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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-12445] Downgrading from 2.5.6 to 2.2.6 (through 2.4.9) fails </title>
                <link>https://jira.mongodb.org/browse/SERVER-12445</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I provisioned a MongoDB 2.2.6 cluster with the following configuration :&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;2 shards with 3 nodes each&lt;/li&gt;
	&lt;li&gt;1 config server&lt;/li&gt;
	&lt;li&gt;1 mongos&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;I sharded some collections but didn&apos;t add any users or text/geospatial indexes.&lt;/p&gt;

&lt;p&gt;I followed the upgrade instructions list &lt;a href=&quot;http://docs.mongodb.org/manual/release-notes/2.4-upgrade/#upgrade-mongodb-to-2-4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;2.2 to 2.4&lt;/a&gt; and &lt;a href=&quot;http://docs.mongodb.org/master/release-notes/2.6-upgrade/#upgrade-mongodb-to-2-5-x&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;2.4 to 2.6&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;When running through the downgrade process, I reversed the steps, that is :&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;start a &lt;tt&gt;2.4.9&lt;/tt&gt; mongos with &lt;tt&gt;--upgrade&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;restarted the original mongos at &lt;tt&gt;2.4.9&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;restarted a downgraded config server&lt;/li&gt;
	&lt;li&gt;did a rolling downgrade on the 3 nodes in the 2 shards&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The &lt;tt&gt;2.5.4&lt;/tt&gt; to &lt;tt&gt;2.4.9&lt;/tt&gt; worked.&lt;/p&gt;

&lt;p&gt;When I went to downgrade from &lt;tt&gt;2.4.9&lt;/tt&gt; to &lt;tt&gt;2.2.6&lt;/tt&gt;, the steps failed at the &lt;tt&gt;mongos --upgrade&lt;/tt&gt; step with the following error :&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;Wed Jan 22 21:49:04 warning: running with 1 config server should be done only for testing purposes and is not recommended for production&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;Wed Jan 22 21:49:04 [mongosMain] MongoS version 2.2.6 starting: pid=46242 port=47017 64-bit host=jimoleary.local (--help for usage)&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;Wed Jan 22 21:49:04 [mongosMain] git version: d626379119a6de9f2fb390780cf2fc336dfd540d&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;Wed Jan 22 21:49:04 [mongosMain] build info: Darwin bs-osx-106-x86-64-2.10gen.cc 10.8.0 Darwin Kernel Version 10.8.0: Tue Jun  7 16:32:41 PDT 2011; root:xnu-1504.15.3~1/RELEASE_X86_64 x86_64 BOOST_LIB_VERSION=1_49&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;Wed Jan 22 21:49:04 [mongosMain] options: { configdb: &quot;jimoleary.local:27024&quot;, logpath: &quot;/Users/joleary/Documents/Support/2014-01-22/CS-10348/data/mongos2.4.9.log&quot;, port: 47017, upgrade: true }&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;Wed Jan 22 21:49:04 [mongosMain] don&apos;t know how to upgrade 4 to 3&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;Wed Jan 22 21:49:04 [mongosMain] config server error: -8&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;Have I missed a step, the documentation is pretty sparse on this process.&lt;/p&gt;

&lt;p&gt;I retried the steps again with &lt;tt&gt;2.4.8&lt;/tt&gt; to see if that made any difference, unfortunately I got the same result.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
-Jim&lt;/p&gt;</description>
                <environment></environment>
        <key id="107216">SERVER-12445</key>
            <summary>Downgrading from 2.5.6 to 2.2.6 (through 2.4.9) fails </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="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="jim.oleary@mongodb.com">James O&apos;Leary</reporter>
                        <labels>
                    </labels>
                <created>Wed, 22 Jan 2014 22:19:47 +0000</created>
                <updated>Wed, 10 Dec 2014 23:15:06 +0000</updated>
                            <resolved>Fri, 24 Jan 2014 16:42:55 +0000</resolved>
                                    <version>2.5.4</version>
                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="487328" author="eliot" created="Fri, 24 Jan 2014 16:42:55 +0000"  >&lt;p&gt;This isn&apos;t supported.&lt;/p&gt;</comment>
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