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    <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-45525] ReplBatcher should explicitly read at kNoTimestamp</title>
                <link>https://jira.mongodb.org/browse/SERVER-45525</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The ReplBatcher thread reads from the storage engine &lt;a href=&quot;https://github.com/mongodb/mongo/blob/02068498362c414b14ba6dcf10a87b3a7ddc32d3/src/mongo/db/repl/oplog_batcher.cpp#L285&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. This results in using &lt;a href=&quot;https://github.com/mongodb/mongo/blob/02068498362c414b14ba6dcf10a87b3a7ddc32d3/src/mongo/db/repl/storage_interface_impl.cpp#L430&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;AutoGetCollectionForReadCommand&lt;/a&gt;. The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/02068498362c414b14ba6dcf10a87b3a7ddc32d3/src/mongo/db/db_raii.cpp#L244&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;various rules&lt;/a&gt; of that helper allow the thread to read at kLastApplied.&lt;/p&gt;

&lt;p&gt;This behavior can cause rollback to crash in debug builds. Specifically while &lt;a href=&quot;https://github.com/mongodb/mongo/blob/87f20a3aa53d88846a34d299e9b0e7b39531a6e7/src/mongo/db/repl/rollback_impl.cpp#L543&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;reconstructing prepared transactions&lt;/a&gt;. &lt;a href=&quot;https://github.com/mongodb/mongo/blob/87f20a3aa53d88846a34d299e9b0e7b39531a6e7/src/third_party/wiredtiger/src/txn/txn_timestamp.c#L831&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;This WT assertion fails&lt;/a&gt; when the prepare timestamp is older than any active readers. The ReplBatcher, however, may still be reading at kLastApplied.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1088473">SERVER-45525</key>
            <summary>ReplBatcher should explicitly read at kNoTimestamp</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="matthew.russotto@mongodb.com">Matthew Russotto</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Mon, 13 Jan 2020 20:53:14 +0000</created>
                <updated>Sun, 29 Oct 2023 22:13:22 +0000</updated>
                            <resolved>Fri, 31 Jan 2020 17:03:08 +0000</resolved>
                                    <version>4.2.2</version>
                                    <fixVersion>4.2.6</fixVersion>
                    <fixVersion>4.3.4</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="3034158" author="xgen-internal-githook" created="Thu, 9 Apr 2020 21:20:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Russotto&apos;, &apos;email&apos;: &apos;matthew.russotto@10gen.com&apos;, &apos;username&apos;: &apos;mtrussotto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45525&quot; title=&quot;ReplBatcher should explicitly read at kNoTimestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45525&quot;&gt;&lt;del&gt;SERVER-45525&lt;/del&gt;&lt;/a&gt; ReplBatcher should explicitly read at kNoTimestamp&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d9b632531edcdd5d973dd0bba2848571c3351763&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d9b632531edcdd5d973dd0bba2848571c3351763&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2773627" author="xgen-internal-githook" created="Thu, 30 Jan 2020 19:38:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;mtrussotto&apos;, &apos;name&apos;: &apos;Matthew Russotto&apos;, &apos;email&apos;: &apos;matthew.russotto@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45525&quot; title=&quot;ReplBatcher should explicitly read at kNoTimestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45525&quot;&gt;&lt;del&gt;SERVER-45525&lt;/del&gt;&lt;/a&gt; ReplBatcher should explicitly read at kNoTimestamp&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ab01304d9c3e2b635f43a88920eef629be26c56e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ab01304d9c3e2b635f43a88920eef629be26c56e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2769197" author="matthew.russotto" created="Tue, 28 Jan 2020 20:48:44 +0000"  >&lt;p&gt;We had an idea to add an AutoGetOplogForRead helper, but I don&apos;t think we scheduled it.&lt;/p&gt;</comment>
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            <issuekey id="1031386">SERVER-44906</issuekey>
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