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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-52919] Wire compression not enabled for initial sync</title>
                <link>https://jira.mongodb.org/browse/SERVER-52919</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Initial sync for identical highly compressible data sets on 4.0, 4.2, 4.4:&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/287581/287581_initsync.png&quot; width=&quot;100%&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;Total bytes transferred (&quot;InOctets&quot;) is much higher for 4.4 and 4.2 than 4.0, and snappy decompressor metrics show that compression is not being used.&lt;/p&gt;

&lt;p&gt;Impact on performance is not certain as I&apos;m not sure whether this test is limited by network bandwidth, but if it is impacting performance, then&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Initial sync time for 4.2 is longer than 4.0 because of this&lt;/li&gt;
	&lt;li&gt;Initial sync time for 4.4 is a little less than than 4.0 in spite of this&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1544381">SERVER-52919</key>
            <summary>Wire compression not enabled for initial sync</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="13201">Fixed</resolution>
                                        <assignee username="amirsaman.memaripour@mongodb.com">Amirsaman Memaripour</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                            <label>sa-groomed</label>
                    </labels>
                <created>Tue, 17 Nov 2020 20:12:04 +0000</created>
                <updated>Sun, 29 Oct 2023 22:00:18 +0000</updated>
                            <resolved>Sat, 19 Dec 2020 01:03:01 +0000</resolved>
                                    <version>4.4.1</version>
                    <version>4.2.10</version>
                                    <fixVersion>4.9.0</fixVersion>
                    <fixVersion>4.2.12</fixVersion>
                    <fixVersion>4.4.4</fixVersion>
                                                        <votes>2</votes>
                                    <watches>27</watches>
                                                                                                                <comments>
                            <comment id="3547926" author="ian@10gen.com" created="Mon, 4 Jan 2021 22:02:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: u&apos;evrg-bot-webhook&apos;, &apos;name&apos;: u&apos;Amirsaman Memaripour&apos;, &apos;email&apos;: u&apos;amirsaman.memaripour@mongodb.com&apos;}
&lt;p&gt;Message:&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52919&quot; title=&quot;Wire compression not enabled for initial sync&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52919&quot;&gt;&lt;del&gt;SERVER-52919&lt;/del&gt;&lt;/a&gt; Wire compression not enabled for initial sync&lt;br/&gt;
Branch:master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/762eb95cd160aab9bec295b1e46d3c9a8ab505e2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/762eb95cd160aab9bec295b1e46d3c9a8ab505e2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3547921" author="ian@10gen.com" created="Mon, 4 Jan 2021 22:01:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: u&apos;evrg-bot-webhook&apos;, &apos;name&apos;: u&apos;Amirsaman Memaripour&apos;, &apos;email&apos;: u&apos;amirsaman.memaripour@mongodb.com&apos;}
&lt;p&gt;Message:&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52919&quot; title=&quot;Wire compression not enabled for initial sync&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52919&quot;&gt;&lt;del&gt;SERVER-52919&lt;/del&gt;&lt;/a&gt; Wire compression not enabled for initial sync&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 762eb95cd160aab9bec295b1e46d3c9a8ab505e2)&lt;br/&gt;
Branch:v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fee7b1b5b7849f0a137de86c8134e95134390509&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fee7b1b5b7849f0a137de86c8134e95134390509&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3547920" author="ian@10gen.com" created="Mon, 4 Jan 2021 22:01:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: u&apos;evrg-bot-webhook&apos;, &apos;name&apos;: u&apos;Amirsaman Memaripour&apos;, &apos;email&apos;: u&apos;amirsaman.memaripour@mongodb.com&apos;}
&lt;p&gt;Message:&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52919&quot; title=&quot;Wire compression not enabled for initial sync&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52919&quot;&gt;&lt;del&gt;SERVER-52919&lt;/del&gt;&lt;/a&gt; Wire compression not enabled for initial sync&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 762eb95cd160aab9bec295b1e46d3c9a8ab505e2)&lt;br/&gt;
Branch:v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/37e81074de8577873b515f7e7ba9ef1fbc40a93a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/37e81074de8577873b515f7e7ba9ef1fbc40a93a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3497061" author="suganthi.mani" created="Thu, 19 Nov 2020 01:53:44 +0000"  >&lt;p&gt;I think I know the reason why we are not compressing the initial sync data on 4.2+. It seems like a side-effect of initial sync using exhaust cursor.&lt;br/&gt;
Currently, we compress the response data only if the request is compressed data (see &lt;a href=&quot;https://github.com/mongodb/mongo/blob/03fb9e5576fc4aece81560ca2460116b27f0f018/src/mongo/transport/service_state_machine.cpp#L426-L477&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;). For exhaust cursor, the sync source creates a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/03fb9e5576fc4aece81560ca2460116b27f0f018/src/mongo/transport/service_state_machine.cpp#L472&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;dummy exhaust request&lt;/a&gt; which isn&apos;t compressed and the dummy request is just a copy of the original &lt;a href=&quot;https://github.com/mongodb/mongo/blob/03fb9e5576fc4aece81560ca2460116b27f0f018/src/mongo/transport/service_state_machine.cpp#L428-L430&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;decompressed getMore request&lt;/a&gt;. That&#8217;s the reason, the sync source isn&#8217;t compressing  the initial sync response data.&lt;/p&gt;

&lt;p&gt;Since this a bug in exhaust cursor, even oplog fetcher (PM-1232 which landed in 4.4) is also affected.&lt;/p&gt;</comment>
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            <issuekey id="1575785">SERVER-53473</issuekey>
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