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    <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-21357] index warning on hidden secondary after first sync</title>
                <link>https://jira.mongodb.org/browse/SERVER-21357</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;We created a new mongo node.&lt;/li&gt;
	&lt;li&gt;We added it to an existing replica set as a hidden secondary.&lt;/li&gt;
	&lt;li&gt;It went through startup2 and eventually came up as a hidden secondary.&lt;/li&gt;
	&lt;li&gt;Clients connecting to it would receive the following warning.
&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;
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				&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;2015-11-06T17:41:46.790+0000 I STORAGE  [initandlisten] WARNING: the collection &apos;some_db.fs.chunks&apos; lacks a unique index on _id. This index is needed for replication to function properly&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;2015-11-06T17:41:46.790+0000 I STORAGE  [initandlisten]          To fix this, you need to create a unique index on _id. See http://dochub.mongodb.org/core/build-replica-set-indexes&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Looking at the code, it seemed like it was because the index descriptor object had been called even though its destructor had already run.&lt;/p&gt;

&lt;p&gt;Workaround:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;We restarted the mongod process on the hidden secondary and now new connections don&apos;t have that warning.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="238442">SERVER-21357</key>
            <summary>index warning on hidden secondary after first sync</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="4">Incomplete</resolution>
                                        <assignee username="wan.bachtiar@mongodb.com">Wan Bachtiar</assignee>
                                    <reporter username="feanil">Feanil Patel</reporter>
                        <labels>
                    </labels>
                <created>Mon, 9 Nov 2015 16:45:52 +0000</created>
                <updated>Wed, 9 Dec 2015 22:12:54 +0000</updated>
                            <resolved>Wed, 9 Dec 2015 22:11:59 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1110089" author="wan.bachtiar" created="Wed, 9 Dec 2015 22:11:59 +0000"  >&lt;p&gt;Hi Feanil, &lt;/p&gt;

&lt;p&gt;We haven&#8217;t heard back from you for some time, so I am going to mark this ticket as resolved. &lt;br/&gt;
If this is still an issue for you, feel free to re-open the ticket and provide additional information.&lt;/p&gt;

&lt;p&gt;Regards, &lt;/p&gt;

&lt;p&gt;Wan.&lt;/p&gt;</comment>
                            <comment id="1096738" author="wan.bachtiar" created="Tue, 24 Nov 2015 05:34:30 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=feanil&quot; class=&quot;user-hover&quot; rel=&quot;feanil&quot;&gt;feanil&lt;/a&gt; , Can you please send the logs for :&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;The secondary that is missing indexes. From the time it was started until it has become a secondary.&lt;/li&gt;
	&lt;li&gt;The primary. Around the same time as the secondary log file above.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Also, what MongoDB version running on the primary and the secondary ? &lt;/p&gt;

&lt;p&gt;Regards, &lt;br/&gt;
Wan. &lt;/p&gt;</comment>
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            <issuekey id="233323">SERVER-20796</issuekey>
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	&lt;li&gt;Create a new mongo node&lt;/li&gt;
	&lt;li&gt;Add it as a hidden secondary to an existing cluster&lt;/li&gt;
	&lt;li&gt;Let it catch up&lt;/li&gt;
	&lt;li&gt;Connect to it using a mongo client(I tried this with a 3.03 client and a 3.0.7 client)&lt;/li&gt;
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