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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-62829] query_hash_stability.js should not run in passthrough suites that do downgrades</title>
                <link>https://jira.mongodb.org/browse/SERVER-62829</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e60e92b942dada5ad4e71739b8b194b7c7ca4547/jstests/core/query_hash_stability.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;query_hash_stability.js&lt;/a&gt; integration test verifies that the &quot;planCacheKey&quot; as reported by explain remains stable for a given set of indexes. However, the plan cache key encoding is permitted to change between different versions of the server. One recent example is that the plan cache key is encoded slightly differently for queries using the SBE execution engine than for queries using the classic execution engine. Therefore, if a user downgrades from 5.2 (where SBE is enabled) to 5.0 (where SBE is disabled), then the &quot;planCacheKey&quot; will change for queries eligible for SBE.&lt;/p&gt;

&lt;p&gt;This means that query_hash_stability.js cannot run in test passthrough suites that perform downgrades while the test is running. The test could obtain the plan cache key for a query on 5.2, then a downgrade could occur, and then the test obtains the plan cache key again and expects it to remain the same as before. To prevent this from occurring we should blocklist this test from passthrough suites that involve downgrades. This includes at least the following suites:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;change_streams_downgrade&lt;/li&gt;
	&lt;li&gt;retryable_writes_downgrade&lt;/li&gt;
	&lt;li&gt;sharded_retryable_writes_downgrade&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1967969">SERVER-62829</key>
            <summary>query_hash_stability.js should not run in passthrough suites that do downgrades</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="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Thu, 20 Jan 2022 23:56:47 +0000</created>
                <updated>Sun, 29 Oct 2023 21:43:51 +0000</updated>
                            <resolved>Mon, 24 Jan 2022 15:52:05 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                    <fixVersion>5.2.1</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4310267" author="xgen-internal-githook" created="Mon, 24 Jan 2022 19:30:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;David Storch&apos;, &apos;email&apos;: &apos;david.storch@mongodb.com&apos;, &apos;username&apos;: &apos;dstorch&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62829&quot; title=&quot;query_hash_stability.js should not run in passthrough suites that do downgrades&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62829&quot;&gt;&lt;del&gt;SERVER-62829&lt;/del&gt;&lt;/a&gt; Prevent query_hash_stability.js from running in downgrade passthroughs&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 9343d1633ab6dfa162dc494e13152d13c40fb1a2)&lt;br/&gt;
Branch: v5.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6a4628b52a227e1100df8facb3a048c972debfb1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6a4628b52a227e1100df8facb3a048c972debfb1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4309480" author="xgen-internal-githook" created="Mon, 24 Jan 2022 15:50:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;David Storch&apos;, &apos;email&apos;: &apos;david.storch@mongodb.com&apos;, &apos;username&apos;: &apos;dstorch&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62829&quot; title=&quot;query_hash_stability.js should not run in passthrough suites that do downgrades&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62829&quot;&gt;&lt;del&gt;SERVER-62829&lt;/del&gt;&lt;/a&gt; Prevent query_hash_stability.js from running in downgrade passthroughs&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9343d1633ab6dfa162dc494e13152d13c40fb1a2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9343d1633ab6dfa162dc494e13152d13c40fb1a2&lt;/a&gt;&lt;/p&gt;</comment>
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