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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-8279] Warn or do not allow the balancer to balance when running in a mixed sharded cluster</title>
                <link>https://jira.mongodb.org/browse/SERVER-8279</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6902&quot; title=&quot;MongoDB 2.2 and MongoDB 2.0 cannot be mixed in sharded cluster&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6902&quot;&gt;&lt;del&gt;SERVER-6902&lt;/del&gt;&lt;/a&gt; means that running 2.2 and 2.0 in a sharded environment is a very bad thing.  Given this, it should be very apparent that this is happening - difficult to miss messages in the log would be a first step, potentially not allowing the balancer to operate would be the most intrusive step.&lt;/p&gt;</description>
                <environment></environment>
        <key id="62922">SERVER-8279</key>
            <summary>Warn or do not allow the balancer to balance when running in a mixed sharded cluster</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="greg_10gen">Greg Studer</assignee>
                                    <reporter username="andre.defrere@mongodb.com">Andre de Frere</reporter>
                        <labels>
                    </labels>
                <created>Tue, 22 Jan 2013 20:42:09 +0000</created>
                <updated>Thu, 7 Dec 2023 08:03:43 +0000</updated>
                            <resolved>Mon, 11 Feb 2013 22:42:12 +0000</resolved>
                                    <version>2.0.8</version>
                    <version>2.2.2</version>
                                    <fixVersion>2.4.0-rc1</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="260090" author="greg_10gen" created="Thu, 7 Feb 2013 16:00:55 +0000"  >&lt;p&gt;Think the new warning alongside the newer exclude functionality in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/jstests/multiVersion/config_version_excludes.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/jstests/multiVersion/config_version_excludes.js&lt;/a&gt; (not yet fully doc&apos;d) will give more visibility to the problem in the future.&lt;/p&gt;</comment>
                            <comment id="260028" author="auto" created="Thu, 7 Feb 2013 14:46:03 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-01-28T19:35:26Z&apos;, u&apos;email&apos;: u&apos;greg@10gen.com&apos;, u&apos;name&apos;: u&apos;Greg Studer&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8279&quot; title=&quot;Warn or do not allow the balancer to balance when running in a mixed sharded cluster&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8279&quot;&gt;&lt;del&gt;SERVER-8279&lt;/del&gt;&lt;/a&gt; warn if shard versions differ in mixed cluster&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6dec70a4f6d8b968fe69af32ce0efc2198c13eed&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6dec70a4f6d8b968fe69af32ce0efc2198c13eed&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="247731" author="greg_10gen" created="Wed, 23 Jan 2013 16:41:53 +0000"  >&lt;p&gt;Tried to reproduce this with v2.2.0 and v2.2.2 - no luck.  &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6002&quot; title=&quot;Query on same field with $gt/$gte and $lt/$lte ignores one end of the range&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6002&quot;&gt;&lt;del&gt;SERVER-6002&lt;/del&gt;&lt;/a&gt; was an issue running v2.0 and v2.2 mongoD processes together, not mongoS.  It was intended that v2.0 and v2.2 shards should be compatible, however a bug prevented this (which was fixed).  &lt;/p&gt;

&lt;p&gt;Think a mixed-cluster warning is a good idea in general, but not yet able to see a mixed mongoS issue.&lt;/p&gt;</comment>
                            <comment id="246916" author="hoffrocket" created="Tue, 22 Jan 2013 21:09:56 +0000"  >&lt;p&gt;Hi, I observed this problem at Foursquare.  Here are the details:&lt;/p&gt;

&lt;p&gt;We were running a cluster where the mongoS versions were mixed between 2.2 and 2.0 versions (the mixed versioning was accidental).  One of the 2.2 mongoS got the balancer lock and moved some chunks.  The 2.0 mongoS did not update their chunk configuration when the move was complete.  So all traffic continued to be directed to the old shards for those chunks. &lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10520">
                    <name>Problem/Incident</name>
                                            <outwardlinks description="causes">
                                        <issuelink>
            <issuekey id="2518669">SERVER-83956</issuekey>
        </issuelink>
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                            <issuelinktype id="10012">
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                                        <issuelink>
            <issuekey id="48663">SERVER-6902</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
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                            <attachment id="23411" name="mixed_mongos_v20_and_v22.js" size="2505" author="greg_10gen" created="Wed, 23 Jan 2013 16:42:09 +0000"/>
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