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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-48151] fix RSM erase in SingleServerIsMasterMonitor and ServerPingMonitor onTopologyChanged method</title>
                <link>https://jira.mongodb.org/browse/SERVER-48151</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;non-deterministic parameter evaluation causes the erased range to be empty. use std::next for the end of the range.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1348671">SERVER-48151</key>
            <summary>fix RSM erase in SingleServerIsMasterMonitor and ServerPingMonitor onTopologyChanged method</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="lamont.nelson@mongodb.com">Lamont Nelson</assignee>
                                    <reporter username="lamont.nelson@mongodb.com">Lamont Nelson</reporter>
                        <labels>
                    </labels>
                <created>Tue, 12 May 2020 17:47:47 +0000</created>
                <updated>Sun, 29 Oct 2023 22:08:19 +0000</updated>
                            <resolved>Mon, 18 May 2020 15:06:16 +0000</resolved>
                                    <version>4.4.0-rc5</version>
                                    <fixVersion>4.4.0-rc7</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3087917" author="xgen-internal-githook" created="Thu, 14 May 2020 19:28:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Lamont Nelson&apos;, &apos;email&apos;: &apos;lamont.nelson@mongodb.com&apos;, &apos;username&apos;: &apos;lamontnelson&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48151&quot; title=&quot;fix RSM erase in SingleServerIsMasterMonitor and ServerPingMonitor onTopologyChanged method&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48151&quot;&gt;&lt;del&gt;SERVER-48151&lt;/del&gt;&lt;/a&gt;: fix unordered_map::erase bug; remove duplicates in rs connection string.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 32ea52bbf377db1bf822276a80cd35af05289239)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/af0b2b1ceaa2e1e291e9ae7d9005892722846bd2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/af0b2b1ceaa2e1e291e9ae7d9005892722846bd2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3084581" author="xgen-internal-githook" created="Wed, 13 May 2020 20:10:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Lamont Nelson&apos;, &apos;email&apos;: &apos;lamont.nelson@mongodb.com&apos;, &apos;username&apos;: &apos;lamontnelson&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48151&quot; title=&quot;fix RSM erase in SingleServerIsMasterMonitor and ServerPingMonitor onTopologyChanged method&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48151&quot;&gt;&lt;del&gt;SERVER-48151&lt;/del&gt;&lt;/a&gt;: fix unordered_map::erase bug; remove duplicates in rs connection string.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/32ea52bbf377db1bf822276a80cd35af05289239&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/32ea52bbf377db1bf822276a80cd35af05289239&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3081989" author="lamont.nelson" created="Tue, 12 May 2020 21:14:22 +0000"  >&lt;p&gt;For future reference, when a server is removed from being monitored the monitor instance for the server is shutdown via a call &lt;a href=&quot;https://github.com/mongodb/mongo/blob/694b92620fe581f57ed78ca9c4c59ece4d5b9a74/src/mongo/client/server_is_master_monitor.cpp#L496&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;, which puts it into a state where no more events will be generated. Since the erase was sometimes wrong due to non-deterministic parameter evaluation order, when the RSM tries to add that server again it sees that there was already an instance there and omits creating a new one. This causes the server never to be re-added to the topology since there are no ismaster replies to process.&lt;/p&gt;

&lt;p&gt;The fix is simple, but since the bug was easy to overlook I kept the invariant checking the removal.&lt;/p&gt;</comment>
                            <comment id="3081933" author="lamont.nelson" created="Tue, 12 May 2020 20:48:28 +0000"  >&lt;p&gt;&lt;a href=&quot;https://mongodbcr.appspot.com/587210005/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodbcr.appspot.com/587210005/&lt;/a&gt;&lt;/p&gt;</comment>
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