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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-3509] madvise(DONT_NEED) portions of oplog all slaves have synced</title>
                <link>https://jira.mongodb.org/browse/SERVER-3509</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Since we won&apos;t need that data again until after wrap-around there is no point in keeping it in the page cache.&lt;/p&gt;

&lt;p&gt;madvise(SEQUENTIAL) is probably a good idea for the whole oplog as well.&lt;/p&gt;</description>
                <environment></environment>
        <key id="20354">SERVER-3509</key>
            <summary>madvise(DONT_NEED) portions of oplog all slaves have synced</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="3">Duplicate</resolution>
                                        <assignee username="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                    </labels>
                <created>Mon, 1 Aug 2011 15:45:49 +0000</created>
                <updated>Tue, 19 Mar 2013 20:18:33 +0000</updated>
                            <resolved>Fri, 8 Mar 2013 20:42:05 +0000</resolved>
                                                                    <component>Performance</component>
                    <component>Replication</component>
                                        <votes>1</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="45639" author="redbeard0531" created="Mon, 1 Aug 2011 16:18:26 +0000"  >&lt;p&gt;I was thinking that this would only be done for ops with a timestamp lower than where all members of a replica-set have been synced to. Then even adding a new member won&apos;t cause issues because it will be pulling after that point. The only thing that would be effected is non-slaves that poll the oplog. We could add a one-minute window where anything newer won&apos;t be madvise&apos;d out. Alternatively we could disable this optimization for some period of time if we see any non-slave queries of the oplog.&lt;/p&gt;</comment>
                            <comment id="45626" author="scotthernandez" created="Mon, 1 Aug 2011 15:54:01 +0000"  >&lt;p&gt;What about secondaries pulling from other secondaries? One could pop up at any time, no?&lt;/p&gt;

&lt;p&gt;I&apos;m not suggesting this is a common case, but just raising it as a possible performance issue... but the os could cause this to be the case anyway. There is no good way to control this, without a lot more state of which node contains what data in mem.&lt;/p&gt;</comment>
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