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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-25569] Iterating through ViewCatalog must be done under the mutex</title>
                <link>https://jira.mongodb.org/browse/SERVER-25569</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After &lt;a href=&quot;https://github.com/mongodb/mongo/commit/3f68c01861b33b76965d39ba5bcbd84e2851afe3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this commit&lt;/a&gt;, it is no longer permissible to expose the ViewMap&apos;s begin() and end() iterators to external users. Because no mutex is held, the catalog&apos;s map may change at any time, invalidating the iterators. Instead, we should create an iterate() method that accepts a callback, and iterate through the ViewMap under the protection of the catalog&apos;s mutex.&lt;/p&gt;

&lt;p&gt;In addition, we should call reloadIfNeeded() before beginning the iteration to sync with any changes to system.views.&lt;/p&gt;

&lt;h5&gt;&lt;a name=&quot;OriginalDescription&quot;&gt;&lt;/a&gt;Original Description&lt;/h5&gt;
&lt;p&gt;&lt;tt&gt;listCollections&lt;/tt&gt; does not refresh the ViewCatalog before iterating through it, meaning that it won&apos;t be updated even if a change to &lt;tt&gt;system.views&lt;/tt&gt; would have marked it as invalid.&lt;/p&gt;</description>
                <environment></environment>
        <key id="308378">SERVER-25569</key>
            <summary>Iterating through ViewCatalog must be done under the mutex</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="kyle.suarez@mongodb.com">Kyle Suarez</assignee>
                                    <reporter username="kyle.suarez@mongodb.com">Kyle Suarez</reporter>
                        <labels>
                            <label>read-only-views</label>
                    </labels>
                <created>Thu, 11 Aug 2016 18:42:25 +0000</created>
                <updated>Tue, 11 Oct 2016 22:04:56 +0000</updated>
                            <resolved>Fri, 19 Aug 2016 18:42:17 +0000</resolved>
                                    <version>3.3.10</version>
                                    <fixVersion>3.3.12</fixVersion>
                                    <component>Internal Code</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1362430" author="xgen-internal-githook" created="Fri, 19 Aug 2016 18:40:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;ksuarz&apos;, u&apos;name&apos;: u&apos;Kyle Suarez&apos;, u&apos;email&apos;: u&apos;kyle.suarez@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25569&quot; title=&quot;Iterating through ViewCatalog must be done under the mutex&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25569&quot;&gt;&lt;del&gt;SERVER-25569&lt;/del&gt;&lt;/a&gt; Must hold mutex when iterating through ViewCatalog&lt;/p&gt;

&lt;p&gt;Replaces ViewCatalog::begin()/::end() with a thread-safe iterate() method.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/be6868e2fd72522faa4250145e85aec1e0da6d0c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/be6868e2fd72522faa4250145e85aec1e0da6d0c&lt;/a&gt;&lt;/p&gt;</comment>
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