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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-46202] Implement ShardRegistry on top of ReadThroughCache to make it causally consistent</title>
                <link>https://jira.mongodb.org/browse/SERVER-46202</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This task is to define appropriate vector clock timestamp classes for the objects stored in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/44a107ad428459cad6260490ae98bca442e07385/src/mongo/s/client/shard_registry.h#L139&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;ShardRegistry&lt;/tt&gt;&lt;/a&gt; and to implement it on top of &lt;a href=&quot;https://github.com/mongodb/mongo/blob/44a107ad428459cad6260490ae98bca442e07385/src/mongo/util/read_through_cache.h#L45&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;ReadThroughCache&lt;/tt&gt;&lt;/a&gt; in order to make it causally consistent.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1152467">SERVER-46202</key>
            <summary>Implement ShardRegistry on top of ReadThroughCache to make it causally consistent</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="kevin.pulo@mongodb.com">Kevin Pulo</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                            <label>PM-1645-Milestone-3</label>
                    </labels>
                <created>Sat, 15 Feb 2020 08:14:44 +0000</created>
                <updated>Sun, 29 Oct 2023 22:12:06 +0000</updated>
                            <resolved>Thu, 17 Sep 2020 01:07:23 +0000</resolved>
                                                    <fixVersion>4.8.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3396439" author="xgen-internal-githook" created="Wed, 16 Sep 2020 12:54:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kevin Pulo&apos;, &apos;email&apos;: &apos;kevin.pulo@mongodb.com&apos;, &apos;username&apos;: &apos;devkev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46202&quot; title=&quot;Implement ShardRegistry on top of ReadThroughCache to make it causally consistent&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46202&quot;&gt;&lt;del&gt;SERVER-46202&lt;/del&gt;&lt;/a&gt; Implement ShardRegistry on top of ReadThroughCache&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5a1953c4ae4416a60c45c5c90a210bd84b352032&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5a1953c4ae4416a60c45c5c90a210bd84b352032&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3395751" author="xgen-internal-githook" created="Tue, 15 Sep 2020 23:32:34 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46202&quot; title=&quot;Implement ShardRegistry on top of ReadThroughCache to make it causally consistent&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46202&quot;&gt;&lt;del&gt;SERVER-46202&lt;/del&gt;&lt;/a&gt; Implement ShardRegistry on top of ReadThroughCache&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit a8913858697363a26b06996f0821045b550bea27.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/945ca4f1112f8846e793b40ff47610927b6fc298&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/945ca4f1112f8846e793b40ff47610927b6fc298&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3395635" author="tommaso.tocci" created="Tue, 15 Sep 2020 22:16:39 +0000"  >&lt;p&gt;I reverted this because it makes failing consistently &lt;a href=&quot;https://evergreen.mongodb.com/task/mongodb_mongo_master_enterprise_rhel_62_64_bit_dynamic_required_concurrency_sharded_clusterwide_ops_add_remove_shards_a8913858697363a26b06996f0821045b550bea27_20_09_15_12_38_57&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the&#160;clusterwide_ops_with_add_drop_shards.js test on the concurrency_sharded_clusterwide_ops_add_remove_shards.&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3394225" author="kevin.pulo@10gen.com" created="Tue, 15 Sep 2020 12:58:16 +0000"  >&lt;p&gt;Just a note, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tommaso.tocci&quot; class=&quot;user-hover&quot; rel=&quot;tommaso.tocci&quot;&gt;tommaso.tocci&lt;/a&gt; helped on this ticket, but when I squashed the development commits I forgot to adjust the Author and add a Co-authored-by field.&lt;/p&gt;</comment>
                            <comment id="3394202" author="xgen-internal-githook" created="Tue, 15 Sep 2020 12:39:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46202&quot; title=&quot;Implement ShardRegistry on top of ReadThroughCache to make it causally consistent&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46202&quot;&gt;&lt;del&gt;SERVER-46202&lt;/del&gt;&lt;/a&gt; Implement ShardRegistry on top of ReadThroughCache&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a8913858697363a26b06996f0821045b550bea27&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a8913858697363a26b06996f0821045b550bea27&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3321833" author="xgen-internal-githook" created="Wed, 5 Aug 2020 09:32:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kevin Pulo&apos;, &apos;email&apos;: &apos;kevin.pulo@mongodb.com&apos;, &apos;username&apos;: &apos;devkev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46202&quot; title=&quot;Implement ShardRegistry on top of ReadThroughCache to make it causally consistent&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46202&quot;&gt;&lt;del&gt;SERVER-46202&lt;/del&gt;&lt;/a&gt; Make ShardRegistryData immutable&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/403ee63aad4b5d76b2abd5e003eb77cb1dbdbf51&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/403ee63aad4b5d76b2abd5e003eb77cb1dbdbf51&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="1149645">SERVER-46154</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1308130">SERVER-47406</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1378420">SERVER-48717</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1395585">SERVER-49189</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="1578181">SERVER-53533</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10520">
                    <name>Problem/Incident</name>
                                            <outwardlinks description="causes">
                                                        </outwardlinks>
                                                        </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="1350583">SERVER-48201</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1436702">SERVER-50209</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1534735">SERVER-52633</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1534428">SERVER-52629</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="1473452">SERVER-50907</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1477943">SERVER-50997</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1473453">SERVER-50908</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1436377">SERVER-50206</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1436384">SERVER-50207</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1473451">SERVER-50906</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1473455">SERVER-50910</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
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                            <customfieldvalue><![CDATA[<s><a href='https://jira.mongodb.org/browse/SERVER-46154'>SERVER-46154</a></s>, <s><a href='https://jira.mongodb.org/browse/SERVER-47406'>SERVER-47406</a></s>, <s><a href='https://jira.mongodb.org/browse/SERVER-48717'>SERVER-48717</a></s>, <s><a href='https://jira.mongodb.org/browse/SERVER-49189'>SERVER-49189</a></s>]]></customfieldvalue>


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                            <customfieldvalue>In the past, it has been possible to manually directly remove documents from config.shards (even though the only supported/guaranteed way to remove shards is via the removeShard command), and this would &amp;quot;work&amp;quot; in the sense that the system would more-or-less keep functioning afterwards (eg. if all config.shards documents were removed, it would return to a similar state as an uninitialised (no shards added) sharded cluster).&lt;br/&gt;
&lt;br/&gt;
With this ticket that is no longer the case, the system will likely stop functioning correctly if documents are manually removed from config.shards.  Given that doing this has never been supported, and has always had undefined consequences, this is not expected to be problematic.</customfieldvalue>

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