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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-22797] Calls to ShardRegistry::reload needs to be serialized</title>
                <link>https://jira.mongodb.org/browse/SERVER-22797</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently it is possible for multiple threads to call reload and we use the $replData lastVisibleOpTime to disregard older data:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.2.0/src/mongo/s/client/shard_registry.cpp#L190-l195&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.2.0/src/mongo/s/client/shard_registry.cpp#L190-l195&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;The problem with this is that lastVisibleOpTime gives you the opTime that is guaranteed to include the data you just read. In other words, it is possible for the lastVisibleOpTime to be way newer than the data you read; which also means that it is possible for the returned shard list that was actually older than the currently stored one to have a newer lastVisibleOpTime and override the shard list. This will cause a momentary &quot;shard not found&quot; error until the next reload.&lt;/p&gt;</description>
                <environment></environment>
        <key id="267291">SERVER-22797</key>
            <summary>Calls to ShardRegistry::reload needs to be serialized</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="9">Done</resolution>
                                        <assignee username="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                            <label>code-only</label>
                    </labels>
                <created>Mon, 22 Feb 2016 21:24:20 +0000</created>
                <updated>Wed, 25 Jan 2017 21:59:13 +0000</updated>
                            <resolved>Thu, 25 Feb 2016 18:24:39 +0000</resolved>
                                    <version>3.3.2</version>
                                    <fixVersion>3.2.4</fixVersion>
                    <fixVersion>3.3.3</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1185084" author="xgen-internal-githook" created="Thu, 25 Feb 2016 20:49:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;renctan&apos;, u&apos;name&apos;: u&apos;Randolph Tan&apos;, u&apos;email&apos;: u&apos;randolph@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22797&quot; title=&quot;Calls to ShardRegistry::reload needs to be serialized&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22797&quot;&gt;&lt;del&gt;SERVER-22797&lt;/del&gt;&lt;/a&gt; Calls to ShardRegistry::reload needs to be serialized&lt;/p&gt;

&lt;p&gt;(cherry picked from commit cf58ea6426f3bfb5dfbc21700c1c46d32a0bbecc)&lt;/p&gt;

&lt;p&gt;Conflicts:&lt;br/&gt;
	src/mongo/s/client/shard_registry.cpp&lt;br/&gt;
Branch: v3.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4c0a65470b7d0efa8104b16e470bf8c6738b17ba&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4c0a65470b7d0efa8104b16e470bf8c6738b17ba&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1183745" author="xgen-internal-githook" created="Wed, 24 Feb 2016 21:44:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;renctan&apos;, u&apos;name&apos;: u&apos;Randolph Tan&apos;, u&apos;email&apos;: u&apos;randolph@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22797&quot; title=&quot;Calls to ShardRegistry::reload needs to be serialized&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22797&quot;&gt;&lt;del&gt;SERVER-22797&lt;/del&gt;&lt;/a&gt; Calls to ShardRegistry::reload needs to be serialized&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cf58ea6426f3bfb5dfbc21700c1c46d32a0bbecc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cf58ea6426f3bfb5dfbc21700c1c46d32a0bbecc&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="244030">SERVER-21911</issuekey>
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            <issuekey id="267283">SERVER-22795</issuekey>
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