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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>[SERVER-15570] Pluggable storage engine and TTL?</title>
                <link>https://jira.mongodb.org/browse/SERVER-15570</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Will TTL indexes be supported by other storage engines?&lt;br/&gt;
While reviewing totally different things I came across:&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.query( dbName + &quot;.system.indexes&quot; ,&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;in ttl.cpp, which I believe will not work on non-mmap_v1 storage engines.&lt;/p&gt;</description>
                <environment></environment>
        <key id="162651">SERVER-15570</key>
            <summary>Pluggable storage engine and TTL?</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="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="9">Done</resolution>
                                        <assignee username="max.hirschhorn@mongodb.com">Max Hirschhorn</assignee>
                                    <reporter username="bjori">Hannes Magnusson</reporter>
                        <labels>
                            <label>28qa</label>
                    </labels>
                <created>Wed, 8 Oct 2014 19:26:38 +0000</created>
                <updated>Sat, 4 Jun 2016 00:53:15 +0000</updated>
                            <resolved>Tue, 14 Oct 2014 02:26:22 +0000</resolved>
                                                    <fixVersion>2.7.8</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="740352" author="xgen-internal-githook" created="Tue, 14 Oct 2014 02:22:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;visemet&apos;, u&apos;name&apos;: u&apos;Max Hirschhorn&apos;, u&apos;email&apos;: u&apos;max.hirschhorn@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15570&quot; title=&quot;Pluggable storage engine and TTL?&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15570&quot;&gt;&lt;del&gt;SERVER-15570&lt;/del&gt;&lt;/a&gt; Avoid querying system.indexes in ttl.cpp.&lt;/p&gt;

&lt;p&gt;Changed so that the TTL indexes are processed in multiple phases:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Acquire an IS-mode lock on the database and find all of the&lt;br/&gt;
    TTL indexes&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;  For each TTL index,&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Acquire an IX-mode lock on the collection and delete all of the&lt;br/&gt;
    expired documents&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Also avoid checking `userFlags` of collection stats in TTL index&lt;br/&gt;
tests since it is not set by some storage engines.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1a44dc6a150524de75dd46c8dc464c7182a37389&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1a44dc6a150524de75dd46c8dc464c7182a37389&lt;/a&gt;&lt;/p&gt;</comment>
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="177302">SERVER-16749</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="131787">SERVER-13635</issuekey>
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            <issuelink>
            <issuekey id="144349">SERVER-14378</issuekey>
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