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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-48143] Remove support for &apos;fsync&apos; flag in writeConcern specifications leftover from mmap</title>
                <link>https://jira.mongodb.org/browse/SERVER-48143</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &apos;fsync&apos; flag in writeConcern is undocumented since mmap was removed. Eric managed to find this old documentation that mentions the fsync flag: &lt;a href=&quot;https://docs.mongodb.com/v2.2/reference/command/getLastError/#dbcmd.getLastError&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/v2.2/reference/command/getLastError/#dbcmd.getLastError&lt;/a&gt;. WT does still act on it, however.&lt;/p&gt;

&lt;p&gt;We still parse it from user writeConcern &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e2602ad053b2120982fbcac8e33e1ad64e6ec30a/src/mongo/db/write_concern_options.cpp#L153-L165&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; and act on that flag in waiting for write concern &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e2602ad053b2120982fbcac8e33e1ad64e6ec30a/src/mongo/db/write_concern.cpp#L307-L310&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. flushAllFiles (that fsync flagged write concern calls) behaves differently in the WT integration layer code than a regular j:true flag: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e2602ad053b2120982fbcac8e33e1ad64e6ec30a/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp#L1018-L1029&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;we explicitly take a checkpoint instead of flushing the journal&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1348415">SERVER-48143</key>
            <summary>Remove support for &apos;fsync&apos; flag in writeConcern specifications leftover from mmap</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="michael.gargiulo@mongodb.com">Michael Gargiulo</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Tue, 12 May 2020 16:38:01 +0000</created>
                <updated>Thu, 14 Apr 2022 16:19:32 +0000</updated>
                                                                            <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
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