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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-6508] Resizing of _nodes and updating _master is not atomic in ReplicaSetMonitor</title>
                <link>https://jira.mongodb.org/browse/SERVER-6508</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;_nodes is the data structure for storing the replica node members of a replica set inside ReplicaSetMonitor and _master is used to store the index that points to the last known primary. The updates done on these two data structure is never atomic and the this is an issue especially when the _nodes shrinks and the _master points to the last element of _nodes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="44713">SERVER-6508</key>
            <summary>Resizing of _nodes and updating _master is not atomic in ReplicaSetMonitor</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="3">Duplicate</resolution>
                                        <assignee username="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                            <label>replicaset</label>
                    </labels>
                <created>Wed, 18 Jul 2012 18:38:37 +0000</created>
                <updated>Wed, 15 Aug 2012 14:04:13 +0000</updated>
                            <resolved>Tue, 24 Jul 2012 22:26:34 +0000</resolved>
                                    <version>2.1.2</version>
                                                    <component>Internal Client</component>
                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="146911" author="renctan" created="Tue, 24 Jul 2012 22:26:34 +0000"  >&lt;p&gt;The issue caused by this non-atomic update is avoided by invalidating the _master node right away when _nodes structure is modified in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6512&quot; title=&quot;ReplicaSetMonitor::_checkConnection does not check upper bounds for the indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6512&quot;&gt;&lt;del&gt;SERVER-6512&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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