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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-4519] WRITETOJOURNAL and WRITETODATAFILES should not block readers</title>
                <link>https://jira.mongodb.org/browse/SERVER-4519</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;we should verify this, have a test.&lt;/p&gt;

&lt;p&gt;historically they have, i believe - when writes queue up that is. however they need not &lt;br/&gt;
and may not now with the new ExcludeAllWrites class.&lt;/p&gt;

&lt;p&gt;we could simply sleep() a long time in the  writing to data fiels or journals while certain activity underway and verify we can still do queries.&lt;/p&gt;</description>
                <environment></environment>
        <key id="26865">SERVER-4519</key>
            <summary>WRITETOJOURNAL and WRITETODATAFILES should not block readers</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="9">Done</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="dwight@mongodb.com">Dwight Merriman</reporter>
                        <labels>
                    </labels>
                <created>Sun, 18 Dec 2011 18:08:37 +0000</created>
                <updated>Tue, 6 Dec 2022 05:38:18 +0000</updated>
                            <resolved>Wed, 22 Mar 2017 23:29:30 +0000</resolved>
                                                                    <component>MMAPv1</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1530818" author="geert.bosch" created="Wed, 22 Mar 2017 22:43:35 +0000"  >&lt;p&gt;This should be closed now: actual flushing and journal writing is now done in separate threads, so reads can proceed in parallel. There are still some critical sections of course, but we&apos;re not going to improve over what we have now. &lt;/p&gt;</comment>
                            <comment id="74232" author="dwight_10gen" created="Sun, 18 Dec 2011 18:21:46 +0000"  >&lt;p&gt;also, if these are bottlnecking let&apos;s be sure there are ways to tell what is up &amp;#8211; which may already be the case in the serverStatus().dur stats &amp;#8211; when tested let&apos;s look at that and see if there is sufficient telemetry to be clear on these things&lt;/p&gt;</comment>
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