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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-20040] Holders of a ForwardingCatalogManager::ScopedDistLock should not call other methods on ForwardingCatalogManager</title>
                <link>https://jira.mongodb.org/browse/SERVER-20040</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Rather than call methods on ForwardingCatalogManager, holders of ForwardingCatalogManager::ScopedDistributedLock that need access to a catalog manager should get a pointer to the correct actual catalog manager by calling a method on their instance of ScopedDistributedLock.&lt;/p&gt;

&lt;p&gt;Because the FCM::SCD suppresses switching of the actual catalog manager underneath the ForwardingCatalogManager, it is unnecessary to engage FCM&apos;s locking and replacement detection. Furthermore, because the FCM::SCD is in scope, another operation on the FCM by the thread holding the FCM::SCD might block indefinitely waiting for the catalog manager to be replaced.&lt;/p&gt;

&lt;p&gt;This approach will cause operations that hold a ScopedDistributedLock, such as chunk migrations, to fail if the catalog manager needs to be replaced due to upgrade mid migration.&lt;/p&gt;</description>
                <environment></environment>
        <key id="226309">SERVER-20040</key>
            <summary>Holders of a ForwardingCatalogManager::ScopedDistLock should not call other methods on ForwardingCatalogManager</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="spencer@mongodb.com">Spencer Brody</assignee>
                                    <reporter username="schwerin@mongodb.com">Andy Schwerin</reporter>
                        <labels>
                    </labels>
                <created>Wed, 19 Aug 2015 19:24:14 +0000</created>
                <updated>Wed, 25 Jan 2017 22:00:16 +0000</updated>
                            <resolved>Wed, 2 Sep 2015 16:54:04 +0000</resolved>
                                                    <fixVersion>3.1.8</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1020758" author="xgen-internal-githook" created="Wed, 2 Sep 2015 16:21:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;stbrody&apos;, u&apos;name&apos;: u&apos;Spencer T Brody&apos;, u&apos;email&apos;: u&apos;spencer@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20040&quot; title=&quot;Holders of a ForwardingCatalogManager::ScopedDistLock should not call other methods on ForwardingCatalogManager&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20040&quot;&gt;&lt;del&gt;SERVER-20040&lt;/del&gt;&lt;/a&gt; fassert that we never hold a distributed lock while waiting for the CatalogManager to swap&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f5aa3dabe8e7a9cbc35a2af2286b4165a00cd17a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f5aa3dabe8e7a9cbc35a2af2286b4165a00cd17a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1020757" author="xgen-internal-githook" created="Wed, 2 Sep 2015 16:21:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;stbrody&apos;, u&apos;name&apos;: u&apos;Spencer T Brody&apos;, u&apos;email&apos;: u&apos;spencer@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20040&quot; title=&quot;Holders of a ForwardingCatalogManager::ScopedDistLock should not call other methods on ForwardingCatalogManager&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20040&quot;&gt;&lt;del&gt;SERVER-20040&lt;/del&gt;&lt;/a&gt; Don&apos;t call methods on ForwardingCatalogManager while holding a distlock&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a4437cd57009e209b1944613a163511574ad6343&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a4437cd57009e209b1944613a163511574ad6343&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1020756" author="xgen-internal-githook" created="Wed, 2 Sep 2015 16:21:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;stbrody&apos;, u&apos;name&apos;: u&apos;Spencer T Brody&apos;, u&apos;email&apos;: u&apos;spencer@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20040&quot; title=&quot;Holders of a ForwardingCatalogManager::ScopedDistLock should not call other methods on ForwardingCatalogManager&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20040&quot;&gt;&lt;del&gt;SERVER-20040&lt;/del&gt;&lt;/a&gt; Access the ForwardingCatalogManager explicitly when needed, otherwise use the CatalogManager interface&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0b658fdc266a13a042a31ab2a46182dac838459a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0b658fdc266a13a042a31ab2a46182dac838459a&lt;/a&gt;&lt;/p&gt;</comment>
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