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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-39498] ShardRegistry reload inside onReplicationRollback can get stuck</title>
                <link>https://jira.mongodb.org/browse/SERVER-39498</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Repro scenario:&lt;br/&gt;
1. Rollback occurred.&lt;br/&gt;
2. Periodic shard registry reload tries to perform shard reload. It is done with majority readConcern and the latest configOpTime. However, since a rollback just occurred, configOpTime &amp;gt; lastAppliedOpTime, so the reload will block.&lt;br/&gt;
3. Rollback finishes fixing the oplog and record store. Now calls the OpObserverImpl::onReplicationRollback.&lt;br/&gt;
4. Rollback thread tries to call ShardRegistry reload, but since the periodic reload thread is in the middle of reload, it just tries to wait for it to finish. And this causes cyclic dependency since the opTime won&apos;t advance until the rollback thread finishes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="687774">SERVER-39498</key>
            <summary>ShardRegistry reload inside onReplicationRollback can get stuck</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="matthew.saltz@mongodb.com">Matthew Saltz</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Mon, 11 Feb 2019 19:38:51 +0000</created>
                <updated>Sun, 29 Oct 2023 22:24:11 +0000</updated>
                            <resolved>Wed, 8 May 2019 18:51:16 +0000</resolved>
                                    <version>4.1.7</version>
                                    <fixVersion>4.1.11</fixVersion>
                    <fixVersion>4.0.19</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3068007" author="xgen-internal-githook" created="Mon, 4 May 2020 20:16:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Saltz&apos;, &apos;email&apos;: &apos;matthew.saltz@mongodb.com&apos;, &apos;username&apos;: &apos;saltzm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39498&quot; title=&quot;ShardRegistry reload inside onReplicationRollback can get stuck&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39498&quot;&gt;&lt;del&gt;SERVER-39498&lt;/del&gt;&lt;/a&gt; Make rollback trigger a lazy (rather than blocking) reload of the ShardRegistry&lt;/p&gt;

&lt;p&gt;(cherry picked from commit d3ee35d6e3ac7a42cd5ad106c3ecb9fb554900c7)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cc923b4e66e0c76714f877b33ce9fd5f28e17f62&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cc923b4e66e0c76714f877b33ce9fd5f28e17f62&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3057062" author="jack.mulrow" created="Mon, 27 Apr 2020 17:41:48 +0000"  >&lt;p&gt;Requesting 4.0 backport because&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37929&quot; title=&quot;ShardRegistry in config servers can keep invalid entries after it rolls back until next reload&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37929&quot;&gt;&lt;del&gt;SERVER-37929&lt;/del&gt;&lt;/a&gt; was backported to that branch, which caused the BF this ticket fixed.&lt;/p&gt;</comment>
                            <comment id="2238915" author="xgen-internal-githook" created="Wed, 8 May 2019 18:50:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Saltz&apos;, &apos;username&apos;: &apos;saltzm&apos;, &apos;email&apos;: &apos;matthew.saltz@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39498&quot; title=&quot;ShardRegistry reload inside onReplicationRollback can get stuck&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39498&quot;&gt;&lt;del&gt;SERVER-39498&lt;/del&gt;&lt;/a&gt; Make rollback trigger a lazy (rather than blocking) reload of the ShardRegistry&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d3ee35d6e3ac7a42cd5ad106c3ecb9fb554900c7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d3ee35d6e3ac7a42cd5ad106c3ecb9fb554900c7&lt;/a&gt;&lt;/p&gt;</comment>
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