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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-19745] Throttle concurrent index builds in WiredTiger</title>
                <link>https://jira.mongodb.org/browse/SERVER-19745</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Whenever the case occurs that an index build could occur simultaneously (initial sync, or via oplog using background indexes) applying to the same collection, MMAP builds the indexes in serial, while WiredTiger builds the indexes in parallel (no observed limit).&lt;/p&gt;

&lt;p&gt;This has performance implications in both directions.&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;MMAP does not make use of available hardware beyond the disk IO for a single index (despite the other indexes potentially requiring the same data).&lt;/li&gt;
	&lt;li&gt;WiredTiger can overrun the capacity of a lower powered machine (a hidden secondary for backup or analytic purposes) and end up thrashing to cause significant stalling.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This ticket is to request a review of the WiredTiger behavior to consider if some feedback on the hardware can be taken into consideration when building indexes in parallel.&lt;/p&gt;</description>
                <environment></environment>
        <key id="223989">SERVER-19745</key>
            <summary>Throttle concurrent index builds in WiredTiger</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="andrew.ryder@mongodb.com">Andrew Ryder</reporter>
                        <labels>
                    </labels>
                <created>Tue, 4 Aug 2015 04:39:53 +0000</created>
                <updated>Tue, 6 Dec 2022 04:47:03 +0000</updated>
                            <resolved>Wed, 23 May 2018 00:44:29 +0000</resolved>
                                                                    <component>Index Maintenance</component>
                    <component>Storage</component>
                    <component>WiredTiger</component>
                                        <votes>1</votes>
                                    <watches>17</watches>
                                                                                                                <comments>
                            <comment id="1898673" author="milkie" created="Tue, 22 May 2018 18:51:20 +0000"  >&lt;p&gt;In the past three years we&apos;ve made strides at reducing thrashing and stalling when WiredTiger is under load.  We&apos;re not planning on doing anything specific for throttling index builds versus any other heavy operations such as collection scans, index scans, or heavy concurrent write workloads.&lt;/p&gt;</comment>
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            <issuekey id="423300">SERVER-30939</issuekey>
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