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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>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-11484] Document that oplog size setting is now a soft limit</title>
                <link>https://jira.mongodb.org/browse/DOCS-11484</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Starting in 4.0, if the replication majority commit point lags past where the oplog would normally truncate, instead the oplog will grow to avoid deleting the majority commit point*. This means that the oplog size configuration is now a minimum size for the oplog, not a maximum. If writes are coming in but the majority point isn&apos;t moving (for example if secondaries aren&apos;t keeping up, or if you have a PSA set but the secondary is down), the oplog can grow past its configured size.&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;this growing behavior is actually related to the &apos;stable checkpoint timestamp&apos;, which is a pretty low level concept we probably don&apos;t want to expose to users, but it tracks the replication majority commit point pretty closely, so saying the replication commit point is probably close enough to accurate to get by.&lt;/li&gt;
&lt;/ul&gt;


&lt;h2&gt;&lt;a name=&quot;Scopeofchanges%3A&quot;&gt;&lt;/a&gt;Scope of changes:&lt;/h2&gt;

&lt;ul&gt;
	&lt;li&gt;mongod --oplogSize  and replication.oplogSizeMB&lt;/li&gt;
	&lt;li&gt;source/administration/monitoring.txt&lt;/li&gt;
	&lt;li&gt;source/administration/production-checklist-operations.txt&lt;/li&gt;
	&lt;li&gt;source/core/capped-collections.txt&lt;/li&gt;
	&lt;li&gt;source/core/replica-set-delayed-member.txt&lt;/li&gt;
	&lt;li&gt;source/core/replica-set-oplog.txt&lt;/li&gt;
	&lt;li&gt;source/reference/command/replSetResizeOplog.txt&lt;/li&gt;
	&lt;li&gt;source/reference/command/serverStatus.txt&lt;/li&gt;
	&lt;li&gt;source/reference/limits.txt&lt;/li&gt;
	&lt;li&gt;source/reference/local-database.txt&lt;/li&gt;
	&lt;li&gt;source/reference/method/db.getReplicationInfo.txt&lt;/li&gt;
	&lt;li&gt;source/tutorial/change-oplog-size.txt&lt;/li&gt;
	&lt;li&gt;source/tutorial/configure-a-delayed-replica-set-member.txt&lt;/li&gt;
	&lt;li&gt;source/tutorial/deploy-replica-set-for-testing.txt&lt;/li&gt;
	&lt;li&gt;source/tutorial/expand-replica-set.txt&lt;/li&gt;
	&lt;li&gt;source/tutorial/resync-replica-set-member.txt&lt;/li&gt;
	&lt;li&gt;source/tutorial/troubleshoot-replica-sets.txt&lt;/li&gt;
	&lt;li&gt;source/tutorial/troubleshoot-sharded-clusters.txt&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;&#160;&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;Impacttootherdocsoutsideofthisproduct%3A&quot;&gt;&lt;/a&gt;Impact to other docs outside of this product:&lt;/h2&gt;
&lt;h2&gt;&lt;a name=&quot;MVP%3A&quot;&gt;&lt;/a&gt;MVP:&lt;/h2&gt;
&lt;h2&gt;&lt;a name=&quot;Resources%3A&quot;&gt;&lt;/a&gt;Resources:&lt;/h2&gt;</description>
                <environment></environment>
        <key id="515946">DOCS-11484</key>
            <summary>Document that oplog size setting is now a soft limit</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                            <label>docs-grab-0504</label>
                    </labels>
                <created>Fri, 23 Mar 2018 21:56:06 +0000</created>
                <updated>Sun, 29 Oct 2023 13:58:09 +0000</updated>
                            <resolved>Tue, 31 Jul 2018 22:07:50 +0000</resolved>
                                                    <fixVersion>3.7.4</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due>Fri, 4 May 2018 00:00:00 +0000</due>
                            <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1962185" author="xgen-internal-githook" created="Tue, 31 Jul 2018 22:07:32 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;kay&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-11484&quot; title=&quot;Document that oplog size setting is now a soft limit&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-11484&quot;&gt;&lt;del&gt;DOCS-11484&lt;/del&gt;&lt;/a&gt;: oplog size can grow past max size&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/99a2f2c71a51d978531bd694b2b6e8a05b6e0a08&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/99a2f2c71a51d978531bd694b2b6e8a05b6e0a08&lt;/a&gt;&lt;/p&gt;</comment>
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