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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-18651] Cluster upgrade from 2.6.9 to 3.0.3 error: no such cmd: _getUserCacheGeneration</title>
                <link>https://jira.mongodb.org/browse/SERVER-18651</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have followed upgrade procedure for sharded cluster from 2.6 to 3.0. After successful upgrading of cluster&apos;s meta data, we have upgraded one of our mongos processes and started frequently (few per minute) seeing the following errors:&lt;/p&gt;

&lt;p&gt;2015-05-26T10:50:44.622+0200 I NETWORK  &lt;span class=&quot;error&quot;&gt;&amp;#91;UserCacheInvalidator&amp;#93;&lt;/span&gt; scoped connection to mongo1:27019,mongo2:27019,mongo3:27019 not being returned to the pool&lt;br/&gt;
2015-05-26T10:50:44.622+0200 W ACCESS   &lt;span class=&quot;error&quot;&gt;&amp;#91;UserCacheInvalidator&amp;#93;&lt;/span&gt; An error occurred while fetching current user cache generation to check if user cache needs invalidation: Location13053 help failed: { ok: 0.0, errmsg: &quot;no such cmd: _getUserCacheGeneration&quot;, code: 59, bad cmd: &lt;/p&gt;
{ _getUserCacheGeneration: &quot;1&quot;, help: 1 }
&lt;p&gt; }&lt;/p&gt;

&lt;p&gt;Are those erros something we should worry about? Can we proceed with the upgrade?&lt;/p&gt;</description>
                <environment></environment>
        <key id="206388">SERVER-18651</key>
            <summary>Cluster upgrade from 2.6.9 to 3.0.3 error: no such cmd: _getUserCacheGeneration</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="marcin.lipiec@nokaut.pl">Marcin Lipiec</reporter>
                        <labels>
                    </labels>
                <created>Tue, 26 May 2015 08:56:57 +0000</created>
                <updated>Tue, 18 Aug 2015 20:49:50 +0000</updated>
                            <resolved>Tue, 26 May 2015 17:03:50 +0000</resolved>
                                    <version>3.0.3</version>
                                                    <component>Admin</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="923595" author="kaloian.manassiev" created="Tue, 26 May 2015 17:03:35 +0000"  >&lt;p&gt;This is correct. The error message is just transient until the config servers are upgraded.&lt;/p&gt;

&lt;p&gt;Please refer to the &lt;a href=&quot;http://docs.mongodb.org/manual/release-notes/3.0-upgrade/#upgrade-a-sharded-cluster-to-3-0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MongoDB upgrade guide&lt;/a&gt; for the steps.&lt;/p&gt;</comment>
                            <comment id="923576" author="marcin.lipiec@nokaut.pl" created="Tue, 26 May 2015 16:51:44 +0000"  >&lt;p&gt;Actually we&apos;ve just upgraded only our mongos processes. As it seems we should continue upgrading our config servers, slaves and primaries from 2.6.9 to 3.0.3.&lt;/p&gt;</comment>
                            <comment id="923308" author="kaloian.manassiev" created="Tue, 26 May 2015 14:22:54 +0000"  >&lt;p&gt;Hi Marcin,&lt;/p&gt;

&lt;p&gt;This error means that on of your config servers does not support the _getUserCacheGeneration command. This command was added in 2.6.10 and you say you are upgrading from 2.6.9. My suspicion is that one of your config servers is not actually upgraded and is still at 2.6.9.&lt;/p&gt;

&lt;p&gt;Would you mind attaching the error logs from each individual config server (at least the startup lines so I can see the version).&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
-Kal.&lt;/p&gt;
</comment>
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                            <attachment id="75595" name="mongos_startup_log" size="108436" author="marcin.lipiec@nokaut.pl" created="Tue, 26 May 2015 08:56:57 +0000"/>
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