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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-3935] mixing 1.8.3 and 2.0.0 in a replica set will cause 1.8.3 cannot use it&apos;s indexes</title>
                <link>https://jira.mongodb.org/browse/SERVER-3935</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;1. set up a new replica set on a 2.0.0 server&lt;br/&gt;
2. insert some data and create some indexes on them&lt;br/&gt;
3. add a 1.8.3 SECONDARY and a ARBITER and wait for the resync to complete&lt;br/&gt;
4. stop the PRIMARY, wait for the 1.8.3 SECONDARY to became PRIMARY&lt;br/&gt;
5. do some queries on the new 1.8.3 PRIMARY. the server cannot use the indexes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="22728">SERVER-3935</key>
            <summary>mixing 1.8.3 and 2.0.0 in a replica set will cause 1.8.3 cannot use it&apos;s indexes</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="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="lqs">Liu Qishuai</reporter>
                        <labels>
                            <label>indexing</label>
                    </labels>
                <created>Fri, 23 Sep 2011 11:34:16 +0000</created>
                <updated>Wed, 29 Feb 2012 03:53:39 +0000</updated>
                            <resolved>Sat, 24 Sep 2011 03:57:28 +0000</resolved>
                                    <version>1.8.3</version>
                                                    <component>Index Maintenance</component>
                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="56545" author="lqs" created="Mon, 26 Sep 2011 02:33:54 +0000"  >&lt;p&gt;The index is described as &lt;/p&gt;
{v: 1}
&lt;p&gt; in system.indexes, but actually the index data is stored in old version. There is no assertion about index version in mongod &amp;lt;= 1.8.2, so it can correctly use the index.&lt;/p&gt;</comment>
                            <comment id="56528" author="eliot" created="Sun, 25 Sep 2011 20:36:43 +0000"  >&lt;p&gt;1.8.2 will assert if a v1 index is used.&lt;br/&gt;
Not sure what you mean.&lt;/p&gt;</comment>
                            <comment id="56523" author="lqs" created="Sun, 25 Sep 2011 17:23:22 +0000"  >&lt;p&gt;I don&apos;t think it&apos;s expected. The 1.8.2 server can use the fake v1 index correctly, but 1.8.3 can&apos;t.&lt;/p&gt;</comment>
                            <comment id="56378" author="eliot" created="Sat, 24 Sep 2011 03:57:28 +0000"  >&lt;p&gt;This is expected.&lt;/p&gt;

&lt;p&gt;See upgrade section in release notes:&lt;br/&gt;
&lt;a href=&quot;http://www.mongodb.org/display/DOCS/2.0+Release+Notes&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/2.0+Release+Notes&lt;/a&gt;&lt;/p&gt;</comment>
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