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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-35657] Do not delay journal flushes when operations are waiting for oplog visibility</title>
                <link>https://jira.mongodb.org/browse/SERVER-35657</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In a recent examination of transactions performance it was observed that specific combinations of read concern, topology, and causal settings caused significant performance slowdowns for read operations. Most notably the single-node replica sets using local read concern and causal consistency. In a build failure ticket we tracked this to the following work: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31679&quot; title=&quot;Increase in disk i/o for writes to replica set&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31679&quot;&gt;&lt;del&gt;SERVER-31679&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="560870">SERVER-35657</key>
            <summary>Do not delay journal flushes when operations are waiting for oplog visibility</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="13201">Fixed</resolution>
                                        <assignee username="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="cristopher.stauffer@mongodb.com">Cristopher Stauffer</reporter>
                        <labels>
                            <label>bkp</label>
                    </labels>
                <created>Mon, 18 Jun 2018 18:41:34 +0000</created>
                <updated>Sun, 29 Oct 2023 22:30:40 +0000</updated>
                            <resolved>Fri, 24 Aug 2018 19:58:41 +0000</resolved>
                                    <version>3.6.6</version>
                    <version>4.0.0-rc5</version>
                                    <fixVersion>3.6.9</fixVersion>
                    <fixVersion>4.0.3</fixVersion>
                    <fixVersion>4.1.3</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>16</watches>
                                                                                                                <comments>
                            <comment id="2006986" author="xgen-internal-githook" created="Tue, 18 Sep 2018 18:51:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35657&quot; title=&quot;Do not delay journal flushes when operations are waiting for oplog visibility&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35657&quot;&gt;&lt;del&gt;SERVER-35657&lt;/del&gt;&lt;/a&gt; Do not delay journal flushes when operations are waiting for oplog visibility&lt;/p&gt;

&lt;p&gt;(cherry picked from commit fa0ed40e73e65a1d8715a2dcd0be22f254787bb0)&lt;/p&gt;

&lt;p&gt;Conflicts:&lt;br/&gt;
    src/mongo/db/storage/wiredtiger/wiredtiger_oplog_manager.cpp&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1dc8031b266660d3b2a0fc04c77804219df96d36&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1dc8031b266660d3b2a0fc04c77804219df96d36&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2004909" author="xgen-internal-githook" created="Mon, 17 Sep 2018 14:40:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35657&quot; title=&quot;Do not delay journal flushes when operations are waiting for oplog visibility&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35657&quot;&gt;&lt;del&gt;SERVER-35657&lt;/del&gt;&lt;/a&gt; Do not delay journal flushes when operations are waiting for oplog visibility&lt;/p&gt;

&lt;p&gt;(cherry picked from commit fa0ed40e73e65a1d8715a2dcd0be22f254787bb0)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6d34459efdf6861ab6967791193ac1108a4fe6b4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6d34459efdf6861ab6967791193ac1108a4fe6b4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1985405" author="xgen-internal-githook" created="Fri, 24 Aug 2018 19:57:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35657&quot; title=&quot;Do not delay journal flushes when operations are waiting for oplog visibility&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35657&quot;&gt;&lt;del&gt;SERVER-35657&lt;/del&gt;&lt;/a&gt; Do not delay journal flushes when operations are waiting for oplog visibility&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fa0ed40e73e65a1d8715a2dcd0be22f254787bb0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fa0ed40e73e65a1d8715a2dcd0be22f254787bb0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1982844" author="louis.williams" created="Wed, 22 Aug 2018 18:01:04 +0000"  >&lt;p&gt;A fix for this regression should be to include waiters of &#160;&lt;tt&gt;_opsBecameVisibleCV&lt;/tt&gt;&#160; when deciding whether or not delay journal flushes.&lt;/p&gt;</comment>
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