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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>[JAVA-4868] Use default compression level for zstd</title>
                <link>https://jira.mongodb.org/browse/JAVA-4868</link>
                <project id="10006" key="JAVA">Java Driver</project>
                    <description>&lt;p&gt;In HELP-42011, we found that we were using the maximum compression level for zstd,&#160; 22, while the default (recommended) level was 3. The tradeoff is between speed and compression, and compression typically has diminishing returns. Other drivers use the default value, or values close to it.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2254264">JAVA-4868</key>
            <summary>Use default compression level for zstd</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="10300" iconUrl="https://jira.mongodb.org/images/icons/priorities/medium.svg">Unknown</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="13201">Fixed</resolution>
                                        <assignee username="maxim.katcharov@mongodb.com">Maxim Katcharov</assignee>
                                    <reporter username="maxim.katcharov@mongodb.com">Maxim Katcharov</reporter>
                        <labels>
                    </labels>
                <created>Mon, 6 Feb 2023 21:08:55 +0000</created>
                <updated>Sat, 28 Oct 2023 11:20:29 +0000</updated>
                            <resolved>Tue, 30 May 2023 15:06:25 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                    <fixVersion>3.12.14</fixVersion>
                                    <component>Wire Protocol</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5456300" author="xgen-internal-githook" created="Fri, 26 May 2023 20:33:34 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Ian Springer&apos;, &apos;email&apos;: &apos;ispringer@evergage.com&apos;, &apos;username&apos;: &apos;ispringer&apos;}
&lt;p&gt;Message: Use default compression level for zstd (#1116)&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/JAVA-4868&quot; title=&quot;Use default compression level for zstd&quot; class=&quot;issue-link&quot; data-issue-key=&quot;JAVA-4868&quot;&gt;&lt;del&gt;JAVA-4868&lt;/del&gt;&lt;/a&gt; backport&lt;br/&gt;
Branch: 3.12.x&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-java-driver/commit/d08b993c3b55dc2dd561e606c23bdad101b10f29&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-java-driver/commit/d08b993c3b55dc2dd561e606c23bdad101b10f29&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5456299" author="mms-build@10gen.com" created="Fri, 26 May 2023 20:33:34 +0000"  >&lt;p&gt; &lt;a href=&quot;https://github.com/ispringer&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;jyemin&lt;/a&gt; merged a pull request (&lt;a href=&quot;https://github.com/mongodb/mongo-java-driver/pull/1116&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;JAVA-4868 3.12.x backport&lt;/a&gt;) into the following branch:&lt;br/&gt;
                       3.12.x: &lt;a href=&quot;https://github.com/evergage/mongo-java-driver/commit/d08b993c3b55dc2dd561e606c23bdad101b10f29&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;d08b993c3b55dc2dd561e606c23bdad101b10f29&lt;/a&gt;&lt;/p&gt;
</comment>
                            <comment id="5428024" author="jeff.yemin" created="Tue, 16 May 2023 13:04:10 +0000"  >&lt;p&gt;Oh, you&apos;re using the callback-based API in 3.x.  Yeah, that&apos;s a lot of work to update to reactive.&lt;/p&gt;

&lt;p&gt;We&apos;ll consider backporting this.&lt;/p&gt;</comment>
                            <comment id="5428020" author="JIRAUSER1262765" created="Tue, 16 May 2023 13:02:50 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jeff.yemin%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;jeff.yemin@mongodb.com&quot;&gt;jeff.yemin@mongodb.com&lt;/a&gt;, to give a little more context, we tried rolling out enablement of network compression for our Mongo clients (app servers) into production yesterday and noticed significant increases in latency and errors in our application. We eventually realized it was likely due to this bug, as we&apos;re using v3.12.11.&#160;&lt;/p&gt;

&lt;p&gt;I actually do have a 4.x upgrade branch ready to go, but we&apos;ll have to do some canary testing before rolling it out, since it involved some significant changes to our code, particularly around refactoring to use the new reactivestreams async API. I thought I&apos;d get the ball rolling on an option B that would not require the canary testing, and I also thought you&apos;d want to cut a 3.x patch release for this, since it makes zstd network compression unusable for most applications. If you&apos;re not going to cut a release, I would at least update the docs with a warning.&lt;/p&gt;</comment>
                            <comment id="5427593" author="jeff.yemin" created="Tue, 16 May 2023 10:45:09 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ian.springer%40salesforce.com&quot; class=&quot;user-hover&quot; rel=&quot;ian.springer@salesforce.com&quot;&gt;ian.springer@salesforce.com&lt;/a&gt;, we&apos;re not currently planning any more 3.12.x patch releases? What&apos;s blocking you from upgrading to 4.x?&lt;/p&gt;</comment>
                            <comment id="5427030" author="JIRAUSER1262765" created="Tue, 16 May 2023 02:55:48 +0000"  >&lt;p&gt;Please backport to 3.12.x. Here&apos;s a PR: &lt;a href=&quot;https://github.com/mongodb/mongo-java-driver/pull/1116&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-java-driver/pull/1116&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5172181" author="xgen-internal-githook" created="Mon, 6 Feb 2023 21:24:13 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Maxim Katcharov&apos;, &apos;email&apos;: &apos;maxim.katcharov@mongodb.com&apos;, &apos;username&apos;: &apos;katcharov&apos;}
&lt;p&gt;Message: Use default compression level for zstd (#1080)&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/JAVA-4868&quot; title=&quot;Use default compression level for zstd&quot; class=&quot;issue-link&quot; data-issue-key=&quot;JAVA-4868&quot;&gt;&lt;del&gt;JAVA-4868&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-java-driver/commit/6aebed73327ee291aa55e385ee9788a90042a462&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-java-driver/commit/6aebed73327ee291aa55e385ee9788a90042a462&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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