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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-65039] Disable tassert in ReshardingMetricsNew</title>
                <link>https://jira.mongodb.org/browse/SERVER-65039</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="2011396">SERVER-65039</key>
            <summary>Disable tassert in ReshardingMetricsNew</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="brett.nawrocki@mongodb.com">Brett Nawrocki</assignee>
                                    <reporter username="brett.nawrocki@mongodb.com">Brett Nawrocki</reporter>
                        <labels>
                    </labels>
                <created>Tue, 29 Mar 2022 16:23:21 +0000</created>
                <updated>Sun, 29 Oct 2023 21:40:22 +0000</updated>
                            <resolved>Tue, 29 Mar 2022 19:26:31 +0000</resolved>
                                    <version>5.3 Required</version>
                                    <fixVersion>6.0.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4451786" author="xgen-internal-githook" created="Fri, 1 Apr 2022 22:03:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Brett Nawrocki&apos;, &apos;email&apos;: &apos;brett.nawrocki@mongodb.com&apos;, &apos;username&apos;: &apos;brettnawrocki&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65047&quot; title=&quot;Enable tassert in ReshardingMetricsNew, but not while upgrading from older version&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65047&quot;&gt;&lt;del&gt;SERVER-65047&lt;/del&gt;&lt;/a&gt; Strengthen guarantees for resharding aborting across FCVs&lt;/p&gt;

&lt;p&gt;Previously, resharding operations were aborted after sending the request&lt;br/&gt;
to finalize the FCV version on the shards when upgrading, making it is&lt;br/&gt;
possible that a resharding recipient will update its FCV to its target&lt;br/&gt;
value prior to aborting. It was therefore not possible to differentiate&lt;br/&gt;
a resharding operation that has upgraded to the latest version since&lt;br/&gt;
starting from one that has been the latest version throughout. For this&lt;br/&gt;
reason, the resharding operations are now aborted first.&lt;/p&gt;

&lt;p&gt;Furthermore, the resharding command currently ensures that the FCV&lt;br/&gt;
cannot change while setting up the coordinator. However, it did not&lt;br/&gt;
check to make sure that the current FCV is not currently in an upgrading&lt;br/&gt;
or downgrading state. After making the above change, this would allow&lt;br/&gt;
for the possibility for a new resharding operation to begin during an&lt;br/&gt;
FCV upgrade, after resharding operations are aborted, but before the&lt;br/&gt;
shards complete the FCV upgrade. This would have the consequence of the&lt;br/&gt;
operation running across FCVs without being aborted. As such, the&lt;br/&gt;
reshard command now fails if the current FCV is either upgrading or&lt;br/&gt;
downgrading.&lt;/p&gt;

&lt;p&gt;These changes in combination should guarantee that during a version&lt;br/&gt;
change, a new resharding operation cannot begin and a previously running&lt;br/&gt;
resharding operation always aborts completely before reaching the target&lt;br/&gt;
version. Note that it is still possible for a resharding operation to&lt;br/&gt;
reach an upgrading or downgrading FCV before being aborted.&lt;/p&gt;

&lt;p&gt;These changes were made in the interest of being able to assert that&lt;br/&gt;
newly added optional fields that should always be set were indeed set.&lt;br/&gt;
As such, this change also enables the assertion disabled by&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65039&quot; title=&quot;Disable tassert in ReshardingMetricsNew&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65039&quot;&gt;&lt;del&gt;SERVER-65039&lt;/del&gt;&lt;/a&gt;.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0425d814900d230115ea0e1b91fadf8ee2352919&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0425d814900d230115ea0e1b91fadf8ee2352919&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4443005" author="xgen-internal-githook" created="Tue, 29 Mar 2022 19:23:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Brett Nawrocki&apos;, &apos;email&apos;: &apos;brett.nawrocki@mongodb.com&apos;, &apos;username&apos;: &apos;brettnawrocki&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65039&quot; title=&quot;Disable tassert in ReshardingMetricsNew&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65039&quot;&gt;&lt;del&gt;SERVER-65039&lt;/del&gt;&lt;/a&gt; Disable tassert in ReshardingMetricsNew&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/70cfc0b74f8f9b1b3edec1adca909f7e1aae8dcf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/70cfc0b74f8f9b1b3edec1adca909f7e1aae8dcf&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2011543">SERVER-65047</issuekey>
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