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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-10758] Strict Epoch comparison</title>
                <link>https://jira.mongodb.org/browse/SERVER-10758</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Turn on strict enforcement of OID - OID(000...) is no longer a &quot;wildcard&quot; that matches everything. This probably means we need to double-check (again) that the cluster&apos;s OIDs are well-formed. This is in preparation for enforcing the invariant that collections of different incarnations are not compatible with each other. The epoch of OID(000...) will also be changed to represent a dropped/unversioned/unsharded collection.&lt;/p&gt;

&lt;p&gt;Background:&lt;br/&gt;
The epoch portion (with type OID) of the shard/collection version in a sharded collection is used to differentiate between different incarnations of collections with the same name. For example, given the events:&lt;/p&gt;

&lt;p&gt;1. shard test.user&lt;br/&gt;
2. drop test.user&lt;br/&gt;
3. shard test.user&lt;/p&gt;

&lt;p&gt;The test.user collection in #1 &amp;amp; #3 will have different epochs.&lt;/p&gt;

&lt;p&gt;List of bugs that are known to fail existing tests when the strict comparison is enforced (ie., these needs to be fixed first before we can flip the switch):&lt;br/&gt;
1. Inside setShardVersion there is a short circuit logic for comparing zero versions, totally ignoring the epoch component &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1889f62726d1fe85339ddaccc3ea72bb499dee43/src/mongo/s/d_state.cpp#L980-984&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&lt;br/&gt;
2. There is a bug inside ChunkManager where it sets the epoch to zero if it cannot find a chunk for a shard.&lt;/p&gt;

&lt;p&gt;List of suspicious use of OID(000...) but does not cause existing tests to fail:&lt;br/&gt;
1. Inside setShardVersion, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1889f62726d1fe85339ddaccc3ea72bb499dee43/src/mongo/s/d_state.cpp#L975-978&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="89744">SERVER-10758</key>
            <summary>Strict Epoch comparison</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Fri, 13 Sep 2013 13:33:42 +0000</created>
                <updated>Mon, 11 Jul 2016 17:40:17 +0000</updated>
                            <resolved>Fri, 6 Jun 2014 14:43:22 +0000</resolved>
                                    <version>2.5.2</version>
                                    <fixVersion>2.7.2</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="465821" author="xgen-internal-githook" created="Wed, 4 Dec 2013 21:48:28 +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-10758&quot; title=&quot;Strict Epoch comparison&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-10758&quot;&gt;&lt;del&gt;SERVER-10758&lt;/del&gt;&lt;/a&gt; Strict Epoch comparison&lt;/p&gt;

&lt;p&gt;Set epoch correctly when shard does not have a chunk.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/20e58c1e87d1abd8105fac04d2fbacb215015f37&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/20e58c1e87d1abd8105fac04d2fbacb215015f37&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="89868">SERVER-10766</issuekey>
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                                        <issuelink>
            <issuekey id="90043">SERVER-10781</issuekey>
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            <issuekey id="94746">SERVER-11256</issuekey>
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