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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-32255] UUIDs may be absent from shard secondary local collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-32255</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When a secondary is added to a shard replset with FCV=3.6, it does not generate UUIDs on the local database.&lt;/p&gt;</description>
                <environment></environment>
        <key id="470615">SERVER-32255</key>
            <summary>UUIDs may be absent from shard secondary local collections</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="maria.vankeulen@mongodb.com">Maria van Keulen</assignee>
                                    <reporter username="kevin.albertson@mongodb.com">Kevin Albertson</reporter>
                        <labels>
                    </labels>
                <created>Mon, 11 Dec 2017 16:31:22 +0000</created>
                <updated>Mon, 30 Oct 2023 23:10:02 +0000</updated>
                            <resolved>Fri, 5 Jan 2018 02:57:47 +0000</resolved>
                                    <version>3.6.0</version>
                                    <fixVersion>3.6.2</fixVersion>
                    <fixVersion>3.7.1</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1766037" author="xgen-internal-githook" created="Fri, 5 Jan 2018 14:29:30 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Maria van Keulen&apos;, &apos;username&apos;: &apos;mvankeulen94&apos;, &apos;email&apos;: &apos;maria@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32255&quot; title=&quot;UUIDs may be absent from shard secondary local collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32255&quot;&gt;&lt;del&gt;SERVER-32255&lt;/del&gt;&lt;/a&gt; Ensure UUIDs exist for local collections on ShardServers&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 2158ea8d6c84c9a68b50f76c9dd23b8a193b65f8)&lt;/p&gt;

&lt;p&gt;Conflicts:&lt;br/&gt;
	buildscripts/resmokeconfig/suites/sharding_last_stable_mongos_and_mixed_shards.yml&lt;br/&gt;
	jstests/multiVersion/do_upgrade_downgrade.js&lt;br/&gt;
	src/mongo/db/commands/validate.cpp&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/489d177dbd0f0420a8ca04d39fd78d0a2c539420&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/489d177dbd0f0420a8ca04d39fd78d0a2c539420&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1765644" author="xgen-internal-githook" created="Thu, 4 Jan 2018 23:28:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Maria van Keulen&apos;, &apos;username&apos;: &apos;mvankeulen94&apos;, &apos;email&apos;: &apos;maria@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32255&quot; title=&quot;UUIDs may be absent from shard secondary local collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32255&quot;&gt;&lt;del&gt;SERVER-32255&lt;/del&gt;&lt;/a&gt; Ensure UUIDs exist for local collections on ShardServers&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2158ea8d6c84c9a68b50f76c9dd23b8a193b65f8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2158ea8d6c84c9a68b50f76c9dd23b8a193b65f8&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="453957">SERVER-31793</issuekey>
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                <attachments>
                            <attachment id="173012" name="added_secondary_no_uuid.js" size="1079" author="kevin.albertson@mongodb.com" created="Mon, 11 Dec 2017 16:30:10 +0000"/>
                            <attachment id="173013" name="added_secondary_no_uuid.log" size="455407" author="kevin.albertson@mongodb.com" created="Mon, 11 Dec 2017 16:29:45 +0000"/>
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                            <customfieldvalue>&lt;p&gt;A slightly more detailed repro script and logs are attached, but the gist of it is the following:&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;// init with one shard with one node rs&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;var st = new ShardingTest({shards: 1, rs: {nodes: 1}, mongos: 1});&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;var mongos = st.s;&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;var rs = st.rs0;&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;&amp;nbsp;&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;// add a node to shard rs&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;var newNode = rs.add({&apos;shardsvr&apos;: &apos;&apos;});&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;rs.reInitiate();&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;rs.awaitSecondaryNodes();&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;The new secondary has FCV=3.6, but local collections do not have UUIDs. Regular (non-local) collections do have the correct UUID however.&lt;/p&gt;

&lt;p&gt;Per suggestions, the fix may just be not to skip shard servers here: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.6.0/src/mongo/db/repl/initial_syncer.cpp#L1098-L1119&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.6.0/src/mongo/db/repl/initial_syncer.cpp#L1098-L1119&lt;/a&gt;&lt;/p&gt;</customfieldvalue>

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