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    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-19178] In WiredTiger capped collection truncates, avoid walking lists of deleted items</title>
                <link>https://jira.mongodb.org/browse/SERVER-19178</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #EEEEEE;border-color: #ccc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-color: #ccc;background-color: #6CB33F;&quot;&gt;&lt;b&gt;Issue Status as of Jul 14, 2015&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #EEEEEE;&quot;&gt;
&lt;p&gt;&lt;b&gt;ISSUE SUMMARY&lt;/b&gt;&lt;br/&gt;
Capped collection handling in WiredTiger is inefficient because of way that WiredTiger tracks and expires documents in the capped collection. &lt;/p&gt;

&lt;p&gt;WiredTiger uses a specific internal cursor to find the &quot;beginning of the capped collection&quot;. Combined with asynchronous deletion of expired capped collection records, this is inefficient for collections with high numbers of inserts because requests have to process large number of expired documents.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;USER IMPACT&lt;/b&gt;&lt;br/&gt;
Capped collection performance degrades over time. Note that the &lt;a href=&quot;http://docs.mongodb.org/manual/core/replica-set-oplog/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;oplog&lt;/a&gt; is a capped collection, so users running replica sets with WiredTiger may be impacted by this issue even if no other capped collections are used.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;RESOLUTION DETAILS&lt;/b&gt;&lt;br/&gt;
WiredTiger now caches the current &quot;first&quot; unexpired document in a capped collection. This change improves performance for all capped collections, but is particular important for the performance of replication because the oplog depends on capped collection performance.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;AFFECTED VERSIONS&lt;/b&gt;&lt;br/&gt;
MongoDB 3.0.0 through 3.0.4.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;FIX VERSION&lt;/b&gt;&lt;br/&gt;
The fix is included in the 3.0.5 production release.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h6&gt;&lt;a name=&quot;Originaldescription&quot;&gt;&lt;/a&gt;Original description&lt;/h6&gt;

&lt;p&gt;Backport part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18875&quot; title=&quot;Oplog performance on WT degrades over time after accumulation of deleted items&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-18875&quot;&gt;&lt;del&gt;SERVER-18875&lt;/del&gt;&lt;/a&gt; to MongoDB 3.0 to address the most serious performance issues with long-running workloads using capped collections.&lt;/p&gt;</description>
                <environment></environment>
        <key id="213618">SERVER-19178</key>
            <summary>In WiredTiger capped collection truncates, avoid walking lists of deleted items</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="michael.cahill@mongodb.com">Michael Cahill</assignee>
                                    <reporter username="michael.cahill@mongodb.com">Michael Cahill</reporter>
                        <labels>
                    </labels>
                <created>Mon, 29 Jun 2015 01:13:58 +0000</created>
                <updated>Thu, 10 Mar 2016 20:23:53 +0000</updated>
                            <resolved>Mon, 6 Jul 2015 01:55:25 +0000</resolved>
                                    <version>3.0.4</version>
                                    <fixVersion>3.0.5</fixVersion>
                                    <component>WiredTiger</component>
                                        <votes>1</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="955237" author="xgen-internal-githook" created="Wed, 1 Jul 2015 00:07:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;michaelcahill&apos;, u&apos;name&apos;: u&apos;Michael Cahill&apos;, u&apos;email&apos;: u&apos;michael.cahill@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19178&quot; title=&quot;In WiredTiger capped collection truncates, avoid walking lists of deleted items&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19178&quot;&gt;&lt;del&gt;SERVER-19178&lt;/del&gt;&lt;/a&gt; Fix a bug positioning cursors for capped collection truncates&lt;br/&gt;
Branch: v3.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0e10c86f515c28c626567a642ba20b93adca0459&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0e10c86f515c28c626567a642ba20b93adca0459&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="953191" author="ramon.fernandez" created="Mon, 29 Jun 2015 15:28:55 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=michael.cahill&quot; class=&quot;user-hover&quot; rel=&quot;michael.cahill&quot;&gt;michael.cahill&lt;/a&gt;, I&apos;m reopening this ticket as there are a number of failures in Evergreen related to it: &lt;a href=&quot;https://evergreen.mongodb.com/version/mongodb_mongo_v3.0_a3321c8b69b35e8d0416227bfcea97b849f1ce1f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://evergreen.mongodb.com/version/mongodb_mongo_v3.0_a3321c8b69b35e8d0416227bfcea97b849f1ce1f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="952768" author="xgen-internal-githook" created="Mon, 29 Jun 2015 03:46:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;michaelcahill&apos;, u&apos;name&apos;: u&apos;Michael Cahill&apos;, u&apos;email&apos;: u&apos;michael.cahill@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19178&quot; title=&quot;In WiredTiger capped collection truncates, avoid walking lists of deleted items&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19178&quot;&gt;&lt;del&gt;SERVER-19178&lt;/del&gt;&lt;/a&gt; In WiredTiger capped collection truncates, avoid walking lists of deleted items.&lt;br/&gt;
Branch: v3.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a3321c8b69b35e8d0416227bfcea97b849f1ce1f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a3321c8b69b35e8d0416227bfcea97b849f1ce1f&lt;/a&gt;&lt;/p&gt;</comment>
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