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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-4793] Enable journal by default on win32</title>
                <link>https://jira.mongodb.org/browse/SERVER-4793</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Since we don&apos;t double map on windows anyway, the justification for not journaling on 32-bit doesn&apos;t apply to win32. We just need to test that everything works correctly in this case.&lt;/p&gt;</description>
                <environment></environment>
        <key id="29279">SERVER-4793</key>
            <summary>Enable journal by default on win32</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="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="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                    </labels>
                <created>Fri, 27 Jan 2012 16:46:10 +0000</created>
                <updated>Tue, 6 Dec 2022 05:37:09 +0000</updated>
                            <resolved>Thu, 28 Sep 2017 13:50:25 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="156776" author="tad" created="Sun, 26 Aug 2012 15:06:10 +0000"  >&lt;p&gt;Windows does the same double mapping that Unix does when journaling is enabled.&lt;/p&gt;

&lt;p&gt;The main reason not to do journaling by default in 32-bit Windows is the same (more or less) as in Unix ... there isn&apos;t enough address space as it is, and journaling doubles the amount of it that gets used for memory-mapped files.&lt;/p&gt;

&lt;p&gt;The additional complication in 32-bit Windows is the problem where we have to unmap and then remap the private view as separate operations, and we can&apos;t do the trick we do on 64-bit Windows of mapping at a high address (256 GB) to prevent thread stacks and heaps from appearing in our briefly unmapped window of vulnerability.  So, 32-bit Windows with journaling will be subject to MapViewOfFileEx() failures with error 487 when a thread stack or heap is created in the location where a private view has just been unmapped.  This triggers a fatal assert.  Since this would only happen when journaling is on, you would recover on restart.&lt;/p&gt;</comment>
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