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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-8587] Reindex needed after upgrade through replication?</title>
                <link>https://jira.mongodb.org/browse/SERVER-8587</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After having completed an upgrade from 1.6 to 2.2 via launching new instances, adding them to the ReplicaSet and letting them update, and then removing the old instances, do I still need to reindex to get more performance? Or did the replication (versus upgrading the Mongo version on the same instance with the old data files) handle the newer and better index style already?&lt;/p&gt;

&lt;p&gt;If I do have to re-index, can it be done without downtime?&lt;/p&gt;</description>
                <environment>ReplicaSet upgraded from 1.6</environment>
        <key id="65379">SERVER-8587</key>
            <summary>Reindex needed after upgrade through replication?</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="jon@animoto.com">Jon Eisenstein</reporter>
                        <labels>
                    </labels>
                <created>Fri, 15 Feb 2013 05:26:46 +0000</created>
                <updated>Fri, 15 Feb 2013 15:06:20 +0000</updated>
                            <resolved>Fri, 15 Feb 2013 14:14:16 +0000</resolved>
                                    <version>2.2.2</version>
                                                    <component>Index Maintenance</component>
                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="267107" author="scotthernandez" created="Fri, 15 Feb 2013 14:14:16 +0000"  >&lt;p&gt;If the new replicas did an initial sync, and had no data to start with, then they have already been updated to the latest index version and there is no need for a reIndex or repair/rebuild.&lt;/p&gt;</comment>
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