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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-43757] background validate must skip indexes whose persisted and in-memory idents do not match</title>
                <link>https://jira.mongodb.org/browse/SERVER-43757</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;At the start of collection validation, we open collection and index cursors. If an index&apos;s (by name) persisted ident differs from the latest index (by name) ident, then it must be skipped.&lt;/p&gt;

&lt;p&gt;Currently, we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/62f03390c9957eba4c250eb3893b873391add3d2/src/mongo/db/catalog/validate_state.cpp#L168&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;read a PIT view of persisted collection catalog entry to find the index names&lt;/a&gt;. Then, we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/62f03390c9957eba4c250eb3893b873391add3d2/src/mongo/db/catalog/validate_state.cpp#L179&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;iterate through the in-memory indexes&lt;/a&gt;, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/62f03390c9957eba4c250eb3893b873391add3d2/src/mongo/db/catalog/validate_state.cpp#L183-L191&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;filter out any that aren&apos;t in the persisted PIT view&lt;/a&gt;, then &lt;a href=&quot;https://github.com/mongodb/mongo/blob/62f03390c9957eba4c250eb3893b873391add3d2/src/mongo/db/catalog/validate_state.cpp#L194&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;open and save cursors on the remaining indexes&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;The filtering out of indexes that are not in the PIT view is necessary for validate with {background:true} where we read from the checkpoint view. However, we have a bug when an index gets checkpoint&apos;ed, then the index is dropped (deferred, 1st phase of drop), then the index is recreated. It will appear in the checkpoint&apos;s catalog view, but then we&apos;ll read from the recreated index instead that is not checkpoint&apos;ed. Apparently, the current behavior here is to successfully read from the recreated index even if we ask for a kCheckpoint read source. Therefore, we should filter out any indexes from the PIT persisted view that has an ident that no longer matches the in-memory representation of that index (i.e. the index was recreated and is not in the checkpoint).&lt;/p&gt;</description>
                <environment></environment>
        <key id="948169">SERVER-43757</key>
            <summary>background validate must skip indexes whose persisted and in-memory idents do not match</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="13201">Fixed</resolution>
                                        <assignee username="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Oct 2019 02:05:59 +0000</created>
                <updated>Sun, 29 Oct 2023 22:16:35 +0000</updated>
                            <resolved>Fri, 4 Oct 2019 17:45:38 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2466976" author="xgen-internal-githook" created="Fri, 4 Oct 2019 17:44:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;DiannaHohensee&apos;, &apos;email&apos;: &apos;dianna.hohensee@mongodb.com&apos;, &apos;name&apos;: &apos;Dianna Hohensee&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43757&quot; title=&quot;background validate must skip indexes whose persisted and in-memory idents do not match&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43757&quot;&gt;&lt;del&gt;SERVER-43757&lt;/del&gt;&lt;/a&gt; background validate must skip indexes whose persisted and in-memory idents do not match&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c01979c362e490a0b66c3b062e516ce5e6df054c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c01979c362e490a0b66c3b062e516ce5e6df054c&lt;/a&gt;&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="871936">SERVER-42358</issuekey>
        </issuelink>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="1711537">SERVER-56877</issuekey>
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