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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-54116] An AutoGetCollectionForReadLockFree instantiated under a AutoGetCollectionForRead with an already open storage snapshot invariants</title>
                <link>https://jira.mongodb.org/browse/SERVER-54116</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Lock-free reads must be able to handle AutoGetCollectionForReadLockFree being instantiated under an AutoGetCollectionForRead that has already opened a storage snapshot/transaction. OR, abandonSnapshot() must be called before or in AutoGetCollectionForReadLockFree somehow.&lt;/p&gt;

&lt;p&gt;Scenario where the bug surfaced:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/82fad519d9bd7374a85fc5dc973a4479e15eb13c/src/mongo/db/commands/dbcommands_d.cpp#L416-L426&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;dumpChunks uses a DBDirectClient for a query&lt;/a&gt;. There is an &lt;a href=&quot;https://github.com/mongodb/mongo/blob/82fad519d9bd7374a85fc5dc973a4479e15eb13c/src/mongo/db/commands/dbcommands_d.cpp#L306-L307&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;AutoGetCollectionForRead instantiated&lt;/a&gt; already instantiated. &lt;a href=&quot;https://github.com/mongodb/mongo/blob/82fad519d9bd7374a85fc5dc973a4479e15eb13c/src/mongo/db/commands/dbcommands_d.cpp#L341&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;A query was in-progress&lt;/a&gt; when the error occurred that resulted in the DBDirectClient use for better error reporting.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1603606">SERVER-54116</key>
            <summary>An AutoGetCollectionForReadLockFree instantiated under a AutoGetCollectionForRead with an already open storage snapshot invariants</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="13201">Fixed</resolution>
                                        <assignee username="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Thu, 28 Jan 2021 18:20:46 +0000</created>
                <updated>Sun, 29 Oct 2023 21:58:16 +0000</updated>
                            <resolved>Tue, 16 Feb 2021 22:37:42 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3618236" author="xgen-internal-githook" created="Tue, 16 Feb 2021 22:27:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dianna Hohensee&apos;, &apos;email&apos;: &apos;dianna.hohensee@mongodb.com&apos;, &apos;username&apos;: &apos;DiannaHohensee&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54116&quot; title=&quot;An AutoGetCollectionForReadLockFree instantiated under a AutoGetCollectionForRead with an already open storage snapshot invariants&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54116&quot;&gt;&lt;del&gt;SERVER-54116&lt;/del&gt;&lt;/a&gt; AutoGetCollection*MaybeLockFree should pivot to locked if a storage snapshot is already open without the lock-free read operation flag set.&lt;/p&gt;

&lt;p&gt;This avoids using a -LockFree helper, via the DBDirectClient, that must reset the storage snapshot.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5d0eaf8291050689b970581083abc5d0e6c931d1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5d0eaf8291050689b970581083abc5d0e6c931d1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3588140" author="dianna.hohensee" created="Thu, 28 Jan 2021 19:57:10 +0000"  >&lt;p&gt;A simple solution might be to pivot in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ecf49b00ca39fb7e6cd74dbbec749b1007eaf006/src/mongo/db/db_raii.cpp#L63-L64&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;supportsLockFreeRead()&lt;/a&gt; based on whether there are any collection locks held.&lt;/p&gt;

&lt;p&gt;Update: checking for a collection lock would be clean, but also costly, because the isCollectionLockedForMode function is not cheap. Therefore, shouldn&apos;t use that on all LFR reads.&lt;/p&gt;</comment>
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