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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-48499] Biggie record store hides uncommitted oplog entries from wuow that added them</title>
                <link>https://jira.mongodb.org/browse/SERVER-48499</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="1366827">SERVER-48499</key>
            <summary>Biggie record store hides uncommitted oplog entries from wuow that added them</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="henrik.edin@mongodb.com">Henrik Edin</assignee>
                                    <reporter username="henrik.edin@mongodb.com">Henrik Edin</reporter>
                        <labels>
                    </labels>
                <created>Fri, 29 May 2020 17:29:01 +0000</created>
                <updated>Sun, 29 Oct 2023 22:07:37 +0000</updated>
                            <resolved>Fri, 5 Jun 2020 18:35:55 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3192976" author="xgen-internal-githook" created="Fri, 5 Jun 2020 18:27:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Henrik Edin&apos;, &apos;email&apos;: &apos;henrik.edin@mongodb.com&apos;, &apos;username&apos;: &apos;henrikedin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48499&quot; title=&quot;Biggie record store hides uncommitted oplog entries from wuow that added them&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48499&quot;&gt;&lt;del&gt;SERVER-48499&lt;/del&gt;&lt;/a&gt; Biggie cursor cleanup, store reference to record store instead of copying several of its members&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b8f0f575c5f75975291f742abca0b9eb182d1075&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b8f0f575c5f75975291f742abca0b9eb182d1075&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3192975" author="xgen-internal-githook" created="Fri, 5 Jun 2020 18:27:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Henrik Edin&apos;, &apos;email&apos;: &apos;henrik.edin@mongodb.com&apos;, &apos;username&apos;: &apos;henrikedin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48499&quot; title=&quot;Biggie record store hides uncommitted oplog entries from wuow that added them&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48499&quot;&gt;&lt;del&gt;SERVER-48499&lt;/del&gt;&lt;/a&gt; Biggie reverse cursors should not hide oplog entries&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/50a77a9d5ce58047bf521c9fb7db65cfc4c1f356&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/50a77a9d5ce58047bf521c9fb7db65cfc4c1f356&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3148488" author="daniel.gottlieb@10gen.com" created="Mon, 1 Jun 2020 14:03:59 +0000"  >&lt;p&gt;Ahh, this doesn&apos;t use a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e476c8ff9c/src/mongo/db/repl/oplog_interface_local.cpp#L67&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;forward scanning cursor&lt;/a&gt; so &quot;oplog visibility&quot; rules don&apos;t apply. I suspect a forward scanning cursor in WT couldn&apos;t see the entries. That&apos;s &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d7e1821e22d21cc20cd3f6930811f3915193a45d/src/mongo/db/storage/wiredtiger/wiredtiger_recovery_unit.cpp#L302&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;implemented&lt;/a&gt; at a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/82fd62e031f46a2c0e919f512df70c4de0b0d151/src/mongo/db/storage/wiredtiger/wiredtiger_record_store.cpp#L2147&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;different layer&lt;/a&gt; (for reasons).&lt;/p&gt;</comment>
                            <comment id="3148365" author="henrik.edin" created="Mon, 1 Jun 2020 12:05:13 +0000"  >&lt;p&gt;I discovered it when enabling unittests to run with this storage engine. We are in a multi-document transaction so I think it would work fine with WT.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/82fd62e031f46a2c0e919f512df70c4de0b0d151/src/mongo/db/op_observer_impl_test.cpp#L2282&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/82fd62e031f46a2c0e919f512df70c4de0b0d151/src/mongo/db/op_observer_impl_test.cpp#L2282&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3147766" author="daniel.gottlieb@10gen.com" created="Sat, 30 May 2020 18:09:55 +0000"  >&lt;p&gt;Is there an associated test failure with this? I&apos;m curious if you observed a symptom that was caused by this.&lt;/p&gt;

&lt;p&gt;I agree reading ones own writes is important, but I&apos;m unsure if our WT implementation does this outside some specific circumstances. I would expect something that tries writing to the oplog and then reading from the oplog in the same transaction would &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d00b75bfcac3ac74036ac6c2ceec4e8b42ac93a0/src/mongo/db/storage/wiredtiger/wiredtiger_record_store.cpp#L2323-L2325&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;fail this invariant&lt;/a&gt;.&lt;/p&gt;</comment>
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