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            <title>[SERVER-26743] Have a pre-allocated &quot;crash zone&quot; file to more gracefully handle out of disk scenarios</title>
                <link>https://jira.mongodb.org/browse/SERVER-26743</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Of late, we&apos;ve had a rash of customer run out of disk space, and then have to perform resyncs or other actions to make their instance consistent again after freeing up some empty space.&lt;/p&gt;

&lt;p&gt;What if we made an option to pre-allocate a 2-3G &quot;crash pad&quot; file, which when we experience an out of disk scenario, we can steer records of the writes we&apos;d like to have done into that file, and then crash, with an intention of being able to restart later on, and replay the missed writes, returning us to a consistent state.&lt;/p&gt;

&lt;p&gt;This is very similar to regular journalling, but the key difference would be that the space is pre-allocated, so would be able to work around running out of space.&lt;/p&gt;

&lt;p&gt;I&apos;ve left out ~1000 implementation details I haven&apos;t worked out, mainly just noting the general thought.&lt;/p&gt;</description>
                <environment></environment>
        <key id="326356">SERVER-26743</key>
            <summary>Have a pre-allocated &quot;crash zone&quot; file to more gracefully handle out of disk scenarios</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="rod.adams@mongodb.com">Rod Adams</reporter>
                        <labels>
                    </labels>
                <created>Mon, 24 Oct 2016 15:56:42 +0000</created>
                <updated>Mon, 24 Oct 2016 18:55:14 +0000</updated>
                            <resolved>Mon, 24 Oct 2016 18:55:02 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1416008" author="rod.adams" created="Mon, 24 Oct 2016 18:55:14 +0000"  >&lt;p&gt;That it does.&lt;br/&gt;
Cool.&lt;/p&gt;</comment>
                            <comment id="1416005" author="ramon.fernandez" created="Mon, 24 Oct 2016 18:54:17 +0000"  >&lt;p&gt;This looks like a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18025&quot; title=&quot;Option to allocate disk space headroom automatically&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-18025&quot;&gt;&lt;del&gt;SERVER-18025&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="1415951" author="rod.adams" created="Mon, 24 Oct 2016 18:26:47 +0000"  >&lt;p&gt;Excellent question. I know we&apos;ve had a lot of cases like this of late (these things come in waves), but I&apos;ll have to track down if it&apos;s all MMAP, and/or some other piece. I&apos;ll get back to you.&lt;/p&gt;</comment>
                            <comment id="1415939" author="milkie" created="Mon, 24 Oct 2016 18:13:41 +0000"  >&lt;p&gt;Do you need to resync WiredTiger nodes when they run out of disk space, or does this only affect mmap?&lt;/p&gt;</comment>
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