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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-33018] Report lastCommittedOpTime in all command responses on mongod</title>
                <link>https://jira.mongodb.org/browse/SERVER-33018</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Summary:&lt;/p&gt;

&lt;p&gt;On commands from mongos, mongod should return its lastCommittedOpTime (i.e. the timestamp from the opTime of its last committed write).&lt;/p&gt;


&lt;p&gt;Design:&lt;/p&gt;

&lt;p&gt;Inside &lt;tt&gt;appendReplyMetadata&lt;/tt&gt; and &lt;tt&gt;appendReplyMetadataOnError&lt;/tt&gt; in &lt;tt&gt;src/mongo/db/service_entry_point_mongod.cpp&lt;/tt&gt;, check if the node&apos;s ShardingState is enabled (which means its in a sharded cluster) or that it is a config server, and get the lastCommittedOpTime from the replication coordinator and append it to the metadata BSONObjBuilder.&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;   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;if (ShardingState::get(opCtx)-&amp;gt;enabled() || serverGlobalParams.clusterRole == ClusterRole::ConfigServer) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;    auto lastCommittedOpTime =&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;        repl::ReplicationCoordinator::get(opCtx)-&amp;gt;getLastCommittedOpTime();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;    metadataBob-&amp;gt;append(kLastCommittedOpTimeFieldName, lastCommittedOpTime.getTimestamp());&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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-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;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Open Questions:&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Should config servers return their lastCommittedOpTime?
	&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
		&lt;li&gt;Decision: Yes they should&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;POC: &lt;a href=&quot;https://mongodbcr.appspot.com/188020001/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodbcr.appspot.com/188020001/&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="489744">SERVER-33018</key>
            <summary>Report lastCommittedOpTime in all command responses on mongod</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="jack.mulrow@mongodb.com">Jack Mulrow</assignee>
                                    <reporter username="misha.tyulenev@mongodb.com">Misha Tyulenev</reporter>
                        <labels>
                    </labels>
                <created>Tue, 30 Jan 2018 19:21:09 +0000</created>
                <updated>Sun, 29 Oct 2023 22:35:17 +0000</updated>
                            <resolved>Tue, 6 Mar 2018 17:34:15 +0000</resolved>
                                                    <fixVersion>3.7.3</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1824758" author="xgen-internal-githook" created="Tue, 6 Mar 2018 17:33:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;, &apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;username&apos;: &apos;jsmulrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33018&quot; title=&quot;Report lastCommittedOpTime in all command responses on mongod&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33018&quot;&gt;&lt;del&gt;SERVER-33018&lt;/del&gt;&lt;/a&gt; Return lastCommittedOpTime in all command responses from sharding enabled mongod&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/90d304a5e510c4cc486abb527bb9d0a8b78720ca&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/90d304a5e510c4cc486abb527bb9d0a8b78720ca&lt;/a&gt;&lt;/p&gt;</comment>
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