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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-7039] Investigate improving pre-allocation on NTFS</title>
                <link>https://jira.mongodb.org/browse/SERVER-7039</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Looks like there may be support for doing this better/faster than writing zeros to the file, see:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://stackoverflow.com/questions/455297/creating-big-file-on-windows/455302#455302&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://stackoverflow.com/questions/455297/creating-big-file-on-windows/455302#455302&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;(Use the Win32 API, CreateFile, SetFilePointerEx, SetEndOfFile, and CloseHandle.)&lt;/p&gt;</description>
                <environment>Windows</environment>
        <key id="50478">SERVER-7039</key>
            <summary>Investigate improving pre-allocation on NTFS</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="benjamin.becker">Ben Becker</assignee>
                                    <reporter username="tanglebones">Clifford Hammerschmidt</reporter>
                        <labels>
                    </labels>
                <created>Thu, 13 Sep 2012 23:25:31 +0000</created>
                <updated>Mon, 19 May 2014 22:08:07 +0000</updated>
                            <resolved>Fri, 14 Sep 2012 18:51:29 +0000</resolved>
                                    <version>2.2.0</version>
                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="164580" author="benjamin.becker" created="Fri, 14 Sep 2012 18:51:10 +0000"  >&lt;p&gt;Hi Clifford,&lt;/p&gt;

&lt;p&gt;Unfortunately this approach is not currently possible because setting the file pointer to EOF doesn&apos;t actually preallocate the data on disk.  When using that approach, we found that some system calls (e.g. FlushViewOfFile) fail with lock violation errors.  See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5819&quot; title=&quot;Use FileAllocator on Windows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5819&quot;&gt;&lt;del&gt;SERVER-5819&lt;/del&gt;&lt;/a&gt; and linked tickets for details.&lt;/p&gt;

&lt;p&gt;For what it&apos;s worth, Mongo&apos;s data files do not grow, so the fragmentation issue mentioned in that link shouldn&apos;t be an issue (as far as I know).  In general, we&apos;ve found the current implementation to be fast on most machines as it performs a sequential write operation.  &lt;/p&gt;

&lt;p&gt;I&apos;m going to go ahead and close this issue out, but please feel free to reopen it if you find preallocation is significantly slower than your disk&apos;s sequential write capabilities.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Ben&lt;/p&gt;</comment>
                            <comment id="164408" author="tad" created="Fri, 14 Sep 2012 11:04:26 +0000"  >&lt;p&gt;This is a suggestion to undo the code changes we made to work around the Windows bug where FlushViewOfFile() would stall and falsely fail (return a failure code when there was no actual problem), so I don&apos;t think this would be a good change.&lt;/p&gt;</comment>
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