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    <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>[SERVER-43244] delete limited expired docs in every TTL period</title>
                <link>https://jira.mongodb.org/browse/SERVER-43244</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;TTL monitor delete all the expired docs every 60 seconds.&lt;br/&gt;
Sometimes a few expired docs exist in one TTL monitor period, and lots of expired docs in the next TTL monitor period. Then a big performance degration happens as too many delete requests appears in a short time.&lt;/p&gt;

&lt;p&gt;If &apos;ttlDeleteBatch&apos; is supported, we can delete a limited number of docs in one period which is under control, then no performance degration will happen.&lt;/p&gt;</description>
                <environment></environment>
        <key id="921864">SERVER-43244</key>
            <summary>delete limited expired docs in every TTL period</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="ethan.zhang@mongodb.com">Ethan Zhang</assignee>
                                    <reporter username="pengzhenyi">peng zhenyi</reporter>
                        <labels>
                    </labels>
                <created>Tue, 10 Sep 2019 12:06:35 +0000</created>
                <updated>Sun, 5 Sep 2021 01:50:14 +0000</updated>
                            <resolved>Mon, 16 Aug 2021 15:27:13 +0000</resolved>
                                    <version>Needs Further Definition</version>
                                                    <component>TTL</component>
                                        <votes>5</votes>
                                    <watches>17</watches>
                                                                                                                <comments>
                            <comment id="2414239" author="pengzhenyi" created="Tue, 10 Sep 2019 12:14:21 +0000"  >&lt;p&gt;The pull request: &lt;a href=&quot;https://github.com/mongodb/mongo/pull/1322&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/pull/1322&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;A server parameter &apos;ttlDeleteBatch&apos; is declared to control the maximum deleted docs number every TTL period.&lt;br/&gt;
The default value is std::numeric_limits::max(), which means no limitation&lt;/p&gt;</comment>
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