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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-27860] Enable ShardLocal on shards</title>
                <link>https://jira.mongodb.org/browse/SERVER-27860</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently ShardLocal has invariants to only run on config servers. Safe secondary reads requires the ability to do local reads/writes, to new config.chunks.uuid collections, so these must be removed. The initialization code will also need to be changed, to create ShardLocal instances on shards, which currently cannot be happening because the ShardLocal constructor has an invariant in it to make sure it&apos;s on a config server.&lt;/p&gt;

&lt;p&gt;Specific Shard class changes:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;remove &quot;OnConfig&quot; from function names, as they&apos;ll run on shards and config servers&lt;/li&gt;
	&lt;li&gt;remove invariant checks that the server is a config server&lt;/li&gt;
	&lt;li&gt;additional unit testing&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="350394">SERVER-27860</key>
            <summary>Enable ShardLocal on shards</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Mon, 30 Jan 2017 22:29:34 +0000</created>
                <updated>Wed, 1 Mar 2017 16:04:57 +0000</updated>
                            <resolved>Wed, 1 Mar 2017 14:25:09 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1513233" author="dianna.hohensee" created="Wed, 1 Mar 2017 14:34:50 +0000"  >&lt;p&gt;Reverted preliminary work above because this task is no longer needed.&lt;/p&gt;</comment>
                            <comment id="1513230" author="dianna.hohensee" created="Wed, 1 Mar 2017 14:34:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;DiannaHohensee&apos;, u&apos;name&apos;: u&apos;Dianna Hohensee&apos;, u&apos;email&apos;: u&apos;dianna.hohensee@10gen.com&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27860&quot; title=&quot;Enable ShardLocal on shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27860&quot;&gt;&lt;del&gt;SERVER-27860&lt;/del&gt;&lt;/a&gt; remove invariants to prevent ShardLocal running on shards and remove &quot;-OnConfig&quot; function name suffixes&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit d29e95a056c2522f4bfd57e417970e7ecf18266c.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d29e95a056c2522f4bfd57e417970e7ecf18266c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d29e95a056c2522f4bfd57e417970e7ecf18266c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1497083" author="xgen-internal-githook" created="Fri, 10 Feb 2017 20:32:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;DiannaHohensee&apos;, u&apos;name&apos;: u&apos;Dianna Hohensee&apos;, u&apos;email&apos;: u&apos;dianna.hohensee@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27860&quot; title=&quot;Enable ShardLocal on shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27860&quot;&gt;&lt;del&gt;SERVER-27860&lt;/del&gt;&lt;/a&gt; remove invariants to prevent ShardLocal running on shards and remove &quot;-OnConfig&quot; function name suffixes&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/489cd07d2a3711286debae56f28416d7ba290648&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/489cd07d2a3711286debae56f28416d7ba290648&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10020">
                    <name>Gantt Dependency</name>
                                            <outwardlinks description="has to be done before">
                                        <issuelink>
            <issuekey id="349118">SERVER-27811</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="has to be done after">
                                        <issuelink>
            <issuekey id="353353">SERVER-27977</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="353893">SERVER-28012</issuekey>
        </issuelink>
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                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="350900">SERVER-27885</issuekey>
        </issuelink>
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