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    <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-35171] Update new_mongos_old_mongod_wire_version_clash.js</title>
                <link>https://jira.mongodb.org/browse/SERVER-35171</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;tt&gt;new_mongos_old_mongod_wire_version_clash.js&lt;/tt&gt; test expects the &lt;tt&gt;last-stable&lt;/tt&gt; version of mongo servers to issue an older wire version. But since we upgrade the wire protocol version independently of the server version, this assumption isn&apos;t always true.&lt;/p&gt;

&lt;p&gt;The test should be modified to backtrack binary versions until it finds one that uses an older wire protocol version. &lt;/p&gt;

&lt;p&gt;The test should also be unblacklisted as part of this ticket or &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35169&quot; title=&quot;Bump wire protocol version for 4.2&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35169&quot;&gt;&lt;del&gt;SERVER-35169&lt;/del&gt;&lt;/a&gt;, whichever one happens first.&lt;/p&gt;</description>
                <environment></environment>
        <key id="547753">SERVER-35171</key>
            <summary>Update new_mongos_old_mongod_wire_version_clash.js</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="blake.oler@mongodb.com">Blake Oler</assignee>
                                    <reporter username="robert.guo@mongodb.com">Robert Guo</reporter>
                        <labels>
                    </labels>
                <created>Tue, 22 May 2018 19:06:49 +0000</created>
                <updated>Tue, 31 Jul 2018 18:04:02 +0000</updated>
                            <resolved>Tue, 31 Jul 2018 18:04:02 +0000</resolved>
                                    <version>4.0.0-rc0</version>
                                                    <component>Testing Infrastructure</component>
                    <component>Upgrade/Downgrade</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1961854" author="blake.oler" created="Tue, 31 Jul 2018 18:03:19 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=cheahuychou.mao&quot; class=&quot;user-hover&quot; rel=&quot;cheahuychou.mao&quot;&gt;cheahuychou.mao&lt;/a&gt; attempted the ticket, and we both experienced issues getting older binary versions of mongos to start and connect to a last-stable binary cluster. There&apos;s probably an easy solution found with less than a day&apos;s worth of investigation. We just haven&apos;t had time to investigate the issue. The test is currently working as-is. Closing as Won&apos;t Fix.&lt;/p&gt;</comment>
                            <comment id="1951738" author="robert.guo" created="Thu, 19 Jul 2018 20:26:13 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=blake.oler&quot; class=&quot;user-hover&quot; rel=&quot;blake.oler&quot;&gt;blake.oler&lt;/a&gt; That is an interesting idea. But I&apos;m slightly concerned that it doesn&apos;t work well with the server team&apos;s current development workflow, where tests that pass are never looked at. As such, someone would have to remember to look at that test before the release (and after bumping the wire protocol version) to ensure it is doing the right thing. I fear that it&apos;s much easier to forget to do this than to have the test fail loudly after we branch, where it will definitely be noticed. The failure will only happen once a major release, so it&apos;s not particularly critical that we fix it now.&lt;/p&gt;

&lt;p&gt;Would you mind writing a sentence or two on what has been attempted and why it didn&apos;t work? (I had thought there was a CR that went by). Feel free to close the ticket as &quot;Won&apos;t Fix&quot; afterwards. We can figure out a different approach for the next release &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</comment>
                            <comment id="1951670" author="blake.oler" created="Thu, 19 Jul 2018 19:35:21 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=robert.guo&quot; class=&quot;user-hover&quot; rel=&quot;robert.guo&quot;&gt;robert.guo&lt;/a&gt; any thoughts on the aforementioned?&lt;/p&gt;</comment>
                            <comment id="1945609" author="chou.mao" created="Thu, 12 Jul 2018 15:42:21 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=greg.mckeon&quot; class=&quot;user-hover&quot; rel=&quot;greg.mckeon&quot;&gt;greg.mckeon&lt;/a&gt; It&apos;s not. I&apos;ll remove the comment above. Sorry about that.&#160;&lt;/p&gt;</comment>
                            <comment id="1945569" author="greg.mckeon" created="Thu, 12 Jul 2018 15:35:56 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=blake.oler&quot; class=&quot;user-hover&quot; rel=&quot;blake.oler&quot;&gt;blake.oler&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=cheahuychou.mao&quot; class=&quot;user-hover&quot; rel=&quot;cheahuychou.mao&quot;&gt;cheahuychou.mao&lt;/a&gt; is this in code review?  &lt;/p&gt;</comment>
                            <comment id="1943598" author="blake.oler" created="Tue, 10 Jul 2018 19:33:01 +0000"  >&lt;p&gt;I&apos;m not sure if the above behavior is actually true. Tested this out with some other team members. However, after some thinking &#8211; eventually, for every release, we will update the wire version. It would be an easier solution to let the test pass when the wire versions are the same, but explicitly log to the users in the test that we are only passing due to an ongoing server upgrade project. I&apos;ve completed a test patch as such and it works perfectly!&lt;/p&gt;</comment>
                            <comment id="1939533" author="robert.guo" created="Thu, 5 Jul 2018 16:03:21 +0000"  >&lt;blockquote&gt;
&lt;p&gt;New behavior in 4.2 causes a mongos to automatically crash upon trying to connect to an older binary.&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=blake.oler&quot; class=&quot;user-hover&quot; rel=&quot;blake.oler&quot;&gt;blake.oler&lt;/a&gt; I found &lt;tt&gt;crash_mongos_against_upgraded_cluster.js&lt;/tt&gt;, which tests the behavior of an old mongos in a new cluster. Is there a different test for a new mongos in an old cluster?&lt;/p&gt;</comment>
                            <comment id="1939403" author="blake.oler" created="Thu, 5 Jul 2018 15:23:05 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=robert.guo&quot; class=&quot;user-hover&quot; rel=&quot;robert.guo&quot;&gt;robert.guo&lt;/a&gt; New behavior in 4.2 causes a mongos to automatically crash upon trying to connect to an older binary. That behavior is expressed in other tests... maybe this test is no longer relevant on master?&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="547749">SERVER-35169</issuekey>
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