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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-37400] zlib compression performance degradation in 3.6, 4.0</title>
                <link>https://jira.mongodb.org/browse/SERVER-37400</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #eeeeee;border-color: #cccccc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-color: #cccccc;background-color: #6cb33f;&quot;&gt;&lt;b&gt;Issue Status as of Nov 21, 2018&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;
MongoDB may cause excessive disk space usage when Zlib compression is enabled.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;USER IMPACT&lt;/b&gt;&lt;br/&gt;
Disk space could be consumed rapidly causing out of space errors. Upgrading to a version that contains the fix will &lt;b&gt;not&lt;/b&gt; reclaim the excess disk space; for that, a re-write of the collection data with a version containing the fix is needed (e.g.: initial sync).&lt;/p&gt;

&lt;p&gt;&lt;b&gt;WORKAROUNDS&lt;/b&gt;&lt;br/&gt;
There is currently no workaround for this issue.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;AFFECTED VERSIONS&lt;/b&gt;&lt;br/&gt;
MongoDB production releases 3.6.0 through 3.6.8 as well as 4.0.0 and 4.0.1 are affected by this issue.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;FIX VERSION&lt;/b&gt;&lt;br/&gt;
This issue is fixed in MongoDB version 3.6.9 and 4.0.2 by &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;.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;RESOLUTION DETAILS&lt;/b&gt;&lt;br/&gt;
Please consider upgrading to 3.6.9 or 4.0.2 if this issue impacts you.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;</description>
                <environment></environment>
        <key id="612133">SERVER-37400</key>
            <summary>zlib compression performance degradation in 3.6, 4.0</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="ramon.fernandez@mongodb.com">Ramon Fernandez Marina</assignee>
                                    <reporter username="ramon.fernandez@mongodb.com">Ramon Fernandez Marina</reporter>
                        <labels>
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                <created>Mon, 1 Oct 2018 11:26:20 +0000</created>
                <updated>Thu, 6 Dec 2018 16:57:15 +0000</updated>
                            <resolved>Thu, 29 Nov 2018 16:55:44 +0000</resolved>
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