;config.$cmd&quot; for certain actions like dropDatabase or createCollection. This does not invalidate any namespaces that correspond to a real collection. &lt;/p&gt;

&lt;p&gt;I will repurpose this ticket to fix the caching logic instead.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
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                    <name>Depends</name>
                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="158549">SERVER-15277</issuekey>
        </issuelink>
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                            <issuelinktype id="10012">
                    <name>Related</name>
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                                        <issuelink>
            <issuekey id="261036">SERVER-22317</issuekey>
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