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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-24125] Write test that converts existing replica set to a sharded cluster and back</title>
                <link>https://jira.mongodb.org/browse/SERVER-24125</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It is supported to upgrade an existing unsharded deployment to a sharded one without downtime and vice versa.  We should have a jstest that tests this to ensure we never accidentally break that process&lt;/p&gt;</description>
                <environment></environment>
        <key id="285920">SERVER-24125</key>
            <summary>Write test that converts existing replica set to a sharded cluster and back</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Tue, 10 May 2016 19:26:21 +0000</created>
                <updated>Wed, 25 Jan 2017 21:58:48 +0000</updated>
                            <resolved>Sat, 20 Aug 2016 09:27:40 +0000</resolved>
                                                    <fixVersion>3.3.12</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1362811" author="xgen-internal-githook" created="Sat, 20 Aug 2016 09:24:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;renctan&apos;, u&apos;name&apos;: u&apos;Randolph Tan&apos;, u&apos;email&apos;: u&apos;randolph@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-24125&quot; title=&quot;Write test that converts existing replica set to a sharded cluster and back&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-24125&quot;&gt;&lt;del&gt;SERVER-24125&lt;/del&gt;&lt;/a&gt; Write test that converts existing replica set to a sharded cluster and back&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0b1cb011c860aa8c68714d4370c30417009993ed&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0b1cb011c860aa8c68714d4370c30417009993ed&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1350226" author="spencer" created="Mon, 8 Aug 2016 15:42:11 +0000"  >&lt;p&gt;Proposed test structure:&lt;br/&gt;
Set up a regular replica set, insert some data into at least 2 collections.&lt;br/&gt;
Do a rolling restart to give all nodes --shardsvr&lt;br/&gt;
Spin up a config server replset and a mongos, add the existing replset as a shard.&lt;br/&gt;
Shard one of the collections, leave the other unsharded&lt;br/&gt;
Spin up a new replica set, add it as a second shard, wait for chunks to be balanced.&lt;br/&gt;
Remove the newly added shard (will involve waiting for chunks to drain to the original shard).&lt;br/&gt;
Rolling restart the remaining shard to remove --shardsvr&lt;br/&gt;
Shut down the mongos and config servers&lt;/p&gt;

&lt;p&gt;At every phase in this process be doing some basic CRUD ops to verify that everything is still working fine.&lt;/p&gt;</comment>
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