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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-81487] Add comments that acquireCollection() and AutoGet() can throw WriteConflictExceptions</title>
                <link>https://jira.mongodb.org/browse/SERVER-81487</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71287&quot; title=&quot;Use collection in sync with snapshot instead of throwing SnapshotUnavailable in untimestamped multi-document transaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71287&quot;&gt;&lt;del&gt;SERVER-71287&lt;/del&gt;&lt;/a&gt; changed the behavior of &lt;a href=&quot;https://github.com/10gen/mongo/blob/be38579dc72a40988cada1f43ab6695dcff8cc36/src/mongo/db/catalog_raii.cpp#L71&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;verifyDbAndCollection()&lt;/a&gt; to throw a WriteConflictException rather than SnapshotUnavailable when there is a write request.&lt;/p&gt;

&lt;p&gt;This means &lt;a href=&quot;https://github.com/10gen/mongo/blob/be38579dc72a40988cada1f43ab6695dcff8cc36/src/mongo/db/shard_role.cpp#L767&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;acquireCollection()&lt;/a&gt; and &lt;a href=&quot;https://github.com/10gen/mongo/blob/be38579dc72a40988cada1f43ab6695dcff8cc36/src/mongo/db/catalog_raii.cpp#L274&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;AutoGetCollection()&lt;/a&gt; can both throw WriteConflictException when establishing a collection snapshot.&#160;&lt;/p&gt;

&lt;p&gt;There are&#160;&lt;a href=&quot;https://github.com/10gen/mongo/blob/be38579dc72a40988cada1f43ab6695dcff8cc36/src/mongo/db/catalog/index_repair.cpp#L81&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;several places&lt;/a&gt;&#160;in the code that don&apos;t wrap&#160;&lt;tt&gt;acquireCollection()&lt;/tt&gt; in a writeConflictRetry(), but use writeConflictRetry() in the lines following the acquisition.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2452298">SERVER-81487</key>
            <summary>Add comments that acquireCollection() and AutoGet() can throw WriteConflictExceptions</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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-catalog-and-routing">Backlog - Catalog and Routing</assignee>
                                    <reporter username="haley.connelly@mongodb.com">Haley Connelly</reporter>
                        <labels>
                            <label>car-qw</label>
                    </labels>
                <created>Wed, 27 Sep 2023 09:03:08 +0000</created>
                <updated>Fri, 3 Nov 2023 06:46:18 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5736902" author="haley.connelly" created="Thu, 28 Sep 2023 09:48:55 +0000"  >&lt;p&gt;&lt;del&gt;We should probably update the code to internally handle WCE in the initial acquireCollection call as a part of the API.&lt;/del&gt;&lt;br/&gt;
Edit: It&apos;s not safe to retry at such a low level in case higher level operations need to be yielded to handle WCE&lt;br/&gt;
cc &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kaloian.manassiev%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;kaloian.manassiev@mongodb.com&quot;&gt;kaloian.manassiev@mongodb.com&lt;/a&gt; who brought this up offline.&lt;/p&gt;</comment>
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