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    <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-27033] Optype &quot;db&quot; not handled correctly by applyOperation_inlock</title>
                <link>https://jira.mongodb.org/browse/SERVER-27033</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;{&lt;tt&gt;op: &quot;db&quot;&lt;/tt&gt;} oplog entries are used to declare the presence of a database. However, applyOperation_inlock() begins to parse them as delete oplog entries, and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.4.0-rc3/src/mongo/db/repl/oplog.cpp#L949&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;fails because they do not have an &lt;tt&gt;_id&lt;/tt&gt; field&lt;/a&gt;. &lt;/p&gt;

&lt;p&gt;{&lt;tt&gt;op: &quot;db&quot;&lt;/tt&gt;} oplog entries are used in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.4.0-rc3/src/mongo/db/repl/master_slave.cpp#L943&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;master-slave replication&lt;/a&gt;. This leads to log lines like:&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;sync: caught user assertion 4 Failed to apply delete due to missing _id: { ns: &quot;test.&quot;, op: &quot;db&quot; } while applying op: { ns: &quot;test.&quot;, op: &quot;db&quot; }&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="331822">SERVER-27033</key>
            <summary>Optype &quot;db&quot; not handled correctly by applyOperation_inlock</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="9">Done</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
                    </labels>
                <created>Mon, 14 Nov 2016 23:30:49 +0000</created>
                <updated>Tue, 6 Dec 2022 04:11:46 +0000</updated>
                            <resolved>Wed, 4 Sep 2019 19:57:41 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1439054" author="spencer" created="Mon, 21 Nov 2016 15:34:10 +0000"  >&lt;p&gt;We weren&apos;t able to successfully reproduce, but so far we&apos;ve only ever seen this happen once in one of our tests that was relying on incorrect assumptions about how master-slave initial sync works.  We&apos;ve had no reports of this in from the wild, there&apos;s no evidence that it actually causes a problem, and as far as we can tell it&apos;s most likely existed as long as master-slave replication has.  Throwing this into &quot;planned but not scheduled&quot; for now, if we hear of anyone actually encountering this we can consider pulling forward at that time.&lt;/p&gt;</comment>
                            <comment id="1434663" author="spencer" created="Tue, 15 Nov 2016 17:10:15 +0000"  >&lt;p&gt;Tess is going to try to make a repro so we can determine if this is a regression or a beginning-of-time bug.&lt;/p&gt;</comment>
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            <issuekey id="332130">SERVER-27054</issuekey>
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