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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-51891] Make ShardCollectionType not use strict parsing</title>
                <link>https://jira.mongodb.org/browse/SERVER-51891</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, the IDL parser for &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f48a671a94df43683f53557a62450df21b30034e/src/mongo/db/s/type_shard_collection.idl#L78&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;ShardCollectionType&lt;/tt&gt;&lt;/a&gt; doesn&apos;t specify {strict:false}, which means it explicitly performs strict parsing. This makes it impossible to add new fields to that structure.&lt;/p&gt;

&lt;p&gt;As part of this ticket we should do the following:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Add {strict:false}&lt;/li&gt;
	&lt;li&gt;Add an FCV 5.0 -&amp;gt; 4.4 downgrade step on the shards, which clears any newly added fields (e.g., &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-50027&quot; title=&quot;Freeze migrations on original sharded collection while the resharding operation is in progress&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-50027&quot;&gt;&lt;del&gt;SERVER-50027&lt;/del&gt;&lt;/a&gt;) from &lt;tt&gt;config.cache.collections&lt;/tt&gt; so that 4.4 binaries can parse them.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1528836">SERVER-51891</key>
            <summary>Make ShardCollectionType not use strict parsing</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="sergi.mateo-bellido@mongodb.com">Sergi Mateo Bellido</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                            <label>PM-1965-Cleanup</label>
                    </labels>
                <created>Fri, 30 Oct 2020 07:22:12 +0000</created>
                <updated>Sun, 29 Oct 2023 22:01:25 +0000</updated>
                            <resolved>Wed, 18 Nov 2020 07:52:16 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3495870" author="max.hirschhorn@10gen.com" created="Wed, 18 Nov 2020 16:43:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Sergi Mateo Bellido&apos;, &apos;email&apos;: &apos;sergi.mateo-bellido@mongodb.com&apos;, &apos;username&apos;: &apos;smateo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51891&quot; title=&quot;Make ShardCollectionType not use strict parsing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51891&quot;&gt;&lt;del&gt;SERVER-51891&lt;/del&gt;&lt;/a&gt; Make ShardCollectionType not use strict parsing&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Properly handling the allowMigrations field on&lt;br/&gt;
  config.cache.collections entries when downgrading to 4.4&lt;/li&gt;
	&lt;li&gt;Removing unused failpoints&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e4d6b8655dbdaf6da78104f2c547449952f49a87&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e4d6b8655dbdaf6da78104f2c547449952f49a87&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="3471179" author="xgen-internal-githook" created="Mon, 2 Nov 2020 07:46:46 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Sergi Mateo Bellido&apos;, &apos;email&apos;: &apos;sergi.mateo-bellido@mongodb.com&apos;, &apos;username&apos;: &apos;smateo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51891&quot; title=&quot;Make ShardCollectionType not use strict parsing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51891&quot;&gt;&lt;del&gt;SERVER-51891&lt;/del&gt;&lt;/a&gt; Make ShardCollectionType not use strict parsing (PART 1)&lt;/p&gt;

&lt;p&gt;This commit only takes care of removing the strict parsing of&lt;br/&gt;
ShardCollectionTypeBase. We still need to take care of the downgrading&lt;br/&gt;
process: we will have to remove the new fields so old binaries can&lt;br/&gt;
properly parse them&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4d2dea00415bf02d2b32d0474c93d251ce6568cc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4d2dea00415bf02d2b32d0474c93d251ce6568cc&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="1425075">SERVER-50027</issuekey>
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            <issuekey id="1550802">SERVER-53052</issuekey>
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