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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-67165] Bug in tenant_migration_concurrent_reads_on_donor.js</title>
                <link>https://jira.mongodb.org/browse/SERVER-67165</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;tt&gt;testUnblockBlockedReadsAfterMigrationAborted&lt;/tt&gt; (and possibly other test cases) there is a possible race condition that would lead to a deadlock, and the test does not really work as intended. We want to run some commands on the primary &amp;amp; secondaries during the migration, then unblock the migration and check the result.&lt;/p&gt;

&lt;p&gt;We start by getting the primary and starting a migration (with a failpoint to stall it). Then start a resume thread that will unblock the migration once the tenant access blocker (on the primary only) will see a read of 1. In the test we run a command on each node in sequence. As the first node is normally the primary, the following will happen :&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Do the read on the primary. This blocks the test thread.&lt;/li&gt;
	&lt;li&gt;Read count increased by 1 for the tenant Id on the primary&lt;/li&gt;
	&lt;li&gt;Resume thread sees the increase on the primary, it unblocks the migration,&lt;/li&gt;
	&lt;li&gt;The migration completes.&lt;/li&gt;
	&lt;li&gt;The read command returns in the main thread, it checks the return value.&lt;/li&gt;
	&lt;li&gt;The read command is done on each secondary, that does not block.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;If due to a stepdown or another issue the first node is not the primary, the test will hang as the read count on the primary won&apos;t increase. We can test it with the following modification :&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;
&lt;p/&gt;
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						&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: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;const&lt;/span&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; db = nodes[&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&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;].getDB(dbName);    runCommand(db, command, &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;null&lt;/span&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;, testCase.isTransaction);&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 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;   &lt;/span&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;// nodes.forEach(node =&amp;gt; {  //      const db = node.getDB(dbName);  //      runCommand(db, command, null, testCase.isTransaction);  //  });&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="2065572">SERVER-67165</key>
            <summary>Bug in tenant_migration_concurrent_reads_on_donor.js</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-serverless">[DO NOT USE] Backlog - Server Serverless</assignee>
                                    <reporter username="didier.nadeau@mongodb.com">Didier Nadeau</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Thu, 9 Jun 2022 22:27:54 +0000</created>
                <updated>Wed, 4 Oct 2023 18:23:31 +0000</updated>
                            <resolved>Wed, 4 Oct 2023 18:23:30 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>1</watches>
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