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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-5257] When duplicate oids are found by the balancer, validate the replica set name</title>
                <link>https://jira.mongodb.org/browse/SERVER-5257</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, Balancer::_checkOIDs() produces this error message if duplicate oids are detected:&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;
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					&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;    log() &amp;lt;&amp;lt; &quot;error: 2 machines have &quot; &amp;lt;&amp;lt; x &amp;lt;&amp;lt; &quot; as oid machine piece &quot; &amp;lt;&amp;lt; s.toString() &amp;lt;&amp;lt; &quot; and &quot; &amp;lt;&amp;lt; oids[x].toString() &amp;lt;&amp;lt; endl;&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;This error message can occur if the config server&apos;s shards collection contains unique &apos;host&apos; strings, but with the same replica set name.  The following configuration error could cause this:&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;
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					&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;mongos&amp;gt; db.shards.find()&lt;/span&gt;&lt;/pre&gt;
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						&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;{ &quot;_id&quot; : &quot;sh1&quot;, &quot;host&quot; : &quot;rs1/localhost:27017,localhost:27018,localhost:27019&quot; }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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-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;{ &quot;_id&quot; : &quot;sh2&quot;, &quot;host&quot; : &quot;rs1/localhost:27027,localhost:27028,localhost:27029&quot; }&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;The intended configuration is to use &apos;rs2&apos; for the second line in this example.  Although quite rare, this is a very easy error to overlook because the hostnames and shard names are correct.  It might be nice to add logic to detect and print a more robust error message when multiple shards are pointing at the same replica set name.&lt;/p&gt;

&lt;p&gt;Note that this check could likely live in MoveChunkCommand and SplitChunkCommand.&lt;/p&gt;</description>
                <environment>All</environment>
        <key id="32547">SERVER-5257</key>
            <summary>When duplicate oids are found by the balancer, validate the replica set name</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="5" iconUrl="https://jira.mongodb.org/images/icons/priorities/trivial.svg">Trivial - P5</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="sergi.mateo-bellido@mongodb.com">Sergi Mateo Bellido</assignee>
                                    <reporter username="benjamin.becker">Ben Becker</reporter>
                        <labels>
                            <label>RachitaD</label>
                            <label>sharding-common-backlog</label>
                    </labels>
                <created>Thu, 8 Mar 2012 22:03:02 +0000</created>
                <updated>Tue, 7 Mar 2023 09:11:40 +0000</updated>
                            <resolved>Mon, 27 Feb 2023 14:37:25 +0000</resolved>
                                    <version>2.0.3</version>
                    <version>2.1.0</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="5069948" author="connie.chen" created="Wed, 21 Dec 2022 13:43:00 +0000"  >&lt;p&gt;Putting into investigation to see if this is still an issue we see, given how old this ticket is.&lt;/p&gt;</comment>
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