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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-64925] Use block compression for secondary indexes on clustered collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-64925</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We don&apos;t use WiredTiger block compression for secondary indexes on non-clustered collections because we already use prefix compression and the stored RecordIds are pretty compact.&lt;/p&gt;

&lt;p&gt;Clustered collections have larger RecordIds which take up more space, but may compress better.&lt;/p&gt;

&lt;p&gt;We should evaluate using block compression for secondary indexes on clustered collections to reduce storage size.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2008879">SERVER-64925</key>
            <summary>Use block compression for secondary indexes on clustered collections</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                            <label>clustered_collections</label>
                            <label>former-storex-namer</label>
                    </labels>
                <created>Fri, 25 Mar 2022 08:57:30 +0000</created>
                <updated>Thu, 26 Oct 2023 12:51:54 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4975360" author="connie.chen" created="Fri, 11 Nov 2022 19:37:50 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=michael.gargiulo%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;michael.gargiulo@mongodb.com&quot;&gt;michael.gargiulo@mongodb.com&lt;/a&gt; - taking this out of the desired bucket and throwing it into the backlog. Let us know if we should reconsider&lt;/p&gt;</comment>
                            <comment id="4875528" author="louis.williams" created="Tue, 4 Oct 2022 07:52:11 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=matthew.saltz%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;matthew.saltz@mongodb.com&quot;&gt;matthew.saltz@mongodb.com&lt;/a&gt;, the existing workload only creates &lt;a href=&quot;https://github.com/mongodb/genny/blob/master/src/phases/execution/ClusteredCollection.yml&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;one secondary index&lt;/a&gt;. We could potentially create a new workload with more indexes, but I would start by looking at that workload first. There is a version of the workload that uses &lt;a href=&quot;https://github.com/mongodb/genny/blob/12fa03bb9567aa7a9c6e6902dfb71ae155368206/src/workloads/execution/ClusteredCollectionLargeRecordIds.yml&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;larger RecordIds&lt;/a&gt;, which would be an interesting point of comparison between that and the one with smaller RecordIds.&lt;/p&gt;

&lt;p&gt;Also, I Consider these other challenges&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;If the workload is entirely in cache, which is likely, then we won&apos;t be observing the cost of decompression, only the cost of compression. We may want to consider running with a smaller cache size for comparison. This would be easist done locally.&lt;/li&gt;
	&lt;li&gt;I&apos;m not sure that Genny saves the data files, so you may need to run locally to check the size of the indexes anyways.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;So no, I don&apos;t think we necessarily need a new workload. Some local testing could answer the questions that we&apos;re after. &lt;/p&gt;</comment>
                            <comment id="4874604" author="matthew.saltz" created="Mon, 3 Oct 2022 21:03:36 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=louis.williams%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;louis.williams@mongodb.com&quot;&gt;louis.williams@mongodb.com&lt;/a&gt; For performance testing, do you think existing sys-perf workloads will be sufficient or will we need to write targeted tests for this?&lt;/p&gt;</comment>
                            <comment id="4442186" author="connie.chen" created="Tue, 29 Mar 2022 15:54:19 +0000"  >&lt;p&gt;We&apos;ll want to evaluate the performance tradeoffs before commit&lt;/p&gt;</comment>
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            <issuekey id="2033562">SERVER-65976</issuekey>
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