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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-31649] CachedCollectionProperties::getCollectionProperties accesses the collection with only DB IS lock</title>
                <link>https://jira.mongodb.org/browse/SERVER-31649</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/6459867cc36f379d01f2f99642f6edcabdd3c1ce/src/mongo/db/repl/sync_tail.cpp#L612&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;This&lt;/a&gt; code in CachedCollectionProperties::getCollectionPropertiesImpl accesses the collection while only holding a database IS lock.&lt;/p&gt;

&lt;p&gt;While in practice this may work, because dropping a collection takes database X lock, technically the collection object is not stable without some form of collection lock, which in this case should be IS.&lt;/p&gt;</description>
                <environment></environment>
        <key id="448370">SERVER-31649</key>
            <summary>CachedCollectionProperties::getCollectionProperties accesses the collection with only DB IS lock</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="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-repl">Backlog - Replication Team</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Thu, 19 Oct 2017 20:34:51 +0000</created>
                <updated>Tue, 6 Dec 2022 03:48:52 +0000</updated>
                                            <version>3.4.9</version>
                    <version>3.6.0-rc0</version>
                                                    <component>Replication</component>
                                        <votes>1</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="3032352" author="siyuan.zhou@10gen.com" created="Thu, 9 Apr 2020 05:20:02 +0000"  >&lt;p&gt;This still seems a problem even if we don&apos;t need DB locks any more. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=geert.bosch&quot; class=&quot;user-hover&quot; rel=&quot;geert.bosch&quot;&gt;geert.bosch&lt;/a&gt;, I&apos;d like to double check that we still need the collection lock before &lt;a href=&quot;https://github.com/mongodb/mongo/blob/edb8778350326d2b33f056b1b5f0b25a4b5b444a/src/mongo/db/repl/oplog_applier_impl.cpp#L169&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;access the catalog&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="1758809" author="cramaechi" created="Sat, 23 Dec 2017 04:32:24 +0000"  >&lt;p&gt;Hi everyone,&lt;/p&gt;

&lt;p&gt;I am a new server contributor and would like to be assigned this ticket.&lt;/p&gt;

&lt;p&gt;My proposed change would be to add the statement&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;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;  margin-top: 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;Lock::CollectionLock collLock(opCtx-&amp;gt;lockState(), ns, MODE_IS); &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;right underneath the statement&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;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;  margin-top: 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;Lock::DBLock dbLock(opCtx, nsToDatabaseSubstring(ns), MODE_IS);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;in &lt;tt&gt;CachedCollectionProperties&lt;/tt&gt;::&lt;tt&gt;getCollectionPropertiesImpl&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;This new statement would then allow the collection to be accessed with a Collection IS lock; thus, making it stable.&lt;/p&gt;

&lt;p&gt;Please share your thoughts.&lt;/p&gt;

&lt;p&gt;Best Regards,&lt;br/&gt;
Chibuikem Amaechi&lt;/p&gt;</comment>
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