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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-20070] Support for zero-downtime downgrade from CSRS to SCCC</title>
                <link>https://jira.mongodb.org/browse/SERVER-20070</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="226490">SERVER-20070</key>
            <summary>Support for zero-downtime downgrade from CSRS to SCCC</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="schwerin@mongodb.com">Andy Schwerin</reporter>
                        <labels>
                            <label>csrsupgrade</label>
                    </labels>
                <created>Thu, 20 Aug 2015 19:16:22 +0000</created>
                <updated>Tue, 6 Dec 2022 04:45:41 +0000</updated>
                            <resolved>Wed, 6 Jan 2016 21:41:16 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="2225848" author="ian@10gen.com" created="Fri, 26 Apr 2019 13:32:43 +0000"  >&lt;p&gt;Switching &quot;Drivers Changes Needed&quot; from &quot;Maybe&quot; to &quot;Not Needed&quot; since this was closed as something other than Fixed.&lt;/p&gt;</comment>
                            <comment id="1022230" author="jesse" created="Fri, 4 Sep 2015 02:23:28 +0000"  >&lt;p&gt;I commented in &lt;a href=&quot;https://docs.google.com/document/d/1Ic8NLIX-uiR_1_4HBdURFmhpgb3QsVH3gUdHoHmEVag/edit&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the google doc too&lt;/a&gt; but the gist is, I concur with Andy&apos;s idea: &quot;mongos closes its connections when it drops its protocol version&quot;.&lt;/p&gt;</comment>
                            <comment id="1022213" author="jeff.yemin" created="Fri, 4 Sep 2015 01:39:42 +0000"  >&lt;p&gt;To avoid silently ignoring a non-default read concern, the current plan is for drivers to report an error if a non-default read concern is requested and wire version &amp;lt; 4.  So before downgrading, users would have to remove and non-default read concern from their applications anyway.&lt;/p&gt;</comment>
                            <comment id="1022174" author="behackett" created="Fri, 4 Sep 2015 00:12:42 +0000"  >&lt;p&gt;Sounds good to me.&lt;/p&gt;</comment>
                            <comment id="1022157" author="schwerin" created="Thu, 3 Sep 2015 23:36:22 +0000"  >&lt;p&gt;I&apos;d be pretty comfortable having mongos close its connections when it &lt;b&gt;drops&lt;/b&gt; its protocol version (during downgrade from CSRS to SCCC). I&apos;m reluctant to do it on upgrade, since no harm is coming to the running clients just because new functionality became available. Presumably to harness the functionality (read concern), they&apos;d need to bounce their applications anyways.&lt;/p&gt;</comment>
                            <comment id="1022156" author="behackett" created="Thu, 3 Sep 2015 23:32:43 +0000"  >&lt;p&gt;Indeed. Perhaps the solution is to have mongos close all its client connections if we go from SCCC to CSRS or the reverse.&lt;/p&gt;</comment>
                            <comment id="1022021" author="jeff.yemin" created="Thu, 3 Sep 2015 20:52:10 +0000"  >&lt;p&gt;This may be an issue for drivers, depending on whether mongos needs to be restarted after a downgrade.  The issue is that according the the &lt;a href=&quot;https://github.com/mongodb/specifications/blob/master/source/server-discovery-and-monitoring/server-discovery-and-monitoring.rst#warning-about-the-maxwireversion-from-a-monitor-s-ismaster-response&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;SDAM spec&lt;/a&gt; drivers are required to cache maxWireVersion for the lifetime of a connection.  In the past this was safe, as maxWireVersion could never change unless a server was restarted.  But now it seems that it may be possible for mongos to dynamically lower its maxWireVersion without a restart and therefore without closing all of its connections.&lt;/p&gt;</comment>
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