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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-12566] should we sometimes read from the non-private mmap?</title>
                <link>https://jira.mongodb.org/browse/SERVER-12566</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;to not forget the thought...can we read from non-private mmap sometimes, while others are writing to the private view?&lt;/p&gt;

&lt;p&gt;(1) this might be clean on secondaries, as the semantics are eventually consistent reads.  requiresi research though, in particular with respect to write concern acknowledgements.&lt;/p&gt;

&lt;p&gt;(2) perhaps on a primary it makes sense if a group commit is underway and we are in &apos;W&apos;, we could still query during most phases i.e., everything except during WRITETODATAFILES phase).&lt;/p&gt;

&lt;p&gt;(3) perhaps while building an index, others can still do queries with the non-private mmaps.  index builds span group commits, but that would be ok if the indication of the index&apos;s existance is written in the final commit.&lt;/p&gt;</description>
                <environment></environment>
        <key id="109010">SERVER-12566</key>
            <summary>should we sometimes read from the non-private mmap?</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="dwight@mongodb.com">Dwight Merriman</assignee>
                                    <reporter username="dwight@mongodb.com">Dwight Merriman</reporter>
                        <labels>
                    </labels>
                <created>Fri, 31 Jan 2014 21:23:46 +0000</created>
                <updated>Thu, 19 Feb 2015 16:27:52 +0000</updated>
                            <resolved>Thu, 19 Feb 2015 16:27:52 +0000</resolved>
                                                                    <component>Concurrency</component>
                    <component>Replication</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="832749" author="milkie" created="Thu, 19 Feb 2015 16:27:52 +0000"  >&lt;p&gt;WiredTiger makes this less of an issue.&lt;/p&gt;</comment>
                            <comment id="688472" author="dwight_10gen" created="Tue, 12 Aug 2014 18:56:51 +0000"  >&lt;p&gt;on the one hand with pluggable storage engine api, this seems a little less appealing as doesn&apos;t generalize fully.  that said could still be useful for existing engine when it&apos;s in use, so probably not worth eliminating as long as current storage engine exists may just be lower priority.  also an alternative append-only storage engine where there is uncommitted partial writes at the end, that aren&apos;t read, is arguably analogous; further i wonder if this is a way to do read committed semantic? but that is tricky if our definition of committed is different e.g. cluster wide commits.&lt;/p&gt;</comment>
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