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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-63615] Avoid deadlocks in wiredtiger_prepare_conflict.h</title>
                <link>https://jira.mongodb.org/browse/SERVER-63615</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In preparation of &lt;a href=&quot;https://jira.mongodb.org/browse/WT-8747&quot; title=&quot;Reading between commit_timestamp and durable_timestamp can produce inconsistency&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-8747&quot;&gt;&lt;del&gt;WT-8747&lt;/del&gt;&lt;/a&gt; it was discovered after applying the preliminary patch that there is potential for deadlocking the server with the following sequence of actions:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Transaction A commits data with &lt;tt&gt;commit_timestamp=20,durable_timestamp=30&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;Transaction B begins at timestamp 25 and attempts to read data, leading to a WT_PREPARED_CONFLICT as A has not yet been made durable and waiting until another transaction commits or aborts.{{}}&lt;/li&gt;
	&lt;li&gt;Transaction B is deadlocked if there are no more transactions happening&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;To avoid this a solution is to add a timeout mechanism that will retry the method even if a transaction has not yet been committed/rolled back so that it can pick up eventually when the data has been made durable.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1982892">SERVER-63615</key>
            <summary>Avoid deadlocks in wiredtiger_prepare_conflict.h</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</assignee>
                                    <reporter username="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</reporter>
                        <labels>
                    </labels>
                <created>Mon, 14 Feb 2022 15:58:02 +0000</created>
                <updated>Thu, 24 Feb 2022 14:51:41 +0000</updated>
                            <resolved>Thu, 24 Feb 2022 14:51:41 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4374247" author="JIRAUSER1264163" created="Thu, 24 Feb 2022 14:51:41 +0000"  >&lt;p&gt;Closing the ticket as it offers dubious value&lt;/p&gt;</comment>
                            <comment id="4354006" author="daniel.gottlieb@10gen.com" created="Mon, 14 Feb 2022 17:47:13 +0000"  >&lt;p&gt;I can be convinced that there&apos;s benefit to timing out prepare conflicts to see if there was a &quot;missed notification&quot;, but I&apos;m very hesitant to make a change based on a premise that WT needs to change the change the semantics of a prepare conflict. I.e: returning a prepare conflict when there is no active prepared transction on a WT document.&lt;/p&gt;

&lt;p&gt;cc &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=louis.williams&quot; class=&quot;user-hover&quot; rel=&quot;louis.williams&quot;&gt;louis.williams&lt;/a&gt;&lt;/p&gt;</comment>
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