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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-29027] Allow collections in the config database to be sharded</title>
                <link>https://jira.mongodb.org/browse/SERVER-29027</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The logical sessions project requires the ability to create a new sharded system collection in the config database.  This is currently not possible.&lt;/p&gt;</description>
                <environment></environment>
        <key id="379242">SERVER-29027</key>
            <summary>Allow collections in the config database to be sharded</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="13201">Fixed</resolution>
                                        <assignee username="samantha.ritter@mongodb.com">Samantha Ritter</assignee>
                                    <reporter username="samantha.ritter@mongodb.com">Samantha Ritter</reporter>
                        <labels>
                    </labels>
                <created>Mon, 1 May 2017 17:19:33 +0000</created>
                <updated>Mon, 30 Oct 2023 23:17:06 +0000</updated>
                            <resolved>Thu, 28 Sep 2017 19:10:33 +0000</resolved>
                                                    <fixVersion>3.6.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1684560" author="xgen-internal-githook" created="Thu, 28 Sep 2017 18:59:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;samantha.ritter@10gen.com&apos;, &apos;name&apos;: &apos;samantharitter&apos;, &apos;username&apos;: &apos;samantharitter&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29027&quot; title=&quot;Allow collections in the config database to be sharded&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29027&quot;&gt;&lt;del&gt;SERVER-29027&lt;/del&gt;&lt;/a&gt; Allow collections in the config db to be sharded&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ba7208d5724dd53f10f360a2aece4d39e79e6638&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ba7208d5724dd53f10f360a2aece4d39e79e6638&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1646419" author="schwerin" created="Fri, 11 Aug 2017 17:11:59 +0000"  >&lt;p&gt;Oh, great.&lt;/p&gt;</comment>
                            <comment id="1646410" author="kaloian.manassiev" created="Fri, 11 Aug 2017 17:03:57 +0000"  >&lt;p&gt;The &apos;config&apos; shard is always present on the shard registry, so this shouldn&apos;t be a problem. For the config and admin databases not having entry in the catalog cache, we always return a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/s/catalog/sharding_catalog_client_impl.cpp#L390&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;hardcoded result&lt;/a&gt;, so these databases magically exist as well.&lt;/p&gt;</comment>
                            <comment id="1646401" author="schwerin" created="Fri, 11 Aug 2017 16:52:30 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kaloian.manassiev&quot; class=&quot;user-hover&quot; rel=&quot;kaloian.manassiev&quot;&gt;kaloian.manassiev&lt;/a&gt;, isn&apos;t the hard part that the config server itself doesn&apos;t appear in `config.shards`? And that the `config` database doesn&apos;t have an entry in `config.dbs` or whatever it&apos;s called?&lt;/p&gt;</comment>
                            <comment id="1644050" author="kaloian.manassiev" created="Wed, 9 Aug 2017 14:14:01 +0000"  >&lt;p&gt;I propose that we implement this by marking the &lt;tt&gt;config.system.sessions&lt;/tt&gt; collection as sharded in the metadata, like we do for any other sharded collection, but we also hardcode knowledge in the balancer policy that no chunks for any sharded collection residing under &lt;tt&gt;config&lt;/tt&gt; or &lt;tt&gt;admin&lt;/tt&gt; may be moved to the &lt;tt&gt;config&lt;/tt&gt; shard. This will ensure that both auto-balancing and moveChunk will not violate this policy and will also make this backwards-compatible with 3.4.&lt;/p&gt;

&lt;p&gt;If users manually modify the routing information, the server will start returning errors for any attempt to cache this routing information, which would only make creating sessions impossible, but the remaining collections will be able to be accessed.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;TL;DR:&lt;/b&gt; With the ability of shards to store copy of the routing metadata for the purposes of consistent secondary reads, it is currently not possible to treat the config server as just another shard. This is because it holds the authoritative copy of the routing information in a format which differs from that of the shards. It might be possible to do safe secondary reads by tweaking the &lt;tt&gt;ConfigServerCatalogCacheLoader&lt;/tt&gt;, however for the purposes of being able to shard the &lt;tt&gt;config.system.sessions&lt;/tt&gt; collection in time for the 3.6 release we can do this intermediate solution. This brings us one step closer to treating the config server as a shard.&lt;/p&gt;

&lt;p&gt;cc &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=schwerin&quot; class=&quot;user-hover&quot; rel=&quot;schwerin&quot;&gt;schwerin&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alyson.cabral&quot; class=&quot;user-hover&quot; rel=&quot;alyson.cabral&quot;&gt;alyson.cabral&lt;/a&gt; about whether there are any objections to implementing this behaviour. I estimate that implementing this would take roughly about 1-2 weeks for a single developer working on it 100% of the time, including writing targeted JS tests.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="430052">SERVER-31184</issuekey>
        </issuelink>
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                                    </issuelinktype>
                            <issuelinktype id="10320">
                    <name>Documented</name>
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            <issuekey id="439935">DOCS-10861</issuekey>
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                            <issuelinktype id="10020">
                    <name>Gantt Dependency</name>
                                            <outwardlinks description="has to be done before">
                                        <issuelink>
            <issuekey id="365321">SERVER-28344</issuekey>
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