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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-71026] Find better solution to check for stale config during step up (catalog shard POC)</title>
                <link>https://jira.mongodb.org/browse/SERVER-71026</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The problem is related to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70850&quot; title=&quot;Replication signalDrainComplete is stuck in catalog shard POC&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70850&quot;&gt;&lt;del&gt;SERVER-70850&lt;/del&gt;&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70487&quot; title=&quot;Fix the test delete_range_deletion_tasks_on_stepup_after_drop_collection.js for catalog shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70487&quot;&gt;&lt;del&gt;SERVER-70487&lt;/del&gt;&lt;/a&gt;. The targeted scenario is when the chunk migration is interrupted by simultaneous donor and config server step down (read catalog shard). In this case the recipient will be stuck waiting for the interruption from critical section.&lt;/p&gt;

&lt;p&gt;The donor responsibility is to send _configsvrEnsureChunkVersionIsGreaterThan to the config server and then _recvChunkReleaseCritSec to the recipient. Until the recipient is interrupted with this _recvChunkReleaseCritSec command it will remain deadlocked with config server&apos;s Balancer starting and waiting for all move chunk participants to exit the critical section, while the recipient will not exit the critical section until something tells it. This may prevent the Balancer to be stuck in the init() method for minutes.&lt;/p&gt;

&lt;p&gt;The attached fix is not super clean. It amends the PeriodicShardedIndexConsistencyChecker::onStepUp() the following waiy:&lt;/p&gt;


&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;if&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; (serverGlobalParams.clusterRole == ClusterRole::CatalogShard &amp;amp;&amp;amp;&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            _shardedIndexConsistencyChecker.isValid()) {&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            ...&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            _shardedIndexConsistencyChecker.stop();&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            _shardedIndexConsistencyChecker.detach();&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        }&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;The reason is that the Index consistency checker is scanning all collections and generates the StaleConfigInfo on collection which shard is stuck in critical section. Then this error will make the _recvChunkReleaseCritSec to be sent to the recipient. I think there should be a cleaner way to force the check to generate the StaleConfigInfo. The one I did works but is not clean.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2173413">SERVER-71026</key>
            <summary>Find better solution to check for stale config during step up (catalog shard POC)</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="13203">Gone away</resolution>
                                        <assignee username="backlog-server-sharding-nyc">[DO NOT USE] Backlog - Sharding NYC</assignee>
                                    <reporter username="andrew.shuvalov@mongodb.com">Andrew Shuvalov</reporter>
                        <labels>
                            <label>sharding-nyc-subteam2</label>
                            <label>sharding-nyc-subteam2-catalog-poc</label>
                    </labels>
                <created>Wed, 2 Nov 2022 18:25:30 +0000</created>
                <updated>Fri, 27 Oct 2023 20:45:05 +0000</updated>
                            <resolved>Thu, 9 Feb 2023 22:19:24 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5184737" author="jack.mulrow" created="Thu, 9 Feb 2023 22:19:24 +0000"  >&lt;p&gt;Issue in the POC implementation that has not been seen since, so closing as gone away.&lt;/p&gt;</comment>
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