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<item>
            <title>[SERVER-17033] Improve performance for bulk insert into WT with under oplog back pressure</title>
                <link>https://jira.mongodb.org/browse/SERVER-17033</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Using YCSB inserting 30M documents with 24 threads I see a drop in performance between build &lt;br/&gt;
871ed2eec7a1bf2bed5bc8fc5f04a3eaa99d3fbd   and&lt;br/&gt;
612f66c61c12b705fe3c5ed251d63525f1bf650a&lt;/p&gt;

&lt;p&gt;Running a test to confirm exactly which commit it was.&lt;/p&gt;</description>
                <environment></environment>
        <key id="180571">SERVER-17033</key>
            <summary>Improve performance for bulk insert into WT with under oplog back pressure</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="3">Duplicate</resolution>
                                        <assignee username="martin.bligh">Martin Bligh</assignee>
                                    <reporter username="asya.kamsky@mongodb.com">Asya Kamsky</reporter>
                        <labels>
                            <label>WTcc</label>
                    </labels>
                <created>Sat, 24 Jan 2015 01:37:39 +0000</created>
                <updated>Mon, 31 Aug 2015 18:24:31 +0000</updated>
                            <resolved>Mon, 31 Aug 2015 18:22:39 +0000</resolved>
                                    <version>3.0.0-rc6</version>
                                                    <component>Storage</component>
                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1018476" author="martin.bligh" created="Mon, 31 Aug 2015 18:22:39 +0000"  >&lt;p&gt;Will be resolved by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19551&quot; title=&quot;Keep &amp;quot;milestones&amp;quot; against WT oplog to efficiently remove old records&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19551&quot;&gt;&lt;del&gt;SERVER-19551&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="812640" author="dan@10gen.com" created="Sun, 25 Jan 2015 03:09:30 +0000"  >&lt;p&gt;We&apos;ll leave this ticket open to examine the impact of back-pressue introduced in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16919&quot; title=&quot;Oplog can grow much larger than configured size under WiredTiger&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16919&quot;&gt;&lt;del&gt;SERVER-16919&lt;/del&gt;&lt;/a&gt; &lt;/p&gt;</comment>
                            <comment id="812508" author="dan@10gen.com" created="Sat, 24 Jan 2015 05:10:48 +0000"  >&lt;p&gt;There are other oplog performance improvements planned, but not for 3.0.0&lt;/p&gt;</comment>
                            <comment id="812507" author="dan@10gen.com" created="Sat, 24 Jan 2015 05:10:09 +0000"  >&lt;p&gt;The previous version was broken and allowing the oplog to grow unbounded.  Mathias&apos; patch keeps the oplog size within a narrow size threshold and applies back pressure, which is necessary.&lt;/p&gt;</comment>
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