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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-64507] Substitute checkpoint mutex in WT KV Engine with smart waiting</title>
                <link>https://jira.mongodb.org/browse/SERVER-64507</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;tt&gt;_checkpointMutex&lt;/tt&gt; in wiredtiger_kv_engine.cpp is simply awaited to be locked when attempting to perform a checkpoint.&lt;/p&gt;

&lt;p&gt;In the case two threads attempt to checkpoint we would have two checkpointing actions performed one after the other. If possible we should instead replace it with something smarter that detects if someone is already checkpointing and wait and return when they finish so we don&apos;t perform another checkpoint afterwards.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2001212">SERVER-64507</key>
            <summary>Substitute checkpoint mutex in WT KV Engine with smart waiting</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</reporter>
                        <labels>
                            <label>former-storex-namer</label>
                    </labels>
                <created>Tue, 15 Mar 2022 09:33:21 +0000</created>
                <updated>Thu, 26 Oct 2023 12:51:27 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4412211" author="JIRAUSER1264163" created="Tue, 15 Mar 2022 09:34:53 +0000"  >&lt;p&gt;Suppose we have the following case:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Thread A begins a checkpoint&lt;/li&gt;
	&lt;li&gt;Thread B does some operation&lt;/li&gt;
	&lt;li&gt;Thread B begins a checkpoint attempt, sees A doing a checkpoint and waits for A to finish&lt;/li&gt;
	&lt;li&gt;Thread A finishes the checkpoint and notifies B&lt;/li&gt;
	&lt;li&gt;Thread B believes it has checkpointed its data when in fact it hasn&apos;t possibly leading to an inconsistency&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;I don&apos;t know if the given is possible with WT, but in this case we should verify that relying on Thread A&apos;s checkpoint from the perspective of Thread B does not lead to inconsistencies.&lt;/p&gt;</comment>
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            <issuekey id="2002049">SERVER-64523</issuekey>
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