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    <title>MongoDB Jira</title>
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    <description>This file is an XML representation of an issue</description>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-24855] add a suite that composes continuous_config_stepdown and last_stable_mongos functionality</title>
                <link>https://jira.mongodb.org/browse/SERVER-24855</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I thought of this while writing upgrade/compatibility code for ANSA. We don&apos;t have any suite that does continuous config stepdown with a legacy mongos.&lt;/p&gt;</description>
                <environment></environment>
        <key id="297844">SERVER-24855</key>
            <summary>add a suite that composes continuous_config_stepdown and last_stable_mongos functionality</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Thu, 30 Jun 2016 19:21:50 +0000</created>
                <updated>Tue, 6 Dec 2022 04:22:33 +0000</updated>
                            <resolved>Thu, 18 Jan 2018 18:36:15 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="1778086" author="kaloian.manassiev" created="Thu, 18 Jan 2018 18:36:02 +0000"  >&lt;p&gt;I do not see how stepping down the config server in a multi-version environment would exercise the backwards compatibility code more than the regular multi-version suite already does. All the config server metadata logic is already exercised but the regular stepdown suites for the respective versions (starting in 3.2) and the metadata commands are exercised by the stepdown suite in master.&lt;/p&gt;

&lt;p&gt;Based on this I don&apos;t think such suite is valuable and I am closing this ticket as Won&apos;t Fix.&lt;/p&gt;</comment>
                            <comment id="1777923" author="dianna.hohensee" created="Thu, 18 Jan 2018 16:49:17 +0000"  >&lt;p&gt;This might be great to add to the Move Metadata Commands to Config Server project (PM-696). Specifically testing old mongos that have the metadata commands, with the new config servers that have the metadata commands, and interrupting the config server&apos;s backwards compatibility code, would be nice. Though we do already have the last stable mongos suite covering this, just not harassing the config servers with stepdown craziness, and the shards are mixed version in that suite.&lt;/p&gt;</comment>
                            <comment id="1777910" author="max.hirschhorn@10gen.com" created="Thu, 18 Jan 2018 16:42:18 +0000"  >&lt;p&gt;Thanks &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dianna.hohensee&quot; class=&quot;user-hover&quot; rel=&quot;dianna.hohensee&quot;&gt;dianna.hohensee&lt;/a&gt;, I&apos;m moving this ticket back to the Sharding team to either close as &quot;Won&apos;t fix&quot; or put it on their backlog.&lt;/p&gt;</comment>
                            <comment id="1777844" author="dianna.hohensee" created="Thu, 18 Jan 2018 16:01:30 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=max.hirschhorn&quot; class=&quot;user-hover&quot; rel=&quot;max.hirschhorn&quot;&gt;max.hirschhorn&lt;/a&gt;, this suite is about legal partially binary upgraded cluster testing. The 3.8 upgrade/downgrade work is around the FCV part of upgrade, once the cluster is fully upgrade in terms of binary version and is binary version consistent. So this is unrelated to the 3.8 upgrade/downgrade project.&lt;/p&gt;</comment>
                            <comment id="1777732" author="max.hirschhorn@10gen.com" created="Thu, 18 Jan 2018 14:36:18 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kevin.duong&quot; class=&quot;user-hover&quot; rel=&quot;kevin.duong&quot;&gt;kevin.duong&lt;/a&gt;, I think I was waiting for &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=esha.maharishi&quot; class=&quot;user-hover&quot; rel=&quot;esha.maharishi&quot;&gt;esha.maharishi&lt;/a&gt; to have been back from vacation in order to discuss it with her, but it has been so long that it&apos;s fallen off my radar. I&apos;m not currently equipped to understand the value of the proposed test suite as compared to other testing efforts around mixed-version clusters. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dianna.hohensee&quot; class=&quot;user-hover&quot; rel=&quot;dianna.hohensee&quot;&gt;dianna.hohensee&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=maria.vankeulen&quot; class=&quot;user-hover&quot; rel=&quot;maria.vankeulen&quot;&gt;maria.vankeulen&lt;/a&gt;, does this fit in anywhere with the generic upgrade/downgrade work for the 3.8 development cycle?&lt;/p&gt;</comment>
                            <comment id="1777720" author="kevin.duong" created="Thu, 18 Jan 2018 14:29:06 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=max.hirschhorn&quot; class=&quot;user-hover&quot; rel=&quot;max.hirschhorn&quot;&gt;max.hirschhorn&lt;/a&gt; What is the state of this ticket? Do we need to pull it one of TIG&apos;s iteration plannings?&lt;/p&gt;</comment>
                            <comment id="1725540" author="kaloian.manassiev" created="Tue, 14 Nov 2017 19:22:19 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=max.hirschhorn&quot; class=&quot;user-hover&quot; rel=&quot;max.hirschhorn&quot;&gt;max.hirschhorn&lt;/a&gt;, I believe we moved it to TIG more as way to get some decision from you about whether having a suite like that even makes sense. I am on the opinion that this suite doesn&apos;t give us any significant additional coverage for the extra AWS cost, but I am not strongly opposed to it.&lt;/p&gt;</comment>
                            <comment id="1724769" author="max.hirschhorn@10gen.com" created="Tue, 14 Nov 2017 00:46:38 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kaloian.manassiev&quot; class=&quot;user-hover&quot; rel=&quot;kaloian.manassiev&quot;&gt;kaloian.manassiev&lt;/a&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 is the preference of the TIG team for engineers to own introducing new test suites into Evergreen because it tends to result in their team expending the effort to stabilize it. Could you please clarify why this ticket was moved from the Sharding team? E.g. is there missing functionality to properly mix the &lt;tt&gt;sharding_continuous_config_stepdown.yml&lt;/tt&gt; and &lt;tt&gt;sharding_last_stable_mongos_and_mixed_shards.yml&lt;/tt&gt; behaviors?&lt;/p&gt;</comment>
                            <comment id="1311192" author="esha.maharishi@10gen.com" created="Thu, 30 Jun 2016 19:44:47 +0000"  >&lt;p&gt;Hmm, since some of the compatibility stuff relies on the config server responding asynchronously to commands sent by mongos, mainly that we don&apos;t get weird inconsistencies if the config primary goes down.&lt;/p&gt;</comment>
                            <comment id="1311184" author="kaloian.manassiev" created="Thu, 30 Jun 2016 19:38:43 +0000"  >&lt;p&gt;What kind of coverage are you hoping to get out of this test configuration, which we don&apos;t have when running with the latest mongos?&lt;/p&gt;</comment>
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