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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-36820] Wired Tiger Compression</title>
                <link>https://jira.mongodb.org/browse/SERVER-36820</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;We recently upgraded out MongoDB from community version 3.4.14 to 4.0.1&lt;/p&gt;

&lt;p&gt;We see that the compression ratio differs for the same type of data between the version&lt;/p&gt;

&lt;p&gt;Hence we did a test and found that compression ratio drastically fell for 3.6+&#160;&lt;/p&gt;
&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Version&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Raw size&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Storage size&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Comp Ratio&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;4.0&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;10378066324&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;1594658816&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;6.5x&lt;/td&gt;
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&lt;td class=&apos;confluenceTd&apos;&gt;3.6&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;10378066324&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;1599205376&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;6.49x&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;3.4&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;10378066324&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;634499072&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;16.35x&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
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&lt;p&gt;Can you please suggest if any changes has to be made in the configuration of MongoDB or WiredTiger?&lt;/p&gt;

&lt;p&gt;Below is the wired tiger configuration we are using&lt;/p&gt;

&lt;p&gt;wiredTiger:&lt;br/&gt;
 collectionConfig:&lt;br/&gt;
 blockCompressor: zlib&lt;br/&gt;
 engineConfig:&lt;br/&gt;
 directoryForIndexes: true&lt;br/&gt;
 journalCompressor: none&lt;br/&gt;
 cacheSizeGB: 40&lt;br/&gt;
 configString: &quot;eviction_dirty_target=60, eviction_dirty_trigger=80, eviction=(threads_min=20,threads_max=20)&quot;&lt;/p&gt;

&lt;p&gt;Thanks,&lt;/p&gt;

&lt;p&gt;Tanveer&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment>Amazon Linux</environment>
        <key id="593249">SERVER-36820</key>
            <summary>Wired Tiger Compression</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="tanveerm@xilinx.com">Tanveer Madan Marate</reporter>
                        <labels>
                            <label>compression</label>
                            <label>wiredtiger</label>
                    </labels>
                <created>Thu, 23 Aug 2018 07:24:19 +0000</created>
                <updated>Tue, 16 Nov 2021 13:50:26 +0000</updated>
                            <resolved>Thu, 23 Aug 2018 13:48:14 +0000</resolved>
                                    <version>4.0.1</version>
                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="1983940" author="tanveerm@xilinx.com" created="Thu, 23 Aug 2018 15:59:03 +0000"  >&lt;p&gt;Thanks Eric !!!&lt;/p&gt;</comment>
                            <comment id="1983932" author="milkie" created="Thu, 23 Aug 2018 15:52:43 +0000"  >&lt;p&gt;Version 4.0.2 is still unreleased, but it will be released in the coming months; watch for an announcement on the mongodb-announce google group.  The fix is also proposed for backport into the 3.6 branch.&lt;/p&gt;</comment>
                            <comment id="1983918" author="tanveerm@xilinx.com" created="Thu, 23 Aug 2018 15:41:31 +0000"  >&lt;p&gt;Hi Eric,&lt;/p&gt;

&lt;p&gt;Thanks for sharing the information !!!!&lt;/p&gt;

&lt;p&gt;I see that currently 4.0.1 is marked as the Current Stable Release on &lt;a href=&quot;https://www.mongodb.com/download-center#community&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.mongodb.com/download-center#community&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Can you share the link with me where to get 4.0.2 binaries?&lt;/p&gt;

&lt;p&gt;Thanks,&lt;/p&gt;

&lt;p&gt;Tanveer&#160;&lt;/p&gt;</comment>
                            <comment id="1983659" author="milkie" created="Thu, 23 Aug 2018 12:31:08 +0000"  >&lt;p&gt;Thank you for your report.  I believe we have fixed the compression ratio issue you are experiencing.&lt;br/&gt;
Please see the linked tickets for more info; in particular, in &lt;a href=&quot;https://jira.mongodb.org/browse/WT-3968&quot; title=&quot;Use compression ratio to tune page sizes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-3968&quot;&gt;&lt;del&gt;WT-3968&lt;/del&gt;&lt;/a&gt; we improved compression for zlib in version 4.0.2.&lt;/p&gt;</comment>
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