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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-43099] Reenable random chunk migration failpoint for concurrency with_balancer suites</title>
                <link>https://jira.mongodb.org/browse/SERVER-43099</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The random migration failpoints have possible exposed various failures and will be disabled until we investigate the BFs that were encountered. Once we have resolved these issues, the failpoint should be reenabled.&lt;/p&gt;</description>
                <environment></environment>
        <key id="913256">SERVER-43099</key>
            <summary>Reenable random chunk migration failpoint for concurrency with_balancer suites</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="13201">Fixed</resolution>
                                        <assignee username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</assignee>
                                    <reporter username="alex.taskov@mongodb.com">Alexander Taskov</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Fri, 30 Aug 2019 15:46:21 +0000</created>
                <updated>Wed, 29 Nov 2023 16:55:01 +0000</updated>
                            <resolved>Tue, 7 Feb 2023 13:35:39 +0000</resolved>
                                                    <fixVersion>6.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="5173688" author="xgen-internal-githook" created="Tue, 7 Feb 2023 13:08:16 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Serra Torrens&apos;, &apos;email&apos;: &apos;jordi.serra-torrens@mongodb.com&apos;, &apos;username&apos;: &apos;jordist&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43099&quot; title=&quot;Reenable random chunk migration failpoint for concurrency with_balancer suites&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43099&quot;&gt;&lt;del&gt;SERVER-43099&lt;/del&gt;&lt;/a&gt; Reenable random chunk migration failpoint for concurrency with_balancer suites&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9fb9d210409c00e69ec40179330fee0b28f62aec&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9fb9d210409c00e69ec40179330fee0b28f62aec&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4586740" author="JIRAUSER1268536" created="Wed, 1 Jun 2022 15:06:38 +0000"  >&lt;p&gt;Given that no pre-splitting is happening anymore and the balancer is now taking into consideration data size, the only possible &quot;random&quot; migration that can happen is moving back and forward one chunk for tests working with few or no data.&lt;/p&gt;

&lt;p&gt;Also, random move chunk workloads are anyway testing the same use case.&lt;/p&gt;

&lt;p&gt;For now, linking the ticket to PM-2652 because the &quot;random chunk migration&quot; test behaviour should be rethink after the future new balancer implementation.&lt;/p&gt;</comment>
                            <comment id="4290214" author="JIRAUSER1257318" created="Thu, 13 Jan 2022 08:51:26 +0000"  >&lt;p&gt;In addition to the failures mentioned above, there&apos;s still one test failure pending to be understood:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;jstests/concurrency/fsm_workloads/server_status_with_time_out_cursors.js (in this &lt;a href=&quot;https://spruce.mongodb.com/task/mongodb_mongo_master_enterprise_rhel_80_64_bit_dynamic_required_concurrency_sharded_replication_with_balancer_4_enterprise_rhel_80_64_bit_dynamic_required_patch_32a1cab2757c53fd29c4d9909fa3b0f07ecfac03_61dbfa2a56234317d23ae3e2_22_01_10_09_20_35/tests?execution=2&amp;amp;sortBy=STATUS&amp;amp;sortDir=ASC&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;patch&lt;/a&gt;)&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Understood ^: The test leaves idle cursors opens. This makes the stopBalancer/checkOrphans checks at the end of the fixture hang, because the rangeDeleter cannot progress due to the open cursors.&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62710&quot; title=&quot;AsyncRequestsMerger won&amp;#39;t attempt to cleanup shard cursors when deadline is exceeded&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62710&quot;&gt;&lt;del&gt;SERVER-62710&lt;/del&gt;&lt;/a&gt; tracks this.&lt;/p&gt;</comment>
                            <comment id="2487619" author="blake.oler" created="Thu, 17 Oct 2019 20:38:49 +0000"  >&lt;p&gt;Note that when we re-enable the random balancer policy, we may have to create a way for workloads to opt out of the randomness, such as the workload in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44062&quot; title=&quot;Add zone operations concurrency testing for refineCollectionShardKey&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44062&quot;&gt;&lt;del&gt;SERVER-44062&lt;/del&gt;&lt;/a&gt;, which will assert that the balancer works properly.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
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                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="913735">SERVER-43106</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="918541">SERVER-43196</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1933717">SERVER-61742</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1934816">SERVER-61769</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1965785">SERVER-62710</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2237075">SERVER-73032</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2245307">SERVER-73385</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2245317">SERVER-73388</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="901102">SERVER-42914</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1934617">SERVER-61759</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1939392">SERVER-61810</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1939400">SERVER-61811</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1940536">SERVER-61835</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1940646">SERVER-61840</issuekey>
        </issuelink>
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                    <name>Problem/Incident</name>
                                            <outwardlinks description="causes">
                                        <issuelink>
            <issuekey id="2270996">SERVER-74235</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2453422">SERVER-81517</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2263957">SERVER-73973</issuekey>
        </issuelink>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="913744">SERVER-43107</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="2246775">SERVER-73434</issuekey>
        </issuelink>
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