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    <title>MongoDB Jira</title>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[CDRIVER-1958] Change in compression usage between 1.3.5 and 1.4</title>
                <link>https://jira.mongodb.org/browse/CDRIVER-1958</link>
                <project id="10030" key="CDRIVER">C Driver</project>
                    <description>&lt;p&gt;Customer created 419679 to look at performance differences between C driver 1.3.5 and 1.4. They followed up with flame graphs showing that 1.3.5 was using compression and 1.4 does not seem to be.  They note that the SSL support was rewritten in 1.4 and ask if compression by default was turned off (and if so, how to turn it back on).&lt;/p&gt;</description>
                <environment></environment>
        <key id="339796">CDRIVER-1958</key>
            <summary>Change in compression usage between 1.3.5 and 1.4</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="13202">Works as Designed</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="lorne.schachter">Lorne Schachter</reporter>
                        <labels>
                    </labels>
                <created>Mon, 19 Dec 2016 15:49:38 +0000</created>
                <updated>Fri, 27 Oct 2023 13:14:22 +0000</updated>
                            <resolved>Mon, 19 Dec 2016 15:58:09 +0000</resolved>
                                                                    <component>Performance</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1461534" author="bjori" created="Mon, 19 Dec 2016 20:58:41 +0000"  >&lt;p&gt;See &lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/blob/master/src/mongoc/mongoc-openssl.c#L472-L481&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-c-driver/blob/master/src/mongoc/mongoc-openssl.c#L472-L481&lt;/a&gt; if they want to patch the client manually.&lt;/p&gt;</comment>
                            <comment id="1461531" author="bjori" created="Mon, 19 Dec 2016 20:57:28 +0000"  >&lt;p&gt;We have no plans to add TLS Compression as an option as not all libraries we support support it, and infact the only library that currently supports it is phasing its use out and the latest versions don&apos;t support it.&lt;/p&gt;


&lt;p&gt;We are however working on wire protocol compression in clients, which can be enabled/disabled independently of TLS compression.&lt;br/&gt;
This implementation would likely work back to the current MongoDB 3.2 release, although it will likely be flagged as a MongoDB 3.4 feature.&lt;/p&gt;

&lt;p&gt;Note that this feature is in the specification process for clients, so not guaranteed just yet.&lt;/p&gt;</comment>
                            <comment id="1461099" author="bjori" created="Mon, 19 Dec 2016 15:58:09 +0000"  >&lt;p&gt;It was indeed disabled, and its not possible to enable it (see &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-1369&quot; title=&quot;Set SSL_OP_NO_COMPRESSION by default&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-1369&quot;&gt;&lt;del&gt;CDRIVER-1369&lt;/del&gt;&lt;/a&gt;).&lt;br/&gt;
Even if we would provide such switch then it would magically disappear when they upgrade to OpenSSL 1.1.0.&lt;/p&gt;

&lt;p&gt;Out of curiosity, which distribution are they running that has compression enabled? I it very difficult to find such distro these days so I&apos;d be very interesting in reproing this.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="300069">CDRIVER-1369</issuekey>
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