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    <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-51330] StorageTimestampTests depends on oplog batch writer thread scheduling</title>
                <link>https://jira.mongodb.org/browse/SERVER-51330</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9b8d4c2f029e2384fa769014c00091e4de362ea4/src/mongo/dbtests/storage_timestamp_tests.cpp#L1391&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;SecondarySetWildcardIndexMultikeyOnInsert test case&lt;/a&gt; tries to &quot;coerce&quot; the oplog batch writer into interleaving operations in a certain way:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// Coerce oplog application to apply op2 before op1.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        std::vector&amp;lt;repl::OplogEntry&amp;gt; ops = {op0, op2, op1};&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;
&lt;p&gt;Unfortunately, the batch applier splits up operations across many threads based on a hash of _id and a runtime-randomized seed, so this coercion is fruitless. If op1 and op2 end up in the same batch, they will be inserted in the same transaction, which will return this error from WiredTiger: &quot;commit timestamp &amp;lt;op1&amp;gt; older than the first commit timestamp &amp;lt;op2&amp;gt;&quot;, and trigger this &lt;a href=&quot;https://github.com/mongodb/mongo/blob/84494ea46f70d64e181042ed75a0118143b16881/src/mongo/db/storage/wiredtiger/wiredtiger_record_store.cpp#L1493&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;fatal assertion&lt;/a&gt; in MongoDB.&lt;/p&gt;

&lt;p&gt;This test needs to be rewritten so that it does not batch out-of-order operations together or depend on thread synchronization.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Bonus!&lt;/b&gt; Because of the way the hash seed is randomized to split up operations to 16 different threads, the probability of this test putting op2 and op1 in the same batch is 1/16. So theoretically this test will fail 6.25% of the time it is run.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1499391">SERVER-51330</key>
            <summary>StorageTimestampTests depends on oplog batch writer thread scheduling</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="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Fri, 2 Oct 2020 20:49:58 +0000</created>
                <updated>Sun, 29 Oct 2023 22:02:26 +0000</updated>
                            <resolved>Mon, 5 Oct 2020 21:52:30 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                    <fixVersion>4.4.5</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3672325" author="xgen-internal-githook" created="Thu, 18 Mar 2021 21:28:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51330&quot; title=&quot;StorageTimestampTests depends on oplog batch writer thread scheduling&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51330&quot;&gt;&lt;del&gt;SERVER-51330&lt;/del&gt;&lt;/a&gt; SecondarySetWildcardIndexMultikeyOnInsert should prevent insert operations from being grouped together in the same WriteUnitOfWork&lt;/p&gt;

&lt;p&gt;(cherry picked from commit a589011c8a802cad912d33b125bc9028fd23acad)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/927b3a649c421bac2f58f617702c138a13dff85c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/927b3a649c421bac2f58f617702c138a13dff85c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3426503" author="xgen-internal-githook" created="Mon, 5 Oct 2020 20:33:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51330&quot; title=&quot;StorageTimestampTests depends on oplog batch writer thread scheduling&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51330&quot;&gt;&lt;del&gt;SERVER-51330&lt;/del&gt;&lt;/a&gt; SecondarySetWildcardIndexMultikeyOnInsert should prevent insert operations from being grouped together in the same WriteUnitOfWork&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a589011c8a802cad912d33b125bc9028fd23acad&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a589011c8a802cad912d33b125bc9028fd23acad&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3423864" author="louis.williams" created="Fri, 2 Oct 2020 21:13:11 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=daniel.gottlieb&quot; class=&quot;user-hover&quot; rel=&quot;daniel.gottlieb&quot;&gt;daniel.gottlieb&lt;/a&gt;&#160;suggested modifying the test to use updates instead of inserts. This would guarantee that the writes are not batched together in the same WUOW.&lt;/p&gt;

&lt;p&gt;Additionally, &quot;The test was designed to allow for false negatives (didn&apos;t catch the bug when it should have) but not false positives&quot;&lt;/p&gt;</comment>
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