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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-442] durability: sync files to disk every minute, configurable</title>
                <link>https://jira.mongodb.org/browse/SERVER-442</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="10922">SERVER-442</key>
            <summary>durability: sync files to disk every minute, configurable</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="9">Done</resolution>
                                        <assignee username="eliot">Eliot Horowitz</assignee>
                                    <reporter username="eliot">Eliot Horowitz</reporter>
                        <labels>
                    </labels>
                <created>Fri, 27 Nov 2009 22:21:40 +0000</created>
                <updated>Tue, 12 Jul 2016 00:29:11 +0000</updated>
                            <resolved>Fri, 27 Nov 2009 22:27:47 +0000</resolved>
                                                    <fixVersion>1.1.4</fixVersion>
                                    <component>Stability</component>
                                        <votes>0</votes>
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                                                                                                                <comments>
                            <comment id="11356" author="eliot" created="Sun, 13 Dec 2009 08:45:39 +0000"  >&lt;p&gt;This is not meant to solve durability&lt;br/&gt;
there are certain cases where this is very helpful though. For  example when running on a laptop that runs out of battery life. &lt;br/&gt;
Repair still has to be run of course. &lt;/p&gt;</comment>
                            <comment id="11355" author="ivoras" created="Sun, 13 Dec 2009 08:21:13 +0000"  >&lt;p&gt;If there are any dynamic data structures in the mmaped region (e.g. trees, hashes, etc), this change will not help durability at all if the mmaped region is left to be partially synced on-demand by the operating system&apos;s VM system between fsync()s (this is very easy to see if you think about it). And there is no way to create an always-synchronous mechanism of storage with mmap(). &lt;/p&gt;

&lt;p&gt;In terms of durability, calling fsync() every minute in these circumstances is a no-op.&lt;/p&gt;</comment>
                            <comment id="11229" author="auto" created="Fri, 27 Nov 2009 22:28:30 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Eliot Horowitz&apos;, &apos;email&apos;: &apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: durability: added occasinal file sync&lt;br/&gt;
default: sync every 60 seconds, confiruable with syncdelay&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-442&quot; title=&quot;durability: sync files to disk every minute, configurable&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-442&quot;&gt;&lt;del&gt;SERVER-442&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/c44bff08fd95616302a73e92b48b2853c1fd948d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/c44bff08fd95616302a73e92b48b2853c1fd948d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="11228" author="eliot" created="Fri, 27 Nov 2009 22:27:47 +0000"  >&lt;p&gt;defaults to every minute.&lt;br/&gt;
configurable with --syncdelay&lt;/p&gt;</comment>
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