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    <link>https://jira.mongodb.org</link>
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    <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-72362] Fix loops conditions in `IdempotentRenameRangeDeletionsTest`</title>
                <link>https://jira.mongodb.org/browse/SERVER-72362</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The loops in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3adaf8a55e1ad82a9a5625b4e5cc7c02267405d8/src/mongo/db/s/range_deletion_util_test.cpp#L921-L929&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this disabled test&lt;/a&gt; are executed a random number of times that may be zero.&lt;/p&gt;

&lt;p&gt;Purpose of this ticket is to re-enable the test and make sure that the loops get all executed at least once.&lt;/p&gt;

&lt;p&gt;This test is around from ages, so someone may wonder: why did it start failing only some time ago? It turns out that &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-72031&quot; title=&quot;Support calculating read distribution metrics from sampled read queries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-72031&quot;&gt;&lt;del&gt;SERVER-72031&lt;/del&gt;&lt;/a&gt; added an additional &lt;a href=&quot;https://github.com/mongodb/mongo/blob/96eca5891fe7e7fa3cdc30950530249e2c109d31/src/mongo/db/s/analyze_shard_key_read_write_distribution_test.cpp#L132&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;call to rand()&lt;/a&gt; happening before the failing unit test, shifting by one the &lt;b&gt;quite deterministic&lt;/b&gt; sequence of generated values.&lt;/p&gt;

&lt;p&gt;So the conclusion is: &lt;tt&gt;rand()&lt;/tt&gt; is not that that random after all. Let&apos;s always use &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d726a1820bef623a3220bf69bb77d8c5be069f42/src/mongo/platform/random.h#L173&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;PseudoRandom&lt;/a&gt; that is really generating random values via &lt;tt&gt;XorShift128&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2217616">SERVER-72362</key>
            <summary>Fix loops conditions in `IdempotentRenameRangeDeletionsTest`</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="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                    </labels>
                <created>Thu, 22 Dec 2022 10:52:11 +0000</created>
                <updated>Sun, 29 Oct 2023 21:28:55 +0000</updated>
                            <resolved>Thu, 22 Dec 2022 13:19:14 +0000</resolved>
                                                    <fixVersion>6.3.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5072543" author="xgen-internal-githook" created="Thu, 22 Dec 2022 13:07:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Pierlauro Sciarelli&apos;, &apos;email&apos;: &apos;pierlauro.sciarelli@mongodb.com&apos;, &apos;username&apos;: &apos;pierlauro&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-72362&quot; title=&quot;Fix loops conditions in `IdempotentRenameRangeDeletionsTest`&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-72362&quot;&gt;&lt;del&gt;SERVER-72362&lt;/del&gt;&lt;/a&gt; Fix loops conditions in `IdempotentRenameRangeDeletionsTest`&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b7689c3ec4d33eb3e9762c26e930a214dd803e43&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b7689c3ec4d33eb3e9762c26e930a214dd803e43&lt;/a&gt;&lt;/p&gt;</comment>
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